@phaserjs/phaser/math/mat4/Mat4TargetTo.js

Phaser 4

import { Matrix4 } from "./Matrix4";
export function Mat4TargetTo(eye, target, up, out = new Matrix4()) {
  const { x: eyex, y: eyey, z: eyez } = eye;
  const { x: upx, y: upy, z: upz } = up;
  const { x: targetx, y: targety, z: targetz } = target;
  let z0 = eyex - targetx;
  let z1 = eyey - targety;
  let z2 = eyez - targetz;
  let len = z0 * z0 + z1 * z1 + z2 * z2;
  if (len > 0) {
    len = 1 / Math.sqrt(len);
    z0 *= len;
    z1 *= len;
    z2 *= len;
  }
  let x0 = upy * z2 - upz * z1;
  let x1 = upz * z0 - upx * z2;
  let x2 = upx * z1 - upy * z0;
  len = x0 * x0 + x1 * x1 + x2 * x2;
  if (len > 0) {
    len = 1 / Math.sqrt(len);
    x0 *= len;
    x1 *= len;
    x2 *= len;
  }
  return out.set(x0, x1, x2, 0, z1 * x2 - z2 * x1, z2 * x0 - z0 * x2, z0 * x1 - z1 * x0, 0, z0, z1, z2, 0, eyex, eyey, eyez, 1);
}