WebCAD/src/Common/Matrix4Utils.ts

import { Matrix4, Vector3 } from 'three';

export function matrixSetVector(mat: Matrix4, col: number, v: Vector3)
{
    let index = col * 4;
    mat.elements[index] = v.x;
    mat.elements[index + 1] = v.y;
    mat.elements[index + 2] = v.z;
}