Displacement grinds render to a halt

V-Ray V-Ray for Maya Issues
1

Hey,

I am having some trouble with displacements that grind my render to a complete halt at the Light cache generation phase (right at the start after geometry has been compiled). It just stops at 0% and stays there forever. This can usually be fixed by setting the dynamic memory to a high level (like 32 GB). My PC has 64 GBs of RAM and I have set dynamic anywhere from 5 GB to 32 GB. My subdivs for the displacement are set to 32, edge length to 4 and I am using water level to cut through some typography through a plane. Input is a 4k displacement image.

Any tips on how to get this to actually render?

2

Try throwing a meshsmooth on your object to add some density and drop the subdivisions down to 4 or 8.

Light cache & displacement never tend to play particularly well though, a few times i’ve had to do displaced objects as a pass because they crash the LC.

3

What cubiclegangster said; try adding some more geometry detail to the mesh. Also, what does your memory usage look like in the task manager?

Best regards,
Vlado

4

Thanks for the help guys! But unfortunately it is not helping. It started out as a plane and now has a mesh smooth of 3 subdivs from Maya. Still grinds the LC to a halt.

I am using 10 GB of 64 GB RAM and all 16 cores are running at 100%. In 30 minutes, the light cache generation goes from 0% to 4% :wink:

Edit:

I had the same scene setup with some different rendering settings and the same objects, so I tried loading those settings into this scene and suddenly it renders just fine now! Very strange… I don’t quite understand which setting might have been halting the LC generation.

5

Is ti possible to send us the scene to support@chaosgroup.com so we could investigate the issue further on.