On Jan 24, 2008 4:22 PM, Gordon Erlebacher <[EMAIL PROTECTED]> wrote:
> Steve, > > First I thought it worked on Linux, but it does not. The two viewports > were superimposed and device 0 was on top. When you draw to two > separate viewports (at different positions in the window, the final > image does does appear). If I understand you correctly, this is normal behaviour. If you obscure an OpenGL window and then read back it's frame buffer, you'll get undefined data. On X11 this is most of the time garbage, and on OS X most of the time valid data, due to the way the window systems are implemented. When you move the two windows side-by-side, they both should show content - one because it is rendering (channel1), and one because it's receiving pixels (channel3). Is that the case? Cheers, Stefan. Cheers, Stefan.
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