Cómo: Hacer una prueba de posicionamiento en Viewport3D
En este ejemplo se muestra cómo realizar la prueba de posicionamiento en los objetos visuales 3D en Viewport3D.
Dado que HitTest devuelve información 2D y 3D, es posible recorrer en iteración los resultados de la prueba para leer únicamente los resultados 3D.
Public Sub HitTest(ByVal sender As Object, ByVal args As MouseButtonEventArgs)
Dim mouseposition As Point = args.GetPosition(myViewport)
Dim testpoint3D As New Point3D(mouseposition.X, mouseposition.Y, 0)
Dim testdirection As New Vector3D(mouseposition.X, mouseposition.Y, 10)
Dim pointparams As New PointHitTestParameters(mouseposition)
Dim rayparams As New RayHitTestParameters(testpoint3D, testdirection)
'test for a result in the Viewport3D
VisualTreeHelper.HitTest(myViewport, Nothing, AddressOf HTResult, pointparams)
public void HitTest(object sender, System.Windows.Input.MouseButtonEventArgs args)
{
Point mouseposition = args.GetPosition(myViewport);
Point3D testpoint3D = new Point3D(mouseposition.X, mouseposition.Y, 0);
Vector3D testdirection = new Vector3D(mouseposition.X, mouseposition.Y, 10);
PointHitTestParameters pointparams = new PointHitTestParameters(mouseposition);
RayHitTestParameters rayparams = new RayHitTestParameters(testpoint3D, testdirection);
//test for a result in the Viewport3D
VisualTreeHelper.HitTest(myViewport, null, HTResult, pointparams);
El comportamiento de prueba de posicionamiento (HitTestResultBehavior) del código siguiente determina cómo se procesan los resultados de la prueba de posicionamiento. UpdateResultInfo y UpdateMaterial son métodos definidos localmente.
Public Function HTResult(ByVal rawresult As HitTestResult) As HitTestResultBehavior
Dim rayResult As RayHitTestResult = TryCast(rawresult, RayHitTestResult)
If rayResult IsNot Nothing Then
Dim rayMeshResult As RayMeshGeometry3DHitTestResult = TryCast(rayResult, RayMeshGeometry3DHitTestResult)
If rayMeshResult IsNot Nothing Then
Dim hitgeo As GeometryModel3D = TryCast(rayMeshResult.ModelHit, GeometryModel3D)
UpdateResultInfo(rayMeshResult)
UpdateMaterial(hitgeo, (TryCast(side1GeometryModel3D.Material, MaterialGroup)))
End If
End If
Return HitTestResultBehavior.Continue
End Function
public HitTestResultBehavior HTResult(System.Windows.Media.HitTestResult rawresult)
{
//MessageBox.Show(rawresult.ToString());
RayHitTestResult rayResult = rawresult as RayHitTestResult;
if (rayResult != null)
{
RayMeshGeometry3DHitTestResult rayMeshResult = rayResult as RayMeshGeometry3DHitTestResult;
if (rayMeshResult != null)
{
GeometryModel3D hitgeo = rayMeshResult.ModelHit as GeometryModel3D;
UpdateResultInfo(rayMeshResult);
UpdateMaterial(hitgeo, (side1GeometryModel3D.Material as MaterialGroup));
}
}
return HitTestResultBehavior.Continue;
}