set operation

Syntax

set(attribute, value)

Parameters

attribute (selector)
Name of shape attribute to set.
value (bool, float, string, bool[], float[], string[] - same type as attribute)
Value to assign to shape attribute. Note: Not all shape attributes are writable!

Description

The set operation assigns a value to a shape attribute of the current shape. There are two kinds of shape attributes: builtin attributes such as material.color or scope.tx and generic attributes, which are declared as rule attributes (see CGA attributes).

Examples

Builtin Shape Attributes

Enable horizontal trim planes	set(trim.horizontal, true)
Set x-translation of scope to 0	set(scope.tx, 0)
Set the material color's red component to 0.5	set(material.color.r, 0.5)
Assign the built-in test texture to the colormap channel	set(material.colormap, "builtin:uvtest.png")

Generic Shape Attributes

attr floorNumber = -1
const floorHeight = 4

Init --> extrude(30)
         comp(f) {side : Side }	

Side --> split(y) { ~floorHeight : Floor }*

Floor --> 
    set(floorNumber, split.index)
    split(x) { ~1 : Wall |  {~3 : Tile}* | ~1 : Wall } 

Tile --> 
    split(x) { 0.5 : Wall | ~1 : MidTile | 0.5 : Wall}

MidTile--> 
    split(y) { 0.5 : Wall | ~1 : Window | 0.5 : Wall }

Window --> 
    case floorNumber % 3 == 0 : color(1.0, 0.0, 1.0) X.
    else : X.

Store floor index in a generic attribute, floorHeight. The attribute is then used to color the windows on every 3rd floor in pink.