Oh, so you want the final image to stay in GPU RAM? I thought you wanted it in CPU RAM. Well, I guess that rules out the screenshot idea, too bad. But yes, a DS graph would be necessary in any case. I have to admit that my source code currently isn't in the best shape. There is a lot of code in the DS event routines atm. I plan to cleanup my code after I've reached v1.0 in madVR. If my code were cleaner, it would probably be easier for me to offer you a rendering API without DS. But with the current state of my source code it would be hard to achieve without a DS framework.
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