/// <summary>
/// Transforms from local to world coordinates.
/// </summary>
/// <param name="vector">
/// The vector (local coordinates).
/// </param>
/// <returns>
/// Transformed vector (world coordinates).
/// </returns>
protected Vector3D ToWorld(Vector3D vector)
{
var mat = Visual3DHelper.GetTransform(this);
var t = new MatrixTransform3D(mat);
return(t.Transform(vector));
}
/// <summary>
/// Transforms from local to world coordinates.
/// </summary>
/// <param name="point">
/// The point (local coordinates).
/// </param>
/// <returns>
/// Transformed point (world coordinates).
/// </returns>
protected Point3D ToWorld(Point3D point)
{
var mat = Visual3DHelper.GetTransform(this);
var t = new MatrixTransform3D(mat);
return(t.Transform(point));
}
/// <summary>
/// The sort children.
/// </summary>
private void SortChildren()
{
var vp = Visual3DHelper.GetViewport3D(this);
if (vp == null)
{
return;
}
var cam = vp.Camera as ProjectionCamera;
if (cam == null)
{
return;
}
var cameraPos = cam.Position;
var transform = new MatrixTransform3D(Visual3DHelper.GetTransform(this));
IList <Visual3D> transparentChildren = new List <Visual3D>();
IList <Visual3D> opaqueChildren = new List <Visual3D>();
if (this.CheckForOpaqueVisuals)
{
foreach (var child in this.Children)
{
if (this.IsVisualTransparent(child))
{
transparentChildren.Add(child);
}
else
{
opaqueChildren.Add(child);
}
}
}
else
{
transparentChildren = this.Children;
}
// sort the children by distance from camera (note that OrderBy is a stable sort algorithm)
var sortedTransparentChildren =
transparentChildren.OrderBy(item => - this.GetCameraDistance(item, cameraPos, transform)).ToList();
this.Children.Clear();
// add the opaque children
foreach (var c in opaqueChildren)
{
this.Children.Add(c);
}
// add the sorted transparent children
foreach (var c in sortedTransparentChildren)
{
this.Children.Add(c);
}
}
/// <summary>
/// Transforms from world to local coordinates.
/// </summary>
/// <param name="worldPoint">
/// The point (world coordinates).
/// </param>
/// <returns>
/// Transformed vector (local coordinates).
/// </returns>
protected Point3D ToLocal(Point3D worldPoint)
{
var mat = Visual3DHelper.GetTransform(this);
mat.Invert();
var t = new MatrixTransform3D(mat);
return(t.Transform(worldPoint));
}
/// <summary>
/// The sort children.
/// </summary>
private void SortChildren()
{
var vp = Visual3DHelper.GetViewport3D(this);
if (vp == null)
{
return;
}
var cam = vp.Camera as ProjectionCamera;
if (cam == null)
{
return;
}
var cameraPos = cam.Position;
var transform = new MatrixTransform3D(Visual3DHelper.GetTransform(this));
IList <Visual3D> transparentChildren = new List <Visual3D>();
IList <Visual3D> opaqueChildren = new List <Visual3D>();
if (this.CheckForOpaqueVisuals)
{
foreach (var child in this.Children)
{
if (this.IsVisualTransparent(child))
{
transparentChildren.Add(child);
}
else
{
opaqueChildren.Add(child);
}
}
}
else
{
transparentChildren = this.Children;
}
// sort the children by distance from camera (note that OrderBy is a stable sort algorithm)
var sortedTransparentChildren =
transparentChildren.OrderBy(item => - this.GetCameraDistance(item, cameraPos, transform)).ToList();
// Now that opaqueChildren and sortedTransparentChildren describe our desired ordering, we need sort the current children in the new order.
// To optimize the efficiency of this procedure we want to change the children list as little as possible.
// Unfortunatally the Visual3DCollection does not have a swap method and we always need to remove an item before we can add it again as
// temporary duplicates result in exceptions in the visual tree.
// Due to this set of considerations we use selection sort to sort the current Children. (if we could swap without removal, cycle sort might be a small improvement)
for (int desiredIndex = 0; desiredIndex < opaqueChildren.Count; desiredIndex++)
{
Visual3D currentChild = opaqueChildren[desiredIndex];
int currentIndex = Children.IndexOf(currentChild);
//Insert in the proper spot if not contained:
if (currentIndex == -1)
{
Children.Insert(desiredIndex, currentChild);
continue;
}
//Do nothing if it is in the correct spot;
//The order of the opaque children does not matter as long as they are before the transparent children:
if (currentIndex < opaqueChildren.Count)
{
continue;
}
//remove from old spot and insert to the new correct spot:
Children.RemoveAt(currentIndex);
Children.Insert(desiredIndex, currentChild);
}
for (int desiredIndex = opaqueChildren.Count; desiredIndex < opaqueChildren.Count + sortedTransparentChildren.Count; desiredIndex++)
{
Visual3D currentChild = sortedTransparentChildren[desiredIndex - opaqueChildren.Count];
int currentIndex = Children.IndexOf(currentChild);
//Insert in the proper spot if not contained:
if (currentIndex == -1)
{
Children.Insert(desiredIndex, currentChild);
continue;
}
//Do nothing if it is in the correct spot:
if (currentIndex == desiredIndex)
{
continue;
}
//remove from old spot and insert to the new correct spot:
Children.RemoveAt(currentIndex);
Children.Insert(desiredIndex, currentChild);
}
}
