renderTree method

Implementation

@override
void renderTree(Canvas canvas) {
  final camera = CameraComponent3D.currentCamera;
  assert(
    camera != null,
    '''Component is either not part of a World3D or the render is being called outside of the camera rendering''',
  );

  // If ancestor is inside, so are we, otherwise test.
  final cullResult = _ancestorFullyInside
      ? CullResult.inside
      : aabb.frustumCullTest(camera!.frustum);

  // Result is fully outside, skip children and self.
  if (cullResult == CullResult.outside) {
    world.culled++;
    return;
  }

  // Render children. If fully inside, children can skip frustum tests.
  final wasAncestorFullyInside = _ancestorFullyInside;
  if (cullResult == CullResult.inside) {
    _ancestorFullyInside = true;
  }
  super.renderTree(canvas);
  _ancestorFullyInside = wasAncestorFullyInside;

  if (cullResult == CullResult.inside || shouldCull(camera!)) {
    // We set the priority to the distance between the camera and the object.
    // This ensures that our rendering is done in a specific order allowing
    // for alpha blending.
    //
    // Note(wolfenrain): we should optimize this in the long run it currently
    // sucks.
    priority = -(CameraComponent3D.currentCamera!.position - position).length
        .abs()
        .toInt();

    bind(world.device);
  } else {
    world.culled++;
  }
}