applyMatrix4 method
Implementation
Box3 applyMatrix4(Matrix4 matrix) {
// transform of empty box is an empty box.
if (isEmpty()) return this;
// NOTE: I am using a binary pattern to specify all 2^3 combinations below
_points[0].set(min.x, min.y, min.z).applyMatrix4(matrix); // 000
_points[1].set(min.x, min.y, max.z).applyMatrix4(matrix); // 001
_points[2].set(min.x, max.y, min.z).applyMatrix4(matrix); // 010
_points[3].set(min.x, max.y, max.z).applyMatrix4(matrix); // 011
_points[4].set(max.x, min.y, min.z).applyMatrix4(matrix); // 100
_points[5].set(max.x, min.y, max.z).applyMatrix4(matrix); // 101
_points[6].set(max.x, max.y, min.z).applyMatrix4(matrix); // 110
_points[7].set(max.x, max.y, max.z).applyMatrix4(matrix); // 111
setFromPoints(_points);
return this;
}