Vector blur was averaging z-values between pixels, which could give wrong z-test results. While averaging is needed for speed vectors to avoid holes, for z-values it is not required and not doing it seems to avoid artifacts in specific cases.
Vector blur was averaging z-values between pixels, which could give wrong z-test results. While averaging is needed for speed vectors to avoid holes, for z-values it is not required and not doing it seems to avoid artifacts in specific cases.