/// <summary>
/// Gets the transform to viewport space.
/// </summary>
/// <param name="visual">
/// The visual.
/// </param>
/// <returns>
/// A transformation matrix.
/// </returns>
public static Matrix3D GetViewportTransform(Visual3D visual)
{
var totalTransform = Matrix3D.Identity;
DependencyObject obj = visual;
while (obj != null)
{
var viewport3DVisual = obj as Viewport3DVisual;
if (viewport3DVisual != null)
{
var viewportTotalTransform = Viewport3DHelper.GetTotalTransform(viewport3DVisual);
totalTransform.Append(viewportTotalTransform);
return totalTransform;
}
var mv = obj as ModelVisual3D;
if (mv != null)
{
if (mv.Transform != null)
{
totalTransform.Append(mv.Transform.Value);
}
}
obj = VisualTreeHelper.GetParent(obj);
}
throw new InvalidOperationException("The visual is not added to a Viewport3D.");
// At this point, we know obj is Viewport3DVisual
}
/// <summary>
/// Get the ray into the view volume given by the position in 2D (screen coordinates)
/// </summary>
/// <param name="position"></param>
/// <returns></returns>
public Ray3D GetRay(Point position)
{
Point3D point1, point2;
bool ok = Viewport3DHelper.Point2DtoPoint3D(Viewport, position, out point1, out point2);
if (!ok)
{
return(null);
}
return(new Ray3D {
Origin = point1, Direction = point2 - point1
});
}
/// <summary>
/// Calculate the screen position of a 3D point
/// </summary>
/// <param name="p"></param>
/// <returns></returns>
public Point Project(Point3D p)
{
return(Viewport3DHelper.Point3DtoPoint2D(Viewport, p));
}
/// <summary>
/// Finds the nearest visual.
/// </summary>
/// <param name="pt">
/// The pt.
/// </param>
/// <returns>
/// A visual.
/// </returns>
public Visual3D FindNearestVisual(Point pt)
{
return(Viewport3DHelper.FindNearestVisual(this.Viewport, pt));
}
/// <summary>
/// Finds the nearest point.
/// </summary>
/// <param name="pt">
/// The pt.
/// </param>
/// <returns>
/// A point.
/// </returns>
public Point3D?FindNearestPoint(Point pt)
{
return(Viewport3DHelper.FindNearestPoint(this.Viewport, pt));
}
/// <summary>
/// Finds the nearest object.
/// </summary>
/// <param name="pt">
/// The pt.
/// </param>
/// <param name="pos">
/// The pos.
/// </param>
/// <param name="normal">
/// The normal.
/// </param>
/// <param name="obj">
/// The obj.
/// </param>
/// <returns>
/// The find nearest.
/// </returns>
public bool FindNearest(Point pt, out Point3D pos, out Vector3D normal, out DependencyObject obj)
{
return(Viewport3DHelper.FindNearest(this.Viewport, pt, out pos, out normal, out obj));
}
/// <summary>
/// Copies the view to the clipboard.
/// </summary>
public void Copy()
{
Viewport3DHelper.Copy(
this.Viewport, this.Viewport.ActualWidth * 2, this.Viewport.ActualHeight * 2, Brushes.White);
}
