write variable from inside shader for outside use

Question

From inside the shader I can't modify uniforms or attributes. Is there a way I could write a variable that I can use outside the shader?

My goal is to determine the lowest and the highest vertex on the z-axis. I could of course run through all the vertices in a for loop, but the shader runs through them anyway and is faster.

bjorke · Accepted Answer · 2013-02-12 10:15:27Z

2

Not really. The shader's output, always, is pixels. Anything other than that would violate the stream-processing nature of the GPU. You could read the result pixel values...

answered Feb 12, 2013 at 10:15

bjorke

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