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Is Direct3D nondeterministic?

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Hi, we are trying to do automated testing on our software which uses d3d for displaying almost everything. After some trying, we realized that after rendering the same scene twice (nothing changed, really), it looks the same, but after the automated tester compares it, it has a few pixels difference (around 4-5 pixels, usually). More precisely, it has a difference of only 1, and oly in the green value. We tried this with an older GeForce and a radeon 9600 too, but it behaves the same. (dx 9.0b, latest drivers) How can this happen? This is very strange for me.. since now I thought it is deterministic, and gives exactly the same output for the same input. Thanks for sharing your ideas in advance, Peter

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