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Parameter Passing

JSCAD designs can pass parameters from one function to another, just like in the example. This is because JSCAD designs are really JavaScript.

There are a few special parameters which are important to understand.

Passing Options

JSCAD tries to maintain a consistent and easy to use set of functions (API). Although most functions require specific options, most have defaults and do not need to be supplied. Every function has predefined defaults, even shapes (The defaults are shown along side of examples for each function.)

Options are passed as attributes of another object. In most cases, the options are assigned a value, and bracketed with ‘{…}’.

  cylinder({start: [0,0,0], end: [0,0,10], r1: 1, r2: 2, fn: 50})

Why the strange syntax? There can be lots parameters, default parameters can be skipped, order is not important, etc. This provides a lot of flexibility when creating complex designs.

Passing Vectors

When 3D vectors are required, parameters can be passed as an array. If a scalar (single value) is passed for a parameter which expects a 3D vector, the scalar is used for the x, y and z values. In other words: radius: 1 will give radius: [1,1,1].