For my simple cornell box scene dPdtime can be output just fine. When I tried to translate this to a more complicated scene I'm finding that all pixels are set to a strange value regardless of speed (see car_motion.exr). I have a similar problem trying to output the speed of occluding objects (see car_shad.exr).
Turn off the raytrace hider or else the car triangles will be messed up (see recent bug report).
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