Hello wise Blender vets,
I’m trying to work out how to get a RGB Speed vector pass to work with Nuke or AE using ReelSmart Motion Blur 3.
To obtain this pass, in render nodes, I’m hooking up a File Output node to the Speed output on the render layer.
Each 3D app exports a variation on the Speed Vector theme, and I’m trying to get Blender’s to more resemble those that Maya spits out. RSMB does a fairly good job on the SV pass from Blender, but I was wondering if you could fake it thus:
Could you construct a cube to encapsulate your whole geometry, and place coloured Area lamps at each axis (middle of each face of the cube, inverted normals) pointing to the exact centre of the cube, then parent the lamps to the cube and the cube to the camera. Then colour all your geometry white with a premul black background. The result would at least LOOK like an RGB pass, even if pixel speed was not being calculated.
Or - and I’ve had a look at the Nuke/Reelsmart websites, is there a way to convert the Speed Vector process used by Blender to one employed by Maya/Mental Ray?