Macro cube 

macro_rules! cube {
    ([$x:expr, $y:expr, $z:expr], $center:expr) => { ... };
    ([$x:expr, $y:expr, $z:expr]) => { ... };
    ($size:expr, $center:expr) => { ... };
    ($size:expr) => { ... };
}

Create a cube.

#params

size: The size of a side of the cube.

center: Whether to center the cube or leave in the first octant.

[x, y, z]: The dimensions of the cube.

expansion: Scad struct literal.

#patterns

cube!(‘size: f64’);

cube!(‘size: f64’, ‘center: bool’);

cube!([‘x: f64’, ‘y: f64’, ‘z: f64’]);

cube!([‘x: f64’, ‘y: f64’, ‘z: f64’], ‘center: bool’);