# shapes and graphics

##### amigaball ab

**shapes and graphics**

radius (number) | stacks (number) | sectors (number)

none

Creates an ‘Amiga ball’, a sphere that alternates sectors between the pen color and the fill color.

`amigaball 50 10 20`

##### amigaballoid abo

**shapes and graphics**

radius (number) | stacks (number) | sectors (number) | ratio (number)

Creates a stretched or flattened Amiga ball, based on the supplied ratio. Respects setspheroidaxis

amigaballoid 50 10 20 0.5

##### appendtrack

**shapes and graphics**

“turtlea (word) | “turtleb (word)

none

Appends “turtlea’s track (its movements and graphics) to the end of “turtleb’s track. See copytrack

`appendtrack "myrtle "bob`

##### arc

**shapes and graphics**

degrees | radius

none

Creates an arc. The arc is created around the turtle, and the turtle does not move. For arcs the turtle moves along, see leftarc, rightarc

`arc 90 20`

##### backgroundshade

**shapes and graphics**

none

shade (number)

Returns the current background shade value. See setbackgroundshade

`show backgroundshade`

##### begintag

**shapes and graphics**

name (word)

none

Begins a ‘tag’, that is a grouping of movements, turtle parameter changes and shapes present in the calling turtle’s ‘track’, or output. The tag is closed with endtag. These tagged groups can be used for creating turtle models using newmodel, can be hidden or shown using hidetag or showtag, or copied using copytag

`begintag "newtag`

` `

##### billboard

**shapes and graphics**

name (word) | dimensions (list)

none

Creates a ‘billboard’ using the specified image and the specified list of dimensions [x y]. See sample

`billboard "marquee [100 200]`

##### box

**shapes and graphics**

size (number)

none

Creates a lined square of the specified size.

`box 20`

##### circle cir

**shapes and graphics**

radius

none

Creates a lined circle at the specified radius around the turtle

`circle 50`

`repeat 18 [circle 50 rr 10]`

##### clean

**shapes and graphics**

none

none

Erases the ‘turtle track’ (graphics) belonging to the current turtle without changing its position or state. Useful when a turtle is not actually drawing graphics but is itself a graphic element (for example, in a game) to ensure that its movements don’t build up in its track and slow down execution. To use clean in this context, simply place it at the end of the turtle’s “run loop”.

`clean`

##### cleanspace

**shapes and graphics**

none

none

Cleans all turtles in the current space. See clean

`cleanspace`

##### clearimage

**shapes and graphics**

imagename (word)

none

Clears the specified image from memory.

`clearimage "image`

##### clearimages

**shapes and graphics**

none

none

Clears all iamges from memory.

`clearimages`

##### clearmodel

**shapes and graphics**

modelname (word)

none

Removes the specified model from memory.

`clearmodel "model`

##### clearmodels

**shapes and graphics**

none

none

Removes all user-defined models from memory.

`clearmodels`

##### clearplot

**shapes and graphics**

name (word)

none

Clears the named plot. See plot

`clearplot "myplot`

##### clearscreen cs

**shapes and graphics**

none

none

Clears the turtle’s ‘turtle track’ and sends the turtle to its home position.

`clearscreen`

##### clonetag

**shapes and graphics**

sourcetagname (word) | copytagname (word)

none

Clones a turtle’s tag and puts the new copy at the end of its ‘turtle track’. See tag

`clonetag "oldtag "newtag`

##### color

**shapes and graphics**

number

list

color returns the red, green and blue values of the specified color

`show color 5`

`[128 128 128]`

`show color brown`

`[128 80 0]`

##### colors

**shapes and graphics**

none

list

Returns a list of lists containing all of the colors’ RGB values in order of color index, eg with the first list being [0 0 0] (black) and the 16th list being white [255 255 255]. For an easier-to-read version, see listcolors

`show colors`

##### cone cn

**shapes and graphics**

radius (number) | depth (number) | sides (number)

Creates a cone pointing downward from and centered on the calling turtle.

cone 20 10 20

##### coneslice csl

**shapes and graphics**

radius (number) | depth (number) | sidestotal (number) | sidesused (number)

none

Creates a sliced cone.

`coneslice 20 20 20 10`

##### conoid cno

**shapes and graphics**

radius (number) | depth (number) | sides (number) | ratio (number)

Creates a conoid, a cone stretched or compressed based on the provided ratio (1 is normal, 2 is stretched twice as much, 0.5 half as much, etc.)

conoid 20 40 20 2

##### conoidslice cosl

**shapes and graphics**

radius (number) | depth (number) | sidestotal (number) | sidesused (number) | ratio (number)

none

Creates a sliced conoid.

`conoidslice 20 20 20 10 2`

##### copytag

**shapes and graphics**

tag (word) | turtle (word)

none

Copies a tag from the calling turtle to the named turtle, at the end of the named turtle’s turtle track.

`copytag "tag "turtle`

##### copytrack

**shapes and graphics**

“turtlea (word) | “turtleb (word)

none

Copies “turtlea’s track (its movements and graphics) to “turtleb, overwriting “turtleb’s existing track. See appendtrack

`copytrack "myrtle "bob`

##### csall

**shapes and graphics**

none

none

Causes all turtles to clear their turtle tracks and return to their starting positions.

`csall`

##### cube cb

**shapes and graphics**

size

none

Creates a wireframe cube of the specified size

`cube 20`

##### cuboid cbo

**shapes and graphics**

width | height | depth

none

Creates a wireframe cuboid of the specified dimensions

`cuboid 30 20 10`

##### cutcone cc

**shapes and graphics**

radiusnear (number) | radiusfar (number) | depth (number) | sides (number)

none

Creates a truncated, or cut, cone. See cone

`cutcone 10 20 30 30`

##### cutconeslice ccs

**shapes and graphics**

radiusnear (number) | radiusfar (number) | depth (number) | sidestotal (number) | sidesused (number)

none

Creats a cut, sliced cone. See coneslice

`cutconeslice 20 40 20 20 10`

##### cutconoid cco

**shapes and graphics**

radiusnear (number) | radiusfar (number) | depth (number) | sides (number) | ratio (number)

none

Creates a truncated, or cut, conoid, stretched based on the provided ratio. See conoid

`cutconoid 10 20 30 30 2###`

##### cutconoidslice ccos

**shapes and graphics**

radiusnear (number) | radiusfar (number) | depth (number) | sidestotal (number) | sidesused (number) | ratio (number)

none

Creates a cut, sliced conoid, stretched based on the provided ratio. See conoid

`cutconoidslice 10 20 30 30 15 2`

##### cutfunnel cf

**shapes and graphics**

radiusnear (number) | radiusfar (number) | depth (number) | sides (number)

none

Creates a cut funnel (an uncapped cut cone).

`cutfunnel 20 10 20 20`

##### cutfunneloid cfo

**shapes and graphics**

radiusnear (number) | radiusfar (number) | depth (number) | sides (number) | ratio (number)

none

Creates a cut funneloid (an uncapped cut conoid).

`cutfunneloid 20 30 20 20 0.5`

##### cutfunneloidslice cfos

**shapes and graphics**

radiusnear (number) | radiusfar (number) | depth (number) | sidestotal (number) | sidesused (number) | ratio (number)

none

Creates a cut, sliced funneloid (an uncapped cut conoid).

`cutfunneloidslice 20 30 20 20 10 0.5`

##### cutfunnelslice cfs

**shapes and graphics**

radiusnear (number) | radiusfar (number) | depth (number) | sidestotal (number) | sidesused (number)

none

Creates a sliced, cut funnel (an uncapped cut cone).

`cutfunnelslice 20 10 20 20 10`

##### cutsphere csp

**shapes and graphics**

radius (number) | stacks (number) | sectors (number) | minstack (number) | maxstack (number)

none

Creates a truncated, or cut, sphere. Can be cut on the top, bottom, or both based on specified minstack and maxstack values. See sphere

`cutsphere 30 14 32 4 13`

##### cutsphereslice css

**shapes and graphics**

radius (number) | stacks (number) | totalsectors (number) | minstack (number) | maxstack (number) | usedsectors (number)

none

Creates a sliced and cut sphere. Can be cut on the top, bottom, or both based on specified minstack and maxstack values. Displays the portion specified by totalsectors and usedsectors. See sphereslice, cutsphere

`cutsphereslice 30 20 20 5 15 10`

##### cutspheroid cso

**shapes and graphics**

radius (number) | stacks (number) | sectors (number) | minstack (number) | maxstack (number) | ratio (number)

none

Creates a truncated, or cut, sphere, stretched by the provided ratio. Can be cut on the top, bottom, or both based on specified minstack and maxstack values. See spheroid

`cutspheroid 30 14 32 4 13 0.5`

##### cutspheroidslice csos

**shapes and graphics**

radius (number) | stacks (number) | totalsectors (number) | minstack (number) | maxstack (number) | usedsectors (number) | ratio (number)

none

Creates a sliced and cut spheroid. Can be cut on the top, bottom, or both based on specified minstack and maxstack values. Displays the portion specified by totalsectors and usedsectors. Is stretched by the ratio provided. See spheroidslice, cutspheroid

`cutspheroidslice 30 20 20 5 15 10 2`

##### cylinder cy

**shapes and graphics**

radius (number) | depth (number) | sides (number)

none

Creates a cylinder

`cylinder 20 30 10`

##### cylinderarc cya

**shapes and graphics**

thickness (number) | radius (number) | sides (number) | totalsegments (number) | arcsegments (number)

none

Creates a partial torus, or curved cylinder.

`cylinderarc 5 15 20 20 10`

##### cylinderarcslice cyas

**shapes and graphics**

thickness (number) | radius (number) | sides (number) | totalsegments (number) | arcsegments (number) | startsides (number) | endsides (number)

Creates a slice of a partial torus, or curved cylinder. Note: If you invert the thickness value, you can ‘slice’ the opposite side.

cylinderarcslice 5 15 20 20 10 5 15

##### cylinderslice cys

**shapes and graphics**

radius (number) | depth (number) | totalsides (number) | slicesides (number)

none

Creates a rounded wedge shape, like a slice of a round of cheese, starting at the turtle’s right vector and moving counter-clockwise.

`cylinderslice 20 10 20 10`

##### cylindroid cyo

**shapes and graphics**

radius (number) | depth (number) | sides (number) | ratio (number)

none

Creates a cylindoid

`cylindroid 20 30 10 2`

##### cylindroidarc cyoa

**shapes and graphics**

thickness (number) | radius (number) | sides (number) | totalsegments (number) | arcsegments (number) | ratio (number)

none

Creates a cylinder arc extruded by the provided ratio.

`cylindroidarc 5 15 20 20 10 2`

##### cylindroidarcslice cyoas

**shapes and graphics**

thickness (number) | radius (number) | totalsides (number) | totalsegments (number) | arcsegments (number) | startsides (number) | endsides | ratio (number)

none

Creates a cylinder arc sliced by the provided sides values and extruded by the provided ratio.

`cylindroidarcslice 5 15 20 20 10 10 15 2`

##### cylindroidslice cyos

**shapes and graphics**

radius (number) | depth (number) | totalsides (number) | slicesides (number) | ratio (number)

none

Creates a stretched rounded wedge shape, like a slice of a round of cheese, starting at the turtle’s right vector and moving counter-clockwise, and stretched using the provided ratio, where 1 is normal, 0.5 is half, 2 is double etc.

`cylindroidslice 20 10 20 10 0.5`

##### definecolor

**shapes and graphics**

index (number) | list or word

none

definecolor takes an index number from 0 to 63 and either a list of three values (representing red, green, and blue) with a value from 0 to 100, or a 6-character word representing a color’s RGB values in hexadecimal format, for example ab1274. The color palette defined by definecolor is used for pen and fill colors. For text colors see definetextcolor

`definecolor 20 [50 20 90]`

`definecolor 21 "ab1274`

##### deleteoverlay

**shapes and graphics**

name (word)

none

Deletes the named overlay.

`deleteoverlay "myrtlesview`

##### deleteplot

**shapes and graphics**

name (word)

none

Deletes the named plot. See plot

`deleteplot "myplot`

##### deletesticker

**shapes and graphics**

name (word)

none

Deletes the sticker with the specified name. See placesticker.

`deletesticker "marquee`

##### dodecahedron dod

**shapes and graphics**

size (number)

none

Creates a dodecahedron (12-sided shape) of the specified size.

`dodecahedron 5`

##### dodecahedroid dodo

**shapes and graphics**

size (number) | ratio (number)

none

Creates a dodecahedroid (12-sided shape) of the specified size and stretched using the specified ratio.

`dodecahedroid 5 2`

`dodecahedroid 10 0.5 `

##### dome dm

**shapes and graphics**

radius (number) | stacks (number) | sectors (number)

none

Creates a dome

`dome 20 10 10`

##### domoid dmo

**shapes and graphics**

radius (number) | stacks (number) | sectors (number) | stretch (number)

none

Creates a stretched dome.

`domoid 20 10 10 2`

##### doppel

**shapes and graphics**

modelname (word)

none

Like stamp, except creates a reference to the provided model rather than copying the model into the turtle track. This means that if the model changes, its doppel representation will also change.

`doppel "myrtle`

##### dot

**shapes and graphics**

[x y (z)] (list)

none

Puts a dot at the specified co-ordinates using the specified _pen_ color (this is for Apple Logo compatibility). If z is not specified, z = 0. Dots are removed by clean, clearscreen. See dots, dotp, dotsize.

`dot [10 10]`

##### dots

**shapes and graphics**

none

list

Returns a list of the co-ordinates of all the dots currently in the calling turtle’s turtle track. See dot, dotp

`show dots`

##### dotsize

**shapes and graphics**

none

size (number)

Returns the calling turtle’s current dot size. See setdotsize, dot, dotp.

`show dotsize`

##### duocutconoid dcc

**shapes and graphics**

radiusnear (number) | radiusfar (number) | depth (number) | sides (number) | ratio1 (number) | ratio2 (number)

none

Creates a cut conoid with two different oid (stretch) ratios, one for each end. See cutconoid, duocutfunneloid

`duocutconoid 20 30 20 20 0.5 2`

##### duocutfunneloid dcfo

**shapes and graphics**

radiusnear (number) | radiusfar (number) | depth (number) | sides (number) | ratio1 (number) | ratio2 (number)

none

Creates a cut funneloid (an uncapped cut conoid) with two different oid (stretch) ratios, one for each end. See cutfunneloid

`duocutfunneloid 20 30 20 20 0.5 2`

##### duocylindroid dco

**shapes and graphics**

radius (number) | depth (number) | sides (number) | ratio1 (number) | ratio2 (number)

none

Creates a cylindroid with two different oid (stretch) ratios, one for each end. See cylindroid, duotuboid

`duocylindroid 20 20 20 0.5 2`

##### duotuboid dto

**shapes and graphics**

radius (number) | depth (number) | sides (number) | ratio1 (number) | ratio2 (number)

none

Creates a tuboid, or stretched tube, with two different oid (stretch) values, one for each end. Can be used to transition between non-oids and oids, or between two oids. See tuboid

`duotuboid 10 20 20 0.5 2`

##### ellipse ell

**shapes and graphics**

width (number) | height (number)

none

Creates a pen-drawn ellipse of the specified width and height.

`ellipse 50 20`

##### endmark

**shapes and graphics**

none

none

Creates a half-oval “ending” mark. See mark, startmark

`endmark`

##### endrope

**shapes and graphics**

none

none

Creates a dome “end” to a rope. See rope, startrope

`endrope`

##### endtag

**shapes and graphics**

none

none

Closes the currently open tag. See tag

`endtag`

##### erasetag

**shapes and graphics**

tag (word)

none

Erases the named tag and its contents.

`erasetag "mytag`

##### fill

**shapes and graphics**

none

none

Currently does nothing. This is OpenGL not Photoshop!

##### fillcolor

**shapes and graphics**

none

number

Returns the fill color currently used by the selected turtle.

`print myrtle:fillcolor`

`7`

##### fillshade

**shapes and graphics**

none

shade (number)

Returns the current fillshade value. See setfillshade

`show fillshade`

##### fillopacity

**shapes and graphics**

none

opacity (number)

Returns the current fill opacity

`show opacity`

##### fiso

**shapes and graphics**

width height

none

Creates a filled isosceles triangle with the center of its base at the root of the selected turtle and aligned with the turtle’s orientation. See iso.

`fiso 20 10`

##### frag

**shapes and graphics**

none

none

Makes a triangle from the current position and previous two turtle positions.

`forward 20 right 90 forward 20 frag`

##### funnel fu

**shapes and graphics**

radius (number) | depth (number) | sides (number)

Creates a funnel (an uncapped cone).

funnel 20 20 20

##### funnelslice fus

**shapes and graphics**

radius (number) | depth (number) | sidestotal (number) | sidesused (number)

none

Creates a sliced funnel.

`funnelslice 20 20 20 10`

##### funneloid fuo

**shapes and graphics**

radius (number) | depth (number) | sides (number) | ratio (number)

Creates a funneloid (an uncapped conoid).

funneloid 20 20 20 0.5

##### funneloidslice fuos

**shapes and graphics**

radius (number) | depth (number) | sidestotal (number) | sidesused (number) | ratio (number)

none

Creates a sliced funneloid.

`funneloidslice 20 20 20 10 2`

##### gradient

**shapes and graphics**

none

none

Causes lines to graduate in color from the pencolor value to the fillcolor value. nogradient disables it. See gradientp

`cs gradient randpc randfc repeat 36 [fd 100 rt 170]`

##### hideoverlay

**shapes and graphics**

name (word)

none

Hides the specified overlay. See newoverlay

`hideoverlay "myrtlesview`

##### hideplot

**shapes and graphics**

plotname (word)

none

Hides (all) the named plot(s). If you want to show / hide one specific instance of a placed plot (since you can place multiple), place them inside of a tag. See tag, showplot, plot

`hideplot "myplot`

##### hidesticker

**shapes and graphics**

name (word)

none

Hides the sticker specified by the provided name parameter. See placesticker

`hidesticker "marquee`

##### hidetag

**shapes and graphics**

tagname (word)

none

Hides the specified tag from displaying. Be aware that this can alter the display of the rest of the turtle track, as the position of the turtle may be altered by the absence of the tag contents from rendering! To solve this problem, call ‘setposition position’ after calling ‘endtag’ when closing a tag. Then, when you hide the tag, the turtle will still end up in the place it lands when the tag is visible, and the remainder of the turtle track rendering will not be disrupted.

`hidetag "mytag`

##### hidetrack

**shapes and graphics**

none

none

Hides the calling turtle’s ‘turtle track’ or visible output. Make it visible again with showtrack.

`hidetrack`

##### icosphere ico

**shapes and graphics**

radius (number)

none

Creates an icosphere of a specified radius. See icosphereoid

`icosphere 10`

##### icospheroid icd

**shapes and graphics**

radius (number) | multiplier (number)

none

Creates an icosphereoid of a specified radius, stretched using the provided multiplier.

`icosphereoid 10 2`

##### images

**shapes and graphics**

none

list

Returns a list of the currently defined images.

`show images`

##### inscribe

**shapes and graphics**

word, number or list

none

Renders text shapes alongside and to the front of the turtle rather than to the side (as with typeset) using the same size and color as typeset. Unlike typeset, the turtle does not move. See typeset.

`repeat 8 [inscribe se char 32 repcount right 45]`

##### lat

**shapes and graphics**

size

none

Creates a left-facing right-angle triangle. See rat

`lat 20`

##### lightlines

**shapes and graphics**

none

none

Enables lighting for lines. Normally off by default. As lines have no ‘side’, their ‘normal’ (the direction in which light is reflected) needs to be manually set using setlinesnormal. nolightlines disables it.

`lightlines`

##### listcolors

**shapes and graphics**

none

none

Prints out the 64 (0-63) color indexes and their associated RGB values. See colors, showcolors

`listcolors`

##### listoverlays

**shapes and graphics**

none

none

Prints a list of the currently defined overlays.

`listoverlays`

##### listplots

**shapes and graphics**

none

none

Prints a list of the currently defined plots.

`listplots`

##### loadtag

**shapes and graphics**

tagname (word) | tagfile (word)

none

Loads the contents of the specified file into the specified tagname. loadtag creates a new tag at the end of the turtletrack if the tagname does not already exist. See savetag

`loadtag "mytag "tagfile`

##### loadtrack

**shapes and graphics**

filename (word)

none

Loads the saved turtle track, replacing the current turtle track. See savetrack

`loadtrack "turtletrack`

##### mark

**shapes and graphics**

turtle-units (number)

none

Mark moves the turtle forward the specified turtle units, drawing a quad using the ‘marker’ rather than the pen. You can set the diameter of the ‘mark’ using setmarkerwidth

`mark 10`

##### merge

**shapes and graphics**

none

none

Causes the turtle track of a hatchling to merge with its parent at the start of the parents turtle track. The hatchling’s turtle track is empty after the merge. See hatch

`merge`

##### modelscale

**shapes and graphics**

none

scale (number)

Returns the calling turtle’s current modelscale value. Default is 1. See setmodelscale

`show modelscale`

##### newmodel

**shapes and graphics**

name (word) | tagname (word) or [command list] (list)

none

Creates a new model, using either the contents of the specified tag, or the provided list of turtle commands. See setmodel

`newmodel "sphere [icosphere 20]`

`newmodel "fromtag "tag`

##### newoverlay

**shapes and graphics**

name (word) | turtle (word)

none

Creates a new camera ‘overlay’ or picture-in-picture with the specified name using the point of view of the specified turtle. You position the overlay on the screen using placeoverlay

`newoverlay "myrtlesview "myrtle`

##### newplot

**shapes and graphics**

name (word) | dimensions (list)

Defines a new plot (a grid of pixels or voxels) with the provided name, and of the provided dimensions. If the list has two numbers, a two-dimensional plot is created. If the list has three numbers, a three-dimensional plot is created. See placeplot

newplot “myplot [10 20]

`newplot "myplot [5 5 5]`

##### newsticker

**shapes and graphics**

name (word) | image (word)

none

Defines a new sticker using the provided image. See placesticker

`loadimage "marqueeimage "marquee.png`

`newsticker "marqueesticker "marqueeimage`

##### nextframe

**shapes and graphics**

none

none

Waits until the next frame of video is rendered. Useful for creating smooth animations in combination with norender and render (eg render nextframe norender) by otherwise disabling rendering except for one nextframe per loop. Warning: If norender is currently set, nextframe will wait indefinitely!

`render nextframe norender`

##### nolightlines

**shapes and graphics**

none

none

Disables line lighting. See lightlines

`nolightlines`

##### norender

**shapes and graphics**

none

none

Disables the renderer. There will be no updates to the graphical output while norender is enabled. This includes view turtle (camera) movement! Pressing the escape key will re-enable render, as will the render primitive. See render

`norender`

##### nospeckle

**shapes and graphics**

none

none

Disables speckling of voxels and quads. See speckle

`nospeckle`

##### notrack

**shapes and graphics**

none

none

Causes the calling turtle not to generate a track and erases any existing track without changing the turtle’s position, after which any shape and graphics primitives are ignored. See track

`notrack`

##### notrackrender

**shapes and graphics**

none

none

Stops the calling turtle’s ‘track’ render from updating. Its current buffered render will continue to be displayed. This is handy for complex scene creation – you can choose to reveal parts of the scene as they are created. See trackrender, hidetrack, showtrack, render, norender

`notrackrender`

` `

##### notwosided ntws

**shapes and graphics**

none

none

Causes the surface of shapes to only be ‘lit’ from one side – in OpenGL parlance, only one side has ‘normals’. This is the default. If you wish both sides of a shape’s surface to be lit, invoke twosided. See twosided

`notwosided`

##### octahedron oct

**shapes and graphics**

size (number)

none

Creates a octahedron (8-sided shape) of the specified size.

`octahedron 5`

##### octahedroid octo

**shapes and graphics**

size (number) | ratio (number)

none

Creates a octahedroid (8-sided shape) of the specified size and stretched using the specified ratio.

`octahedroid 5 2`

`octahedroid 10 0.5 `

##### oval

**shapes and graphics**

width (number) | height (number)

none

Creates a filled oval of the specified width and height. See ellipse

`oval 50 20`

##### overlays

**shapes and graphics**

none

list

Returns a list of the currently defined overlays.

`show overlays`

##### peak

**shapes and graphics**

width | height | depth

none

Creates a lined wedge around and beneath the calling turtle. The width distance is the distance to one side of the turtle (the total width of the peak is double the provided width value).

`peak 10 20 30`

##### pencolor pc

**shapes and graphics**

none

number

Returns the current pen color.

`show pencolor`

##### pendown pd

**shapes and graphics**

none

none

Puts the calling turtle’s ‘pen’ down (causes it to draw a line when moved).

`pendown`

##### penopacity

**shapes and graphics**

none

number

Returns the calling turtles pen opacity. See setpenopacity

`shoe penopacity`

##### penshade

**shapes and graphics**

none

shade (number)

Returns the current pen shade value. See setpenshade

`show penshade`

##### penup pu

**shapes and graphics**

none

none

Lifts the calling turtle’s pen up, it won’t draw a line when it moves. See pendown

`penup`

##### pie

**shapes and graphics**

degrees (number) | radius (number)

none

Creates a pie-chart like object of the specified radius and degrees, starting at the turtle’s right vector and moving counter-clockwise.

`pie 270 20`

##### pin

**shapes and graphics**

none

none

Drops a ‘pin’, for use with pinfrag and pinshard

`pin`

##### pinfrag

**shapes and graphics**

none

none

Creates a ‘frag’ using the last three dropped ‘pins’. See pin, frag

`pinfrag`

##### pinshard

**shapes and graphics**

none

none

Creates a ‘shard’ using the last three dropped ‘pins’. See pin, shard

`pinshard`

##### placeoverlay

**shapes and graphics**

name (word) | [x1% y1% x2% y2%] (list)

none

Places the named overlay on the screen over the list of co-ordinates which are specified in terms of percentages. See newoverlay

`placeoverlay "myrtlesview [0 0 50 50]`

##### placeplot

**shapes and graphics**

name (word) | voxel / pixel size (list)

none

Places the named plot at the current turtle position using pixels (by providing a list of two) or voxels (by providing a list of three)

`placeplot "myplot [10 10]`

`would place a plot using pixels 10 turtle-units in size, while`

`placeplot "myplot [5 5 5]`

`would place a plot using voxels 5 turtle-units in size`

##### placesticker

**shapes and graphics**

name (word) | [x1% y1% x2% y2%] (list)

none

Places the sticker with the provided name over the area of the screen specified by the provided list, which is in terms of percentages of the screen dimensions, where 100% is the right / bottom and 0% is the left / top. As the name suggests, a sticker is a static image which does not move with the camera view, as if you stuck a sticker to your display. See stickers, stickerp

`loadimage "marquee "marquee.png`

`newsticker "marqueesticker "marquee`

`placesticker "marqueesticker "marquee [25 25 75 75]`

##### plot

**shapes and graphics**

coordinates (list)

none

Plots a pixel / voxel at the specified co-ordinates in the currently selected plot. The list may contain two or three numbers depending on if the plot is two- or three-dimensional. See placeplot

`plot [10 20]`

`plot [10 20 10]`

##### plotcol

**shapes and graphics**

coordinates (list)

number

Returns the color (if any) of the specified pixel / voxel in the currently selected plot. The list of coordinates may contain two or three numbers, depending on if the selected plot is two- or three-dimensional. See plot

`show plotcol [10 20]`

`show plotcol [10 20 10]`

##### plotline

**shapes and graphics**

start co-ordinates (list) | end co-ordinates (list)

none

Plots a line from and including the first set of provided co-ordinates to and including the second set of provided co-ordinates. The co-ordinates may contain two or three numbers dependent on if the plot has two or three dimensions. See plot

`plotline [1 1 1] [5 5 5]`

##### plots

**shapes and graphics**

none

list

Returns a list of the currently defined plots. See newplot, placeplot, plot

`show plots`

##### plottotrack

**shapes and graphics**

plotname (word) | [x y z] list

instructions (list)

Renders the given plot with the voxel size specified in the given list as a series of instructions that can be passed into setmodel to turn a plot directly into a turtle model (with the turtle’s position being the dead center of the plot). Using plottotrack in isolation will cause the turtle to render the plot. See plot

`setmodel “model plottottrack “plot [1 1 1]`

`plottotrack “plot`

##### poly

**shapes and graphics**

radius (number) | sides (number)

none

Draws a convex polygon of the specified radius and number of sides.

`poly 10 6`

##### polyellipse

**shapes and graphics**

width (number) | height (number) | sides (number)

none

Draws a convex polygon of the specified dimensions and sides.

`polyellipse 20 10 10`

##### polyoval

**shapes and graphics**

width (number) | height (number) | sides (number)

none

Creates a filled convex polygon of the specified dimensions and sides.

`polyoval 10 20 5`

##### polyspot ps

**shapes and graphics**

radius (number) | sides (number)

Creates a filled convex polygon of the specified radius and number of sides.

polyspot 20 5

##### prism pri

**shapes and graphics**

width | height | depth

Creates a lined prism to the right, forward and under the turtle.

prism 20 10 30

##### pyramid py

**shapes and graphics**

size (number)

none

Creates a pyramid (5-sided shape) of the specified size.

`pyramid 10`

##### pyramoid pyo

**shapes and graphics**

size (number) | ratio (number)

none

Creates a pyramoid (stretched pyramid) of the specified size and stretch ratio.

`pyramoid 10 2`

##### quad qd

**shapes and graphics**

width | height

Creates a ‘quad’, a two-dimensional filled rectangle of the specified width and height, to the front and right of the turtle.

quad 20 10

##### ramp

**shapes and graphics**

width (number) | height (number) | depth (number)

none

Creates a filled wedge, or ‘ramp’ using the provided dimensions.

`ramp 10 20 30`

##### randomfillcolor randfc rfc

**shapes and graphics**

none

none

Sets a random fill color (1 – 15). See setfillcolor

`randomfillcolor sphere 10`

##### randomfillshade randfs rfs

**shapes and graphics**

none

none

Sets a random fill shade value between -12 and 12. See setfillshade

`randomfillshade`

##### randompencolor randpc rpc

**shapes and graphics**

none

none

Sets a random pen color (1 – 15)

`pendown repeat 10 [randvec randompencolor fd 100 home]`

##### randompenshade randps rps

**shapes and graphics**

none

none

Sets a random pen shade value between -12 and 12. See setpenshade

`randpenshade`

##### rat

**shapes and graphics**

length

none

Creates a filled isosceles right angle triangle with two sides of the same specified length.

`rat 20`

##### rect

**shapes and graphics**

width (number) | height (number)

none

Creates a pen-drawn rectangle of the specified width and height to the front and right of the current turtle.

`rect 10 20`

##### replacetag

**shapes and graphics**

name (word) | list

none

Replaces the contents of the named tag with the contents of the provided list of turtle primitives.

`replacetag "mytag [FD 20 RT 90 FD 20 RT 90]`

##### resetmodel

**shapes and graphics**

none

none

Resets the turtle’s model to its default.

`resetmodel`

##### rhombus

**shapes and graphics**

width (number) | height (number)

none

Creates a 2D rhombus of the specified width and height.

`rhombus 30 10`

##### ring

**shapes and graphics**

thickness (number) | inner radius (number) | segments (number)

none

Creates a two-dimensional ring of the specified thickness, inner radius and segments. A segment number of 4 creates a square picture frame, while 3 creates a triangle. See ringarc

`ring 10 30 10`

##### ringarc

**shapes and graphics**

thickness (number) | inner radius (number) | totalsegments (number) | arcsegments (number)

none

Creates a partial ring of the specified number of segments. So, if the totalsegments specified were 10, an arcsegments value of 5 would create a half-ring.

`ringarc 10 30 10 5`

##### rope rp

**shapes and graphics**

length (number)

none

Draws a ‘rope’, a cylinder of the specified length, and places the turtle at its end, similar to mark or forward. You can set the diameter of the rope with setropewidth, and the number of sides the rope has using setropesides. See ropesides, ropewidth

`rope 10`

##### ropesides

**shapes and graphics**

none

number

Returns the number of sides of the cylinder drawn by rope. See setropesides

`show ropesides`

##### ropewidth

**shapes and graphics**

none

number

Returns the current width or radius of the rope. See setropewidth

`show ropewidth`

##### sample

**shapes and graphics**

image (word) | position (list)

RGBA (list)

Sample returns a list of the RGBA values of the pixel at the specified position (given in terms of percentages, measured from the bottom-left corner of the image) in the specified loaded image. For example, sample “frog [50 50] will return the color of the pixel located at 50% of frog’s height, and 50% of frog’s width. Sample can be used to determine the color of a pixel underneath a turtle, for example, by doing a bit of funky math.

`show sample "frog [50 50]`

##### saveimage

**shapes and graphics**

image | filename

none

Saves an internally stored image. Useful for saving internally created or modified images.

`saveimage "myimage "imagefile`

##### savemodel

**shapes and graphics**

modelname (word) | modelfile (word)

none

Saves the specified model name into the specified model file. See loadmodel

`savemodel "mymodel "modelfile.mdl`

##### savetag

**shapes and graphics**

tagname (word) | tagfile (word)

none

Saves the contents of the specified tag to the specified filename. See loadtag

`savetag "mytag "tagfile`

##### savetrack

**shapes and graphics**

filename

none

Saves the calling turtle’s ‘turtle track’ to a file.

`savetrack`

##### selectplot

**shapes and graphics**

name (word)

none

Selects the named plot for use with plot, unplot, plotcol. See plot

`selectplot "myplot`

##### setdotsize

**shapes and graphics**

size (number)

none

Sets the calling turtle’s dot size. All of a turtle’s dots are of the same size, but different turtles can have different-sized dots. See dotsize, dot, dotp.

`setdotsize 5`

##### setfillcolor setfc sfc

shapes and graphics

color (number)

none

`Sets the 'fill' color used by the turtle when creating shapes.`

`setfillcolor 3`

`setfillcolor blue`

##### setfillshade setfs sfs

**shapes and graphics**

shade (number)

none

Sets the shade of the fill color to be displayed when rendering subsequent shapes. It can be set to a number from 0 to 15, which represents a decrease in brightness of the fill color of 6.25 times that number. So, a value of 8 decreases the brightness by 50%. Negative shade values add 1/16th of the difference between each of the base RGB values of the color and 255

`setfillshade 5`

##### setfillopacity setfo

**shapes and graphics**

opacity (number)

none

Sets the fill opacity, takes a number from 0 to 100.

`setfillopacity 50`

##### seticosphereiterations sisi

**shapes and graphics**

number

none

Sets the complexity of the icosphere, from 0 to 3

`seticosphereiterations 3`

##### setlinesnormal

**shapes and graphics**

vector (list)

none

Sets the ‘normal’ vector to be used by lightlines. All lines use the same vector. This is easiest taken from a turtle. Remember that if you take the forwarddir from Snappy, you will need to reverse it, using vectorsub! See lightlines

`setlinesnormal vectorsub snappy:forwarddir [0 0 0]`

##### setmarkerwidth smw

**shapes and graphics**

radius (number)

none

Sets the width of the mark primitive. The default is 2. See mark

`setmarkerwidth 10`

##### setoverlayresolution

**shapes and graphics**

name (word) | ratio (number)

none

Sets the resolution or pixel density of the named overlay, based on a ratio where 1 is 512 pixels by 384 pixels (at a 16:9 ratio)

`setoverlayresolution "myrtlesview 2`

##### setoverlaytransparency

**shapes and graphics**

name (word) | boolean

none

Turns on background transparency for the specified overlay. If transparency is off, the background color in the overlay view is solid.

`setoverlaytransparency "myrtlesview on`

##### setoverlayupdate

**shapes and graphics**

name (word) | frames per second (number)

none

Sets the update frequency of the named overlay to the provided number of frames per second. See newoverlay

`setoverlayupdate "myrtlesview 10`

##### setpencolor setpc spc

**shapes and graphics**

color (number)

none

Sets the pen color to the provided color index. Note that there are a number of color functions that return their corresponding numbers, such as yellow and blue, that can be used in place of a number. See colors

`setpencolor yellow`

`setpc 13`

##### setpenshade setps sps

**shapes and graphics**

shade (number)

none

Sets the shade of the pen color to be displayed when rendering subsequent lines. It can be set to a number from 0 to 15, which represents a decrease in brightness of the pen color of 6.25 times that number. So, a value of 8 decreases the brightness by 50%.

`setpenshade 5`

##### setropesides

**shapes and graphics**

sides (number)

none

Sets the number of sides of the cylinder created by the rope primitive. The default is 10. See rope, ropesides

`setropesides 3`

##### setropewidth

**shapes and graphics**

number

none

Sets the circumference of the ‘rope’. See rope, ropewidth, ropesides

##### setspecklecolors

**shapes and graphics**

list

none

Takes a list of colors to be used in the generation of speckle patterns. If you want to weight a random speckle towards a particular color, simply include it more than once in the request, such as the example below.

`setspecklecolors [1 1 1 1 2 2 3]`

`setspecklecolors {:col1 :col1 :col2}`

##### setspeckleplot

**shapes and graphics**

plotname (word)

none

Selects the name of the plot to use to generate a speckle, if using the plot style with speckle.

`setspeckleplot "myplot`

##### setspecklesize

**shapes and graphics**

turtleSteps

none

Sets the pixel size used in generating speckles, in turtleSteps.

`setspecklesize 1`

##### setspecklestyle

**shapes and graphics**

“styletype

none

Selects the style to use when generating speckles. You can choose from “repeat “dither “random or “plot.

`setspecklestyle "random`

##### setspheroidaxis ssa

**shapes and graphics**

boolean

none

Sets the axis by which spheroids are stretched. 0 is equatorial while 1 is polar. See spheroidaxis

`setspheroidaxis 1`

##### settypedelay stde

**shapes and graphics**

60ths-of-a-second (number)

none

Sets a delay between the rendering of each letter rendered by ‘typeset’. This delay is specified in 60ths of a second – 60 equalling one second. See typeset

`settypedelay 60`

##### settypedepth std

**shapes and graphics**

turtle-units (number)

none

Sets the depth of three-dimensional type created by ‘typeset’. See typeset

`settypedepth 3`

##### settypefont stf

**shapes and graphics**

font-id (number)

none

Sets the font used for ‘typeset’. Default is 1. See settextfont

`settypefont 1`

##### settypefilled stfi

**shapes and graphics**

boolean

none

If set true (default), typeset and inscribe create ‘filled’ characters. If false, they create lined cube characters.

`settypefilled false`

##### settypesize sts

**shapes and graphics**

size (number)

none

Sets the size (in turtle units) of the font used by typeset and inscribe. See typeset

`settypesize 10`

##### settypestretch str

**shapes and graphics**

ratio

none

Stetches text rendered using typeset or inscribe by the specified ratio.

`settypestretch 2`

##### setview sv

**shapes and graphics**

turtle (word)

none

Sets the current “view turtle” – the turtle from whose viewpoint the display is generated.

`setview "myrtle`

##### setviewfar

**shapes and graphics**

distance (number)

none

Sets the far clipping plane, the distance at which OpenGL objects stop being rendered or are clipped. This must be set by the view turtle. See setviewnear

`setviewfar 1000`

##### setviewfov

**shapes and graphics**

angle (number)

none

Sets the turtle’s viewing angle, the angle of view displayed in the window. The default is 60

`setviewfov 60`

##### setviewnear

**shapes and graphics**

distance (number)

none

Sets the near clipping plane. OpenGL objects closer than this distance are not rendered or are clipped. This must be set by the view turtle. See setviewfar

##### setviewpoint

**shapes and graphics**

list

none

Positions the view by the provided [X (left-right) Y (down-up) Z (back-forward)] list of turtle units, where a negative value has the first effect and a positive value has the second effect.

`setviewpoint [10 -10 0]`

##### setviewvectors

**shapes and graphics**

vectors (list)

none

Sets arbitrary view vectors for the current turtle. When selected as a view (camera) turtle, if viewvectors are set the display will always be rendered in the direction and orientation specified by those vectors, regardless of the turtle’s orientation. To return to using the turtle’s orientation, specify an empty list, eg: setviewvectors []

`setviewvectors vectors`

##### setzoom

**shapes and graphics**

percentage (number)

none

Sets the view turtle’s camera ‘zoom’ – the default is 100%

`setzoom 50`

##### shard

**shapes and graphics**

depth (number)

none

Creates a ‘shard’ or a three-dimensional fragment using the current and two previous turtle positions with a depth specified by its input parameter.

`shard 10`

##### showoverlay

**shapes and graphics**

name (word)

none

Shows the specified overlay. See newoverlay

`showoverlay "myrtlesview`

##### showplot

**shapes and graphics**

plotname (word)

none

Shows (all) the named plot(s). If you want to show / hide one specific instance of a placed plot (since you can place multiple), place them inside of a tag. See tag, hideplot, plot

`showplot "myplot`

##### showsticker

**shapes and graphics**

name (word)

none

Shows the sticker with the provided name. See placesticker

`show "marquee`

##### showtag

**shapes and graphics**

tag (word)

none

Shows (makes visible) the specified tag. See tag

`showtag "mytag`

##### showtrack

**shapes and graphics**

none

none

Shows the calling turtles ‘turtle track’ or visible output. See hidetrack

`showtrack`

##### skewfiso skf

**shapes and graphics**

width (turtle-units) | height | degrees

none

Creates a filled isosceles triangle “skewed” by the given number of degrees in the X axis. Negative degree values are an acceptable input. See fiso

`skewfiso 50 100 45`

##### skewiso ski

**shapes and graphics**

width (turtle-units) | height | degrees

none

Creates an isosceles triangle “skewed” by the given number of degrees in the X axis. Negative degree values are an acceptable input. See iso

`skewiso 50 100 45`

##### skewpyramid skp

**shapes and graphics**

size (turtle-units) | degrees X | degrees Z

none

Creates a pyramid “skewed” by the specified number of degrees in the X and Z directions.

`skewpyramid 50 45 45`

##### skewpyramoid skpo

**shapes and graphics**

size (turtle-units) | stretch (ratio) | degrees X | degrees Z

none

Creates a pyramid “skewed” by the specified number of degrees in the X and Z directions, and stretched by the specified ratio

`skewpyramoid 50 3 45 45`

##### skewquad skq

**shapes and graphics **

width (turtle-units) | height (turtle-units) | degrees

none

Creates a quad “skewed” by the specified number of degrees, a value which can be negative. See quad

`skewquad 50 50 45`

##### skewrect skr

**shapes and graphics**

width (turtle-units) | height | degrees

none

Creates a “skewed” rectangle of the given width and height, skewed by the specified number of degrees, a value which can be negative.

`skewrect 100 50 -45`

##### skewtraperect sktr

**shapes and graphics**

width (turtle-units) | height | ratio | degrees

none

Creates a “skewed” trapezoidal rectangle of the specified width and height, whose top is affected by the provided ratio and who is skewed by the specified number of degrees, a value which can be negative. See rect

`skewtraperect 100 100 0.5 45`

##### skewtrapevoxeloid skvo

**shapes and graphics**

width | height | depth | ratio-W | ratio-D | degrees X | degrees Z

none

Creates a skewed trapezoidal voxel, the width and depth of whose “top” or side in front of the turtle is stretched or contracted by the given ratios (depth and width), and who is then skewed by the given degree values in the X and Z axis, which can be negative. See trapevoxeloid

`skewtrapevoxeloid 50 50 50 0.5 2 45 45`

##### skewtrapezoid skt

**shapes and graphics**

width (turtle-units) | height | ratio | degrees

none

Creates a skewed trapezoidal quad of the specified width and height, whose top is affected by the provided ratio and who is skewed by the specified number of degrees, a value which can be negative.

`skewtrapezoid 100 100 0.5 45`

##### skewvoxeloid skv

**shapes and graphics**

width (turtle-units) | height | depth | degrees X | degrees Z

none

Creates a “skewed” voxeloid of the specified dimensions, distorted on the X and Z axis by the specified number of degrees, which can be negative.

`skewvoxeloid 100 100 100 45 45`

##### speckle

**shapes and graphics**

none

none

Enables ‘speckling’ (generated pixelated texturing) of any following square, quad, voxel and voxeloid shapes. These are configured using setspecklestyle (repeat, random or plot), setspecklecolors, setspecklesize and optionally setspeckleplot. nospeckle disables speckling

`speckle`

##### specklecolors

**shapes and graphics**

none

list

Returns the currently defined speckle colors. See speckle

`show specklecolors`

##### specklesize

**shaoes and graphics**

none

number

Returns the currently defined speckle size. See setspecklesize, speckle

`show specklesize`

##### speckleplot

**shapes and graphics**

none

word

Returns the plot currently used by speckle in the plot style. See setspecklestyle

`show speckleplot`

##### specklestyle

**shapes and graphics**

none

word

Returns the current speckle style. See speckle

`show specklestyle`

`"random`

##### sphere sph

**shapes and graphics**

radius (number) | stacks (number) | sectors (number)

none

Creates a sphere of the specified radius using the specified number of stacks and the specified number of sectors. Small stack and sector values create interesting shapes. As opposed to icosphere

`sphere 20 10 10`

##### sphereslice sphs

**shapes and graphics**

radius (number) | stacks (number) | sectorstotal (number) | sectorsused (number)

none

Creates a partial sphere of the overall specified radius, using the specified number of vertical ‘stacks’, and specified number of horizontal ‘sectors’, based on the given total number of sectors, and the used (displayed) number of sectors. Like an orange cut vertically. See cutsphere, cutsphereslice

`sphereslice 20 10 10 5`

##### spheroid spd

**shapes and graphics**

radius (number) | stacks (number) | sectors (number) | multiplier (number)

none

Creates an spheroid of a specified radius, stacks and sectors, stretched using the provided multiplier.

`sphereoid 20 10 10 2`

##### spheroidaxis

**shapes and graphics**

none

boolean

Returns the current spheroid axis, the axis along which spheroids are stretched. 0 is equatorial and 1 is polar.

`show spheroidaxis`

##### spheroidslice spds

**shapes and graphics**

radius (number) | stacks (number) | sectorstotal (number) | sectorsused (number) | multiplier (number)

none

Creates a partial spheroid of the overall specified radius, using the specified number of vertical ‘stacks’, and specified number of horizontal ‘sectors’, based on the given total number of sectors, and the used (displayed) number of sectors, and stretched using the provided multiplier. Like a squashed orange cut vertically. See cutspheroid, cutspheroidslice

`spheroidslice 20 10 10 5 2`

##### spot sp

**shapes and graphics**

radius (number)

none

Creates a filled circle of the specified radius.

`spot 50`

##### square sq

**shapes and graphics**

size (number)

none

Creates a filled square of the specified size.

`square 20`

##### stamp

**shapes and graphics**

modelname (word)

none

‘Stamps’ a copy of the specified model at the current location using the current model scale.

`cs pu repeat 20 [setmodelscale repcount / 10 stamp "plane fd 3 * repcount]`

##### startmark

**shapes and graphics**

none

none

Creates a half-oval “starting” mark. See mark, endmark

`startmark`

##### startrope

**shapes and graphics**

none

none

Creates a half-dome starting “cap” to a rope. See rope, endrope

`startrope`

##### stickers

**shapes and graphics**

none

list

Returns the currently defined stickers. See newsticker

`show stickers`

##### switchtag

**shapes and graphics**

tag1 (word) | tag2 (word)

none

Hides tag1 and shows tag2, like flipping a switch. See tag

`switchtag "tag1 "tag2`

##### tag

**shapes and graphics**

name (word)

list

Returns the contents of a tag, as a list of turtle primitives. See begintag

`show tag "mytag`

##### tags

**shapes and graphics**

none

list

Returns a list of the current turtle’s defined tags.

`show tags`

##### tent

**shapes and graphics**

half-width (number) | height (number) | depth (number)

none

Creates an opaque (solid) prism to the left, right and front of the turtle.

`tent 10 10 5 `

##### tetrahedron th

**shapes and graphics**

size (number)

none

Creates a tetrahedron (4-sided shape) of the specified size.

`tetrahedron 5`

##### tetrahedroid tho

**shapes and graphics**

size (number) | ratio (number)

none

Creates a tetrahedroid (4-sided shape) of the specified size and stretched using the specified ratio.

`tetrahedroid 5 2`

`tetrahedroid 10 0.5 `

##### toroid tro

**shapes and graphics**

thickness (number) | radius (number) | sides (number) | segments (number) | ratio (number)

none

Creates a torusoid, an extruded three-dimensional ring, stretched by a ratio where 1 is a normal torus.

`torus 10 30 4 16 0.5`

##### toroidslice tros

**shapes and graphics**

thickness (number) | radius (number) | sides (number) | totalsegments (number) | startsides (number) | endsides (number) | ratio

none

Creates a ‘slice’ of a torus, based on the startsides and endsides value. Note that using a negative thickness value inverts the slice.

`toroidslice 5 15 20 20 10 15 2`

`toroidslice -5 15 20 20 10 15 2`

##### torusslice trs

**shapes and graphics**

thickness (number) | radius (number) | sides (number) | totalsegments (number) | startsides (number) | endsides (number)

none

Creates a ‘slice’ of a torus, based on the startsides and endsides value. Note that using a negative thickness value inverts the slice.

`torusslice 5 15 20 20 10 15`

`torusslice -5 15 20 20 10 15`

##### torus tr

**shapes and graphics**

thickness (number) | radius (number) | sides (number) | segments (number)

none

Creates a torus, also known as a rhombus or a donut, a three-dimensional ring. Sides and segments can be as low as 3.

`torus 10 30 4 16`

##### track

**shapes and graphics**

none

none

Allows the calling turtle’s track to be created. See notrack

`track`

##### trackcount

**shapes and graphics**

none

number

Returns the number of items in the current turtle’s track.

`show trackcount`

##### trackitem

**shapes and graphics**

number

list

Returns the number last track item in the selected turtle’s track, where 1 returns the latest track entry

`show trackitem 1`

##### tracklist

**shapes and graphics**

number

list

Returns the last number latest track items in forward chronological order, the first being the oldest and the last being the newest and most recent.

`show tracklist 5`

##### trackrender

**shapes and graphics**

none

none

Causes the calling turtle’s ‘track’ to be rendered (updated) by the graphics renderer from the point it is called onwards. See notrackrender

`trackrender`

` `

##### traperect tre

**shapes and graphics**

width (turtle-units) | height | ratio

none

Creates a trapezoidal rectangle of the given width, height and with its far end contracted or expanded by the given ratio. See rect

`traperect 50 50 2`

##### trapevoxeloid tvo

**shapes and graphics**

width (turtle-units) | height | depth | ratio-W | ratio-D

none

Creates a trapezoidal voxel, whose far ‘end’ is affected by the given width and depth ratios.

`trapevoxeloid 50 50 50 0.5 2`

##### trapezoid tz

**shapes and graphics**

width (turtle-units) | height | ratio

none

Creates a quad whose far ‘end’ is expanded or contracted based on the provided ratio. See quad, skewtrapezoid

`trapezoid 100 50 5`

##### triangle tri

**shapes and graphics**

width (number) | height (number)

none

Creates a wireframe (pen-drawn) right-angle triangle to the front and right of the turtle.

`triangle 10 20`

##### tube tb

**shapes and graphics**

radius (number) | depth (number) | sides (number)

none

Creates a hollow tube.

`tube 10 20 20`

##### tubearc tba

**shapes and graphics**

thickness (number) | radius (number) | sides (number) | totalsegments (number) | arcsegments (number)

none

Creates a tube arc.

`tubearc 5 15 20 20 10`

##### tuboidarc tboa

**shapes and graphics**

thickness (number) | radius (number) | sides (number) | totalsegments (number) | arcsegments (number) | ratio (number)

none

Creates a tube arcoid (extruded based on the provided ratio).

`tuboidarc 5 15 20 20 10 2`

##### tubearcslice tbas

**shapes and graphics**

thickness (number) | radius (number) | sides (number) | totalsegments (number) | arcsegments (number) | startsides (number) | endsides (number)

Creates a slice of a partial tube. Note: If you invert the thickness value, you can ‘slice’ the opposite side.

tubearcslice 5 15 20 20 10 5 15

##### tubeslice tbs

**shapes and graphics**

radius (number) | depth (number) | sidestotal (number) | sidesused (number)

none

Creates a ‘slice’ of a tube, based on the sidestotal and sidesused values.

`tubeslice 20 20 10 4`

##### tuboid tbo

**shapes and graphics**

radius (number) | depth (number) | sides (number) | ratio (number)

none

Creates a tuboid, or stretched tube.

`tuboid 10 20 20 0.5`

##### tuboidarc tboa

**shapes and graphics**

thickness (number) | radius (number) | sides (number) | totalsegments (number) | arcsegments (number) | ratio (number)

none

Creates a tube arc extruded by the provided ratio.

`tuboidarc 5 15 20 20 10 2`

##### tuboidarcslice tboas

**shapes and graphics**

thickness (number) | radius (number) | totalsides (number) | totalsegments (number) | arcsegments (number) | startsides (number) | endsides | ratio (number)

none

Creates a tube arc sliced by the provided sides values and extruded by the provided ratio.

`tuboidarcslice 5 15 20 20 10 10 15 2`

##### tuboidslice tbos

**shapes and graphics**

radius (number) | depth (number) | sidestotal (number) | sidesused (number) | ratio (number)

none

Creates a stretched ‘slice’ of a tube, based on the sidestotal and sidesused values, and the stretching ratio (normal is 1, half is 0.5, double is 2 etc.)

`tuboidslice 10 20 20 10 0.5`

`tuboidslice 10 20 20 10 2`

##### twosided tws

**shapes and graphics**

none

none

Lights both sides of the surface of a shape. Useful for shapes where both sides of the surface are visible. The default is that they are unlit. Whether to use twosided or not is a purely stylistic choice in most cases. See notwosided, which turns twosided off.

`twosided`

##### typeset

**shapes and graphics**

word or [list]

Typeset renders the provided word or list as three-dimensional text to the right of the turtle one character at a time, moving the turtle to the right as it does so.

typeset [Welcome to turtlespaces!]

`typeset {[Happy New Year] year [!]}`

##### typedepth

**shapes and graphics**

none

depth (number)

Returns the current depth of text rendered using typeset. See typeset

`show typedepth`

##### typefont

**shapes and graphics**

none

font (number)

Returns the index of the font used by typeset. See typeset

`show typefont`

##### typesize

**shapes and graphics**

none

size (number)

Returns the size of the text rendered by typeset. See typeset.

`show typesize`

##### typestretch

**shapes and graphics**

none

size (number)

Returns the ratio by which text rendered by typeset will be stretched. See typeset.

`show typestretch`

##### unplot

**shapes and graphics**

co-ordinates [list]

none

‘Unplots’ or removes the pixel / voxel from the selected plot at the provided co-ordinates. The list of coordinates may contain two or three numbers, depending on if the selected plot is two- or three-dimensional. See plot

`unplot [10 10]`

`unplot [20 10 10]`

##### viewfar

**shapes and graphics**

none

turtle-units (number)

Returns the value of the far clipping plane. See setviewfar

`show viewfar`

##### viewfov

**shapes and graphics**

none

angle (number)

Returns the current viewing angle, or field of view. See setviewfov

`show viewfov`

##### viewnear

**shapes and graphics**

none

turtle-units (number)

Returns the current near clipping plane. See setviewnear

`show viewnear`

##### viewvectors

**shapes and graphics**

none

list

Returns the calling turtle’s view vectors. See setviewvectors

`show viewvectors`

##### voxel vx

**shapes and graphics**

turtle-steps

none

Creates a filled cube turtle-steps wide, high and deep to the right, forward and down of the turtle.

`voxel 20`

##### voxeloid vxo

**shapes and graphics**

turtle-steps-right turtle-steps-forward turtle-steps-deep

none

Creates a filled cuboid to the right, forward and down of the turtle.

`voxeloid 10 20 30`

##### wedge

**shapes and graphics**

turtle-steps-right turtle-steps-forward

Creates a filled right-angle triangle turtle-steps-right from the turtle and turtle-steps-forward from the turtle in dimensions.

wedge 20 4