To get convincing motion blur, you may need more than four rendered
frames per real frame, but that isn't your problem.
If you're using an 8-bit per color component accumulation buffer, you
will get visible aliasing proportional to the number of frames per
real frame. (four frames = effectively 6-bit per component buffer.)
Try using a 16-bit per component accumulation buffer instead, that'll
let you render 256 frames per saved frame without naked-eye visible
aliasing, although it will be slower.
-:sigma.SB
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