BREP_kernel 0.5.0

A boundary representation (BREP) geometry kernel for building CAD applications.
Documentation 
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//! Matrix composition shared by STEP import and export.

/// A row-major 4×4 matrix used for STEP assembly placements.
pub type Mat4 = [f64; 16];

pub(crate) const MAT4_IDENTITY: Mat4 = [
    1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0,
];

pub(crate) fn mat4_mul(a: &Mat4, b: &Mat4) -> Mat4 {
    let mut out = [0.0f64; 16];
    for row in 0..4 {
        for col in 0..4 {
            let mut sum = 0.0;
            for k in 0..4 {
                sum += a[row * 4 + k] * b[k * 4 + col];
            }
            out[row * 4 + col] = sum;
        }
    }
    out
}

// BREP private tests: 31738417e5ee3dde