VrayVelocity Channel -- can you see it?

[davision]

I'm trying really hard to generate a separate set of frames to use as motion vectors with ReelSmart motion blur.

Every time I try to render out a separate Render Element with Vray Velocity I just get a solid medium grey render.

If I use the mental ray renderer with the standard max Velocity render element (the method is detailed on RS's website), I get an RGB motion vector image, but so far I'm seeing absolutely nothing when trying to do the same thing with VrayVelocity in Vray.

Does the vrayvelocity channel generate visible output -- or is it only a type of embedded information?

Can RGB motion vectors be produced directly with Vray at all?

[percydaman]

I did a test with velocity render pass and had no problems. I'm not sure what your doing wrong, but for me I just added the pass in the render elements tab and went from there.

[davision]

Ohhh.

I figured it out. The instructions on ReelSmarts site say that a max velocity setting of 1.0 (for the render element) is useless. They suggest 2048.

Well -- that's definitely not right. If I use the default 1 -- Vray renders the velocity just fine.

My settings (based on RSMB's recommendations -- I disclaim) were blowing it out.