Vray > Toxic (veloctiy pass)

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Old 02 February 2013   #1
Vray > Toxic (veloctiy pass)

Does anyone know the correct settings for Vray's velocity render element?

Should "clamped velocity" be on?
How to determine Max Veloctity?
Should "Ignore Z be on"?
Should filtering be off?
 
Old 02 February 2013   #2
not sure what clamped velocity is doing but I would assume its going to scale you motion blur down so I would probably keep it off as you can adjust the amount of motion blur later anyway.

To determine max velocity bring up the motion blur render pass element in the attribute editor. There should be a box that says something about velocity. (cant remember exactly what it's labeled as. Anyway it calculates per frame so go to the point in your animation where the most movement is and write down the number. Now go a frame back and read the number again. Subtract the two and that is your max velocity.

Leave ignore z off

Dont know what filtering does
__________________

 
Old 02 February 2013   #3
Don't clamp. You want to give your valocity pass the freedom to go as high as it needs to.
 
Old 02 February 2013   #4
Thanks guys, yes - no clamping is giving me much better results.

Also found that V-Ray doesn't seem to have an alpha for the velocity so feeding in the beauty pass's alpha to the velocity eliminates a lot of problems as well.
 
Old 02 February 2013   #5
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