const id = expression
A new constant can be introduced by "const" and is evaluated the first time it is encountered in a rule or expression. As in "attr", constant expressions are evaluated only once per generation and rule file. The values of constants cannot be externally changed trough the inspector or by a map. Constant expressions do not appear in the inspector.
Defining a constant with const
const height = 250 // define a constant "height" Lot-->extrude(height) A.
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