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Index › Programming Questions & Help › OpenGL and 3D Libraries › OpenGL, Stacked .png transparency problem
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OpenGL, Stacked .png transparency problem (Read 1125 times)
mrr
OpenGL, Stacked .png transparency problem
Jul 20th, 2007, 7:48pm  
I'm displaying a fair amount of PImages, loaded from .png with transparency, in a rapidly changing 3d environment.

The overlap between the images is sometimes drawn correctly, and sometimes the transparent areas are acting as a mask for the images which overlap?

Should I be drawing them in Z depth order? I don't *seem* to be getting any better results that way?

Thank you!
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JohnG
Re: OpenGL, Stacked .png transparency problem
Reply #1 - Jul 20th, 2007, 8:42pm  
Taht sounds exactly like a depth sorting issue. You have to draw them in the order of furthest from camera, to closest to camera.

(Note that the "z" position may not relate to closeness to camera.. if you're doing rotates and transforms z isn't necessarily "away")
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mrr
Re: OpenGL, Stacked .png transparency problem
Reply #2 - Jul 23rd, 2007, 12:32pm  
Great, thank you muchly!
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