Hittesting in 3D

I am struggling with Hit-Testing in 3D and being no coding-wizard just staring at unannoted MSDN entries doesn't get me any farther :(
All the samples I found seem to use Methods and Classes that became obsolote with the September CTP.

So far, I managed to have my application react when an object withint the viewport is clicked. To do so, I use the following MouseButtonDown event handler ...

private void Window_Click(object sender, MouseButtonEventArgs e)
{
Point p = e.GetPosition(viewport);
VisualOperations.HitTest(viewport, null, new HitTestResultDelegate(ResultsOfHit), new PointHitTestParameters(p));
}

... which triggers the following delegate method ...

private HitTestResultBehavior ResultsOfHit(HitTestResult hitTestResult)
{

}

Where do I go from here That is,

a. how do I find out which of my Model3DGroups was affected by the click
b. how do I find out which of my Geometry3DModel(s) was affected by the click

(I have no problems doing this by using the ray and check its intersection with the Bounding-Boxes of my 3D objects - just as I would do it in openGL or directX if I wanted to do it 'by hand' - but I am under the impression that the MPF offers a more conventient way to do this)

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Hittesting in 3D

sinan m al dabagh

Taking a better look at the class hierarchy finally enabled me to answer my own question. Just in case anybody else is facing the same 'problem', here the solution:

HitTestResult is (amongst other classes) inherited by Ray3DHitTestResult ... so all I had to do was to typecasst the HitTestResult to Ray3DHitTestResult ... hence

private HitTestResultBehavior ResultsOfHit(HitTestResult hitTestResult)
{
Model3D modelHit = (hitTestResult as Ray3DHitTestResult).ModelHit;
return HitTestResultBehavior.Continue; // or .Stop ... depending on what you want to do
}

Hittesting in 3D

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