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D3DXIntersect with moving objects problem

Started by Raeldor Aug 30, 2003 at 11:33 AM 2 replies 300+ views

Original Post

Aug 30, 2003 at 11:33 AM

Hi all, I am testing for collision detection using the D3DXIntersect function, but cannot get it working properly. Does anyone know if this function takes into account the current world matrix setting? If not, does this mean I have to translate my mesh (or my intersection ray?) by the scaling/position/rotation that I would normally apply before rendering the object? Thanks Rael

VolkerG

Aug 30, 2003 at 12:18 PM

I wouldn''t transform the mesh, but the ray by the inverse transform matrix.

Raeldor

Aug 30, 2003 at 12:57 PM

Thanks for your reply, but still no luck yet. I am passing in the near and far points of the ray, then doing a matrix invert on the matrix that I use to position/scale/rotate the mesh. I am then transforming the near and far points of the ray by this inverted matrix, then calculating the direction from near-far. I then use the inverted near point, and the new direction vector to check the intersection of the mesh.

Does this sound right? Am I missing something?

Thanks

Rael

Raeldor

Aug 30, 2003 at 1:37 PM

My bad, I was deducting near from far instead of far from near... it works!!! yea!

Thank you!

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