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[.net] Managed DX and Cg

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I'm having problems with using more than 1 device with Cg at the same time, I have a form with 2 panels (different sizes) each rendering a different view of a 3d object. The GUI is c# and the Cg calls are managed c++, in theory I just call cgD3D9SetDevice with the device I want before I draw to it, but I get the 2 views drawing either the same thing or the wrong one for that panel on and off. From what I can see cgD3D9SetDevice must not take instant effect when its called, as i've tried locking resources so that the 2 panels definetly cant paint at the same time. I'm not really sure whats going on behind the cgD3D9SetDevice call or how to fix this problem, anyone?

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