Vray Proxy particle color

[akos_kiss]

Hey dearest community,

I found no resource for my issue so far online, so I'm here.

I have a 44 million particles from Houdini in an alembic. I tried render it with the vray particle route (importing the abc and point the vray particle object to the alembic object), the only issue is, that 44 million particles is way above C4D capabilities sadly. The render took ages, for no reason and the memory footprint was very very substantial(200GB+).
I found an other router, vray proxy. Importing the alembic via the vray proxy object works fine and the render is reasonable.

My only issue is, that I did not find any documentation on, what sort of data vray's looking for for attribute. What should be the name of a color data coming from Houdini, so Vray pick it up on particles rendered as a vray proxy, color, orient ect...

Thank you!

[bozhidar_ivanov]

Hello akos_kiss,
I played around a bit and couldn't get it to work properly with a proxy. You can read the color data either with a Particle Sampler or a User Color with the attribute Cd and just apply the material on the proxy, however, I was not able to read any of the other channels in the alembic. So currently if you want to access those attributes you would need to import it as a Cinema4D alembic and use a V-Ray Particles object with a V-Ray Particle Sampler(which should let you sample the builtin V-Ray particle channels like color/acceleration/age). I tried importing what I think was an alembic with about 10 million particles each frame(as a particle group) and rendered it as V-Ray particles which barely took any extra memory. So have you tried using the new particle groups available after Cinema4D 2024.4 and if those still don't work can you share a bit more information about your setup?

[akos_kiss]

Hey
Thank you for the answer, I appreciate it, however as I mentioned above, the particle group and vray particle object workflof doesn't work for, me because it requer way too much hardware resource. For the 44 mil particles the render goes above 200GB RAM usage.