public Frustum.Intersect Intersects(Cube cube)
{
Frustum.Intersect result = Frustum.Intersect.Inside;
foreach (Plane plane in _Planes)
{
if (plane.Distance(cube.GreaterSumVertex(plane.Normal)) < 0f)
{
return(Frustum.Intersect.Outside);
}
else if (plane.Distance(cube.LesserSumVertex(plane.Normal)) < 0f)
{
result = Frustum.Intersect.Intersect;
}
}
return(result);
}
public Frustum.Intersect Intersects(Sphere sphere)
{
Frustum.Intersect result = Frustum.Intersect.Inside;
foreach (Plane plane in _Planes)
{
float distance = plane.Distance(sphere.Center);
if (distance < -sphere.Radius)
{
return(Frustum.Intersect.Outside);
}
else if (distance < sphere.Radius)
{
result = Frustum.Intersect.Intersect;
}
}
return(result);
}
private static bool CheckClipFrustumOccludeEntity(Entity entity, Span <Plane> planes, Matrix4x4 mvp)
{
if (!_ENABLE_FRUSTUM_CULLING || !entity.TryComponent(out OcclusionBounds? bounds))
{
return(false);
}
ClipFrustum frustum = new ClipFrustum(planes, mvp);
Frustum.Intersect intersection = Frustum.Intersect.Outside;
return
// test spherical bounds
(((bounds.Spheric != Sphere.Zero) && (intersection = frustum.Intersects(bounds.Spheric)) is Frustum.Intersect.Outside)
// if spherical bounds occlusion fails (i.e. intersects) try cubic
|| (intersection is not Frustum.Intersect.Inside &&
(bounds.Cubic != Cube.Zero) &&
frustum.Intersects(bounds.Cubic) is Frustum.Intersect.Outside));
}