Motion Vector output artifacts. Help!!!

[Lee Hallett <lee.hallett(at)bbc.co.uk>]

Hi peeps.

I'm outputting motion vectors using the standard (built in) mental ray 'motion' framebuffer output to use in Reelsmart motion blur, and have hit a problem I can't seem to resolve. I'm getting strange artifacts on both the rendered image and the motion vector (tiff, 16bit) output. I've attatched an image to show the artifacts.

Using 32bit 6.01 (on XP64), model is envelope, some shape animation, modelling frozen, simple SRT on the model root. Has anyone else come across this?

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