private BoundingVolume BuildFrustumFromViewport(Viewport3DHitTestHelper.ViewportInformation viewport, List <Point> frustumOutline)
{
List <Ray3D> list1 = new List <Ray3D>(frustumOutline.Count);
Point point1 = new Point(0.0, 0.0);
for (int index = 0; index < frustumOutline.Count; ++index)
{
list1.Add(CameraRayHelpers.RayFromViewportPoint(viewport.Bounds, viewport.Camera, frustumOutline[index]));
point1 += (Vector)frustumOutline[index];
}
Point point2 = (Point)Vector.Divide((Vector)point1, (double)frustumOutline.Count);
Point3D point3D = new Point3D(0.0, 0.0, 0.0);
List <Plane3D> list2 = new List <Plane3D>();
for (int index = 0; index < frustumOutline.Count; ++index)
{
Vector3D normal = Vector3D.AngleBetween(list1[index].Direction, list1[(index + 1) % frustumOutline.Count].Direction) <= 0.0001 ? Vector3D.CrossProduct(list1[index].Direction, list1[(index + 1) % frustumOutline.Count].Origin - list1[index].Origin) : Vector3D.CrossProduct(list1[index].Direction, list1[(index + 1) % frustumOutline.Count].Direction);
normal.Normalize();
list2.Add(new Plane3D(normal, list1[index].Origin));
point3D += (Vector3D)list1[index].Origin;
}
bool flag = list2[0].GetSignedDistanceFromPoint(list1[2].Origin) < 0.0;
BoundingVolume boundingVolume = new BoundingVolume();
for (int index = 0; index < frustumOutline.Count; ++index)
{
Plane3D frustumSide = list2[index];
if (flag)
{
Vector3D normal = frustumSide.Normal;
normal.Negate();
frustumSide = new Plane3D(normal, list1[index].Origin);
}
boundingVolume.AddSide(frustumSide);
}
Ray3D ray3D = CameraRayHelpers.RayFromViewportPoint(viewport.Bounds, viewport.Camera, point2);
this.frustumCenterRay = new Ray3D((Point3D)Vector3D.Divide((Vector3D)point3D, (double)frustumOutline.Count), ray3D.Direction);
ProjectionCamera projectionCamera = viewport.Camera as ProjectionCamera;
if (projectionCamera != null)
{
boundingVolume.NearFrustum = new Plane3D(ray3D.Direction, this.frustumCenterRay.Origin);
if (!double.IsPositiveInfinity(projectionCamera.FarPlaneDistance))
{
Vector3D direction = ray3D.Direction;
direction.Negate();
boundingVolume.FarFrustum = new Plane3D(direction, this.frustumCenterRay.Origin + (projectionCamera.FarPlaneDistance - projectionCamera.NearPlaneDistance) * ray3D.Direction);
}
}
return(boundingVolume);
}
public ViewportInformation(Viewport3D viewport, GeneralTransform transform)
{
this = new Viewport3DHitTestHelper.ViewportInformation(viewport.Children, viewport.Camera, new Size(viewport.ActualWidth, viewport.ActualHeight), transform);
}