Displacement grinds render to a halt

[hellobard]

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?

[Neilg]

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.

[vlado]

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

[hellobard]

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

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%


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.

[Zdravko]

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