Matrix example

example.ts

const result = m4.combine([
   m4.translate(x,y,z),
   m4.rotateX(rads(35)),
   m4.rotateY(rads(25)),
])

// Here's how you can decompose the result back into a vector
const vector = [
   result[6],
   result[7],
   result[8]
];

math.ts

export class m4 {
    static translate(x: number, y: number, z: number) {
        return [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, x, y, z, 1];
    }

    static rotateX(rads: number) {
        const c = Math.cos(rads);
        const s = Math.sin(rads);

        return [1, 0, 0, 0, 0, c, s, 0, 0, -s, c, 0, 0, 0, 0, 1];
    }

    static rotateY(rads: number) {
        const c = Math.cos(rads);
        const s = Math.sin(rads);

        return [c, 0, -s, 0, 0, 1, 0, 0, s, 0, c, 0, 0, 0, 0, 1];
    }

    static rotateZ(rads: number) {
        const c = Math.cos(rads);
        const s = Math.sin(rads);

        return [c, s, 0, 0, -s, c, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1];
    }

    static identity(): number[] {
        return [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1];
    }

    static combine(matrixes: number[][]): number[] {
        let result = matrixes[0];
        for (let i = 1; i < matrixes.length; i++) {
            result = m4.multiply(result, matrixes[i]);
        }
        return result;
    }
}