I am working on a game and would like to add motion blur to videos that I export from the engine. Right now, I play back gameplay at 1/16th the original speed, giving me 16x more frames (e.g. instead of 60 frames per second, it's 960 frames per second) and averaging the frames. I am curious though, is this the proper weight or should I give frame samples closer to the middle more alpha? Also, should the frames sampled be sampled uniformly?
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You might want to rethink motion blur and only do it for one frame, not blending between several. This will help you avoid a lot of edge cases where your frame rate is stuttering and you have to decide on which frames to blend and how much. A common way to do this is using motion vectors, where you render your scene again, with extra data for each mesh, and render screen space velocity into a separate buffer. This buffer can then be used as a blur direction control. to compose the final blurred image. You can also build depth of field information at the same time using this technique. |
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