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Daz doesn't use CPU with advanced renders

christgrchristgr Posts: 0
in Daz Studio Discussion

I know this is a recurrent challenge, but none of the threads I have found solves it:

I monitor the processor usage with MSI Afterburner, and when I have big scenes with lots of objects in them, I have two choices:

1) Swith off CPU rendering and get the result of a blank render (black if I have backgrounds on, checkered transparent if I have no dome and no ground)

2) Render with CPU and GPU at the stame time, with the result being an average of 4% of the load on the GPU and rendering takes 30x the time compared to a render with GPU (it's like rendering with an old laptop).

There must be a way to get Daz to use the GPU in these situations. Or else, the whole idea of investing in good hardware becomes meaningless.

Any help is much appreciated - as this seems to be a recurrent problem for Daz users.

I have updated my NVIDIA drivers to latest version. I have also tried following advice on Daz-specific settings in the NVIDIA Control Panel, but this has no apparent effect.

System
Edition    Windows 10 Home
Version    21H1
OS build    19043.1415
 

Hardware
Processor    11th Gen Intel(R) Core(TM) i9-11900F @ 2.50GHz   2.50 GHz
Installed RAM    16.0 GB (15.8 GB usable)
System type    64-bit operating system, x64-based processor
 

GPU
NVIDIA GeForce RTX 3080
Driver version 472.47
CUDA cores 8704
Dedicated video memory 10240 MB GDDR6x
 

Comments

  • IceCrMnIceCrMn Posts: 2,129

    Without looking at your log file. I am assuming your GPU is going OOM (Out Of Memory) and attempting to drop to CPU, which is disabled. DS used to crash to desktop under those conditions.

    You'll need to do the same things the other threads have suggested really there isn't any other option.

    Your scene has to fit on the GPUs memory or the whole render drops to CPU.

    Nvidia designed iray to work like this and there is nothing Daz, or anyone else can do about it.

    There is no hybrid CPU/GPU rendering in iray.

    It's CPU or GPU, that's it.

     

    Remove things from your scene the camera can't see to save VRAM.

    (i.e) if your character is wearing pants, remove all the textures and maps for the part the pants cover.

    Reduce sub-d to save VRAM

    Reduce texture and control maps down.

    (i.e) No need for 8k bump/displacement maps on a shoe string viewed from a distance.

    Save VRAM every where you can.

    Can also save your scene broken out into parts and render each one separately then composite them in GIMP, PS, Affinity Photo, ect,ect

    Can use canvases to do compositing as well.

    Once you've got your scene optimized, save it. Restart Ds to free VRAM, then render it.

  • PerttiAPerttiA Posts: 10,024

    16GB's of RAM is going to give you troubles, you should have 64GB's or at least 32GB's with that GPU

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