/// <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>
/// Updates the transforms.
/// </summary>
/// <returns>
/// True if the transform was changed.
/// </returns>
public bool UpdateTransforms()
{
var transform = Visual3DHelper.GetViewportTransform(this.visual);
if (!transform.HasValue)
{
return(false);
}
var newTransform = transform.Value;
if (double.IsNaN(newTransform.M11))
{
return(false);
}
if (!newTransform.HasInverse)
{
return(false);
}
if (newTransform == this.visualToScreen)
{
return(false);
}
this.visualToScreen = this.screenToVisual = newTransform;
this.screenToVisual.Invert();
return(true);
}
/// <summary>
/// Gets the distance from the camera for the specified visual.
/// </summary>
/// <param name="c">
/// The visual.
/// </param>
/// <param name="cameraPos">
/// The camera position.
/// </param>
/// <param name="transform">
/// The total transform of the visual.
/// </param>
/// <returns>
/// The camera distance.
/// </returns>
private double GetCameraDistance(Visual3D c, Point3D cameraPos, Transform3D transform)
{
var bounds = Visual3DHelper.FindBounds(c, transform);
switch (this.Method)
{
case SortingMethod.BoundingBoxCenter:
var mid = new Point3D(
bounds.X + bounds.SizeX * 0.5, bounds.Y + bounds.SizeY * 0.5, bounds.Z + bounds.SizeZ * 0.5);
return((mid - cameraPos).LengthSquared);
case SortingMethod.BoundingBoxCorners:
double d = double.MaxValue;
d = Math.Min(d, cameraPos.DistanceTo(new Point3D(bounds.X, bounds.Y, bounds.Z)));
d = Math.Min(d, cameraPos.DistanceTo(new Point3D(bounds.X + bounds.SizeX, bounds.Y, bounds.Z)));
d = Math.Min(
d, cameraPos.DistanceTo(new Point3D(bounds.X + bounds.SizeX, bounds.Y + bounds.SizeY, bounds.Z)));
d = Math.Min(d, cameraPos.DistanceTo(new Point3D(bounds.X, bounds.Y + bounds.SizeY, bounds.Z)));
d = Math.Min(d, cameraPos.DistanceTo(new Point3D(bounds.X, bounds.Y, bounds.Z + bounds.SizeZ)));
d = Math.Min(
d, cameraPos.DistanceTo(new Point3D(bounds.X + bounds.SizeX, bounds.Y, bounds.Z + bounds.SizeZ)));
d = Math.Min(
d,
cameraPos.DistanceTo(
new Point3D(bounds.X + bounds.SizeX, bounds.Y + bounds.SizeY, bounds.Z + bounds.SizeZ)));
d = Math.Min(
d, cameraPos.DistanceTo(new Point3D(bounds.X, bounds.Y + bounds.SizeY, bounds.Z + bounds.SizeZ)));
return(d);
default:
var boundingSphere = BoundingSphere.CreateFromRect3D(bounds);
return(boundingSphere.DistanceFrom(cameraPos));
}
}
/// <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>
/// Updates the clipping object.
/// </summary>
private void UpdateClipping()
{
var vp = Visual3DHelper.GetViewport3D(this);
if (vp == null)
{
return;
}
this.Clipping = new CohenSutherlandClipping(10, vp.ActualWidth - 20, 10, vp.ActualHeight - 20);
}
/// <summary>
/// Zooms to fit the extents of the specified viewport.
/// </summary>
/// <param name="camera">
/// The actual camera.
/// </param>
/// <param name="viewport">
/// The viewport.
/// </param>
/// <param name="animationTime">
/// The animation time.
/// </param>
public static void ZoomExtents(this ProjectionCamera camera, Viewport3D viewport, double animationTime = 0)
{
var bounds = Visual3DHelper.FindBounds(viewport.Children);
var diagonal = new Vector3D(bounds.SizeX, bounds.SizeY, bounds.SizeZ);
if (bounds.IsEmpty || diagonal.LengthSquared < double.Epsilon)
{
return;
}
ZoomExtents(camera, viewport, bounds, animationTime);
}
/// <summary>
/// Applies the cutting planes.
/// </summary>
/// <param name="forceUpdate">
/// if set to <c>true</c> [force update].
/// </param>
private void ApplyCuttingPlanes(bool forceUpdate = false)
{
lock (this)
{
this.NewCutGeometries = new Dictionary <Model3D, Geometry3D>();
this.NewOriginalGeometries = new Dictionary <Model3D, Geometry3D>();
this.forceUpdate = forceUpdate;
Visual3DHelper.Traverse <GeometryModel3D>(this.Children, this.ApplyCuttingPlanesToModel);
this.CutGeometries = this.NewCutGeometries;
this.OriginalGeometries = this.NewOriginalGeometries;
}
}
/// <summary>
/// Invoked when an unhandled <see cref="E:System.Windows.Input.Mouse.MouseDown" /> attached event reaches an element in its route that is derived from this class. Implement this method to add class handling for this event.
/// </summary>
/// <param name="e">The <see cref="T:System.Windows.Input.MouseButtonEventArgs" /> that contains the event data. This event data reports details about the mouse button that was pressed and the handled state.</param>
protected override void OnMouseDown(MouseButtonEventArgs e)
{
base.OnMouseDown(e);
this.ParentViewport = Visual3DHelper.GetViewport3D(this);
this.Camera = this.ParentViewport.Camera as ProjectionCamera;
var projectionCamera = this.Camera;
if (projectionCamera != null)
{
this.HitPlaneNormal = projectionCamera.LookDirection;
}
this.CaptureMouse();
}
/// <summary>
/// Exports the specified viewport.
/// Exports model, camera and lights.
/// </summary>
/// <param name="viewport">
/// The viewport.
/// </param>
public virtual void Export(Viewport3D viewport)
{
this.ExportHeader();
this.ExportViewport(viewport);
// Export objects
Visual3DHelper.Traverse <GeometryModel3D>(viewport.Children, this.ExportModel);
// Export camera
this.ExportCamera(viewport.Camera);
// Export lights
Visual3DHelper.Traverse <Light>(viewport.Children, this.ExportLight);
}
/// <summary>
/// The composition target_ rendering.
/// </summary>
/// <param name="sender">
/// The sender.
/// </param>
/// <param name="e">
/// The event arguments.
/// </param>
protected override void OnCompositionTargetRendering(object sender, RenderingEventArgs e)
{
if (this.isRendering)
{
if (!Visual3DHelper.IsAttachedToViewport3D(this))
{
return;
}
if (this.UpdateTransforms())
{
this.UpdateGeometry();
}
}
}
/// <summary>
/// Exports the specified viewport.
/// Exports model, camera and lights.
/// </summary>
/// <param name="viewport">
/// The viewport.
/// </param>
public override void Export(Viewport3D viewport)
{
this.ExportViewport(viewport);
// Export camera
// Export lights
Visual3DHelper.Traverse <Light>(viewport.Children, this.ExportLight);
this.writer.WriteStartElement("library_materials");
Visual3DHelper.Traverse <GeometryModel3D>(viewport.Children, this.ExportMaterial);
this.writer.WriteEndElement();
this.writer.WriteStartElement("library_effects");
Visual3DHelper.Traverse <GeometryModel3D>(viewport.Children, this.ExportEffect);
this.writer.WriteEndElement();
// writer.WriteStartElement("library_cameras");
// this.ExportCamera(viewport.Camera);
// writer.WriteEndElement();
// writer.WriteStartElement("library_lights");
// Visual3DHelper.Traverse<Light>(viewport.Children, this.ExportLight);
// writer.WriteEndElement();
this.writer.WriteStartElement("library_geometries");
Visual3DHelper.Traverse <GeometryModel3D>(viewport.Children, this.ExportGeometry);
this.writer.WriteEndElement();
this.writer.WriteStartElement("library_nodes");
Visual3DHelper.Traverse <GeometryModel3D>(viewport.Children, this.ExportNode);
this.writer.WriteEndElement();
this.writer.WriteStartElement("library_visual_scenes");
this.writer.WriteStartElement("visual_scene");
this.writer.WriteAttributeString("id", "RootNode");
this.writer.WriteAttributeString("name", "RootNode");
// this.ExportCameraNode(viewport.Camera);
Visual3DHelper.Traverse <GeometryModel3D>(viewport.Children, this.ExportSceneNode);
this.writer.WriteEndElement();
this.writer.WriteEndElement();
this.writer.WriteStartElement("scene");
this.writer.WriteStartElement("instance_visual_scene");
this.writer.WriteAttributeString("url", "#RootNode");
this.writer.WriteEndElement();
this.writer.WriteEndElement();
}
/// <summary>
/// Gets the total number of triangles in the viewport.
/// </summary>
/// <param name="viewport">The viewport.</param>
/// <returns>The total number of triangles</returns>
public static int GetTotalNumberOfTriangles(Viewport3D viewport)
{
int count = 0;
Visual3DHelper.Traverse <GeometryModel3D>(
viewport.Children,
(m, t) =>
{
var geometry = m.Geometry as MeshGeometry3D;
if (geometry != null && geometry.TriangleIndices != null)
{
count += geometry.TriangleIndices.Count / 3;
}
});
return(count);
}
/// <summary>
/// The expand.
/// </summary>
protected virtual void OnExpansionChanged()
{
if (!this.ExpandOrigin.HasValue)
{
if (this.Content != null)
{
this.actualExpandOrigin = this.Content.Bounds.Location;
}
}
else
{
this.actualExpandOrigin = this.ExpandOrigin.Value;
}
Visual3DHelper.TraverseModel <GeometryModel3D>(this.Content, this.Expand);
}
/// <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);
}
}
/// <summary>
/// Exports the specified visual.
/// </summary>
/// <param name="visual">
/// The visual.
/// </param>
public void Export(Visual3D visual)
{
this.ExportHeader();
Visual3DHelper.Traverse <GeometryModel3D>(visual, this.ExportModel);
}
/// <summary>
/// Exports the specified model.
/// </summary>
/// <param name="model">
/// The model.
/// </param>
public void Export(Model3D model)
{
this.ExportHeader();
Visual3DHelper.TraverseModel <GeometryModel3D>(model, this.ExportModel);
}
/// <summary>
/// Gets the distance squared.
/// </summary>
/// <param name="position">
/// The position.
/// </param>
/// <param name="visual">
/// The visual.
/// </param>
/// <returns>
/// The get distance squared.
/// </returns>
public static double GetDistanceSquared(Point3D position, Visual3D visual)
{
var bounds = Visual3DHelper.FindBounds(visual, Transform3D.Identity);
return(Point3D.Subtract(bounds.Location, position).LengthSquared);
}
