frameBounds static method

RenderView frameBounds(Aabb3 box, int width, int height, { Vector3? toward, double yaw = -0.6, double pitch = -0.45, })

A view of box, width by height, far enough back to see all of it: from toward (a direction from its middle to the eye), or — when that is null — turned yaw and tipped pitch (radians).

Implementation

static RenderView frameBounds(
  Aabb3 box,
  int width,
  int height, {
  Vector3? toward,
  double yaw = -0.6,
  double pitch = -0.45,
}) {
  final centre = Vector3.zero();
  box.centerInto(centre);
  final radius = math.max(0.05, box.min.distanceTo(box.max) / 2);
  const fov = math.pi / 4;
  final distance = radius / math.sin(fov / 2) * 1.05;
  final towardEye =
      toward ??
      Vector3(
        -math.cos(pitch) * math.sin(yaw),
        math.sin(pitch),
        -math.cos(pitch) * math.cos(yaw),
      );
  towardEye.normalize();
  final eye = centre + towardEye * distance;
  final view = RenderView()
    ..width = width
    ..height = height;
  view.lookAt(eye, centre);
  view.projection.setPerspectiveYDown(
    fov,
    width / height,
    math.max(0.01, distance - radius * 2),
    distance + radius * 2,
  );
  return view;
}