@jscad/modeling
Version:
Constructive Solid Geometry (CSG) Library for JSCAD
33 lines (29 loc) • 766 B
JavaScript
/**
* Create a matrix for mirroring about the given plane.
*
* @param {mat4} out - receiving matrix
* @param {vec4} plane - plane of which to mirror the matrix
* @returns {mat4} out
* @alias module:modeling/maths/mat4.mirrorByPlane
*/
const mirrorByPlane = (out, plane) => {
const [nx, ny, nz, w] = plane
out[0] = (1.0 - 2.0 * nx * nx)
out[1] = (-2.0 * ny * nx)
out[2] = (-2.0 * nz * nx)
out[3] = 0
out[4] = (-2.0 * nx * ny)
out[5] = (1.0 - 2.0 * ny * ny)
out[6] = (-2.0 * nz * ny)
out[7] = 0
out[8] = (-2.0 * nx * nz)
out[9] = (-2.0 * ny * nz)
out[10] = (1.0 - 2.0 * nz * nz)
out[11] = 0
out[12] = (2.0 * nx * w)
out[13] = (2.0 * ny * w)
out[14] = (2.0 * nz * w)
out[15] = 1
return out
}
module.exports = mirrorByPlane