How to get 3D Hitpoint from a 3D rayHittested mesh with WPF?

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Hello
I would like to define a 3D point and a 3D vector, then shoot a ray from that point and get back a 3D point with the coordonate of a mesh point hit by this ray.

I can do hittesting but only with 2D points (generaly coresponding to the mouse position), but i cannot find a way to do it with 3D points.

If any body as a hint, it would be gladly appreciated.
Thanks

Posted 16-Sep-15 23:37pm

Laurent Chougrani

Updated 16-Sep-15 23:58pm

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Kenneth Haugland 17-Sep-15 6:09am

So, Ray tracing?

Laurent Chougrani 17-Sep-15 7:36am

Yes I've looked into it, but can't find a proper way to do so with 3D points.

Kenneth Haugland 17-Sep-15 20:05pm

https://www.google.no/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=distance%20between%20a%20point%20and%20plane

Kenneth Haugland 17-Sep-15 20:06pm

Its what you'll need to calculate. IIRC this is usually done using determinant of a matrix.

Laurent Chougrani 18-Sep-15 2:30am

that's not what i want, distance from a point to a plane is calculate throught the normal. I need to return the triangle or point that was hit by the ray no matter the orientation of the surface... I'm sure there is a way embeded in WPF or helixtoolkit.

Kenneth Haugland 18-Sep-15 16:22pm

No, the WPF 3D engine uses matrices not ray tracing. So it is what you want...

Laurent Chougrani 19-Sep-15 9:02am

Would you know where I can find some code exemples?

Kenneth Haugland 20-Sep-15 6:05am

Just do a search for ray tracing, I have seen examples here on this site of that.

Laurent Chougrani 20-Sep-15 6:35am

Allright, Thanks a lot for your time.

Kenneth Haugland 20-Sep-15 14:47pm

Hmmm been thinking a bit, and I think that I#m wrong here.

Look here:
http://blogs.msdn.com/b/wpf3d/archive/2009/05/18/3d-hit-testing.aspx

Laurent Chougrani 21-Nov-16 8:23am

Hi Kenneth, it's been a while since I have watch my account, I finally managed to get it up and running. I created a Class that get the Visual Hittested object and can return the hit mesh and hitpoints.
Thanks for your time and help

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How to get 3D Hitpoint from a 3D rayHittested mesh with WPF?

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