When i render scene with volumetric clouds and usual object - in the object id pass i did not see volumteric - only black color/

I was render simple scene with clouds. I try to compose in nuke. In buetty pass its normal. But in diffuse pass (in other pass i dont find volumtric)
volume is very dark шn comparison with usual objects.

Hello, There is a problem with render picture with motion blur. With shader wihtout displace it work fine. But with displace moition blur not render. I try render motion vector too - but it give same result.
Snapshot without displace
https://yadi.sk/i/PRlUT84juREpu
https://yadi.sk/i/PRlUT84juREpu ...

Oh. its very interesting for me. I have 64 bit houdini on windows. Can i test the octane for houdini ?