nanogl-node/math.js

handle objects transform in 3D space

import { mat3, quat } from "gl-matrix";
const M3 = mat3.create();
export function decomposeMat4(m4, p, q, s) {
    p[0] = m4[12];
    p[1] = m4[13];
    p[2] = m4[14];
    s[0] = Math.sqrt(m4[0] * m4[0] + m4[1] * m4[1] + m4[2] * m4[2]);
    s[1] = Math.sqrt(m4[4] * m4[4] + m4[5] * m4[5] + m4[6] * m4[6]);
    s[2] = Math.sqrt(m4[8] * m4[8] + m4[9] * m4[9] + m4[10] * m4[10]);
    M3[0] = m4[0] / s[0];
    M3[1] = m4[1] / s[0];
    M3[2] = m4[2] / s[0];
    M3[3] = m4[4] / s[1];
    M3[4] = m4[5] / s[1];
    M3[5] = m4[6] / s[1];
    M3[6] = m4[8] / s[2];
    M3[7] = m4[9] / s[2];
    M3[8] = m4[10] / s[2];
    quat.fromMat3(q, M3);
}