accessing a transformed texture's pixel data

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Hello everyone

How do i access the TRANSFORMED pixel data for a texture, after it has been transformed by D3DXMatrixTransformation2D() and texture->SetTransform()?

I'm trying to do 2D pixel perfect collision detection and it's impossible if you can only access the untransformed pixel data using texture->LockRect().

Anybody got any ideas?

Posted 29-Jun-11 4:19am

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AndreFratelli 2-Jul-11 2:06am

I don't really know D3D, only OpenGL. But still, why would you need to access the texture's data to detect collisions? I recently wrote a collision detection system, and I think you are taking the wrong approach here. Have you considered other options to "pixel" collision detection? Bound-boxes, Octrees, Triangle-triangle collisions..

Anyway, whenever you want something transformed, you better transform it in CPU (assuming you are not transforming ** everything ** in a mesh, instead of just whatever needs to be checked).

regards

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KarstenK · Answer 1 · 2011-07-15T03:14:00

Solution 1

paint it on a memory dc and do GetPixel()

Posted 15-Jul-11 3:14am

KarstenK