Function sim3dToMatrix4

src/utils/sim3dTransforms.ts:287–299

(sim3d: Sim3d)

 * The matrix can be applied to a Three.js group to transform all children.
 */
export function sim3dToMatrix4(sim3d: Sim3d): THREE.Matrix4 {
  const matrix = new THREE.Matrix4();

  // Compose: translation * rotation * scale
  // THREE.Matrix4.compose(position, quaternion, scale)
  matrix.compose(
    sim3d.translation,
    sim3d.rotation,
    new THREE.Vector3(sim3d.scale, sim3d.scale, sim3d.scale)
  );

  return matrix;
}

/**
 * Check if a Sim3dEuler represents an identity transform.