The surface:dPdtime variable does not seem to return valid values in a gather statement, whereas other variables like surface:N seem to work fine.
gather("", P, shadDir, 0, 1, "surface:dPdtime", VShad);
In the attached example this translates to a black image for cornellbox_shad.exr. Also, the example uses a raytrace hider and hider "samplemotion" set to 0. I believe this problem exists with any hider settings.
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