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When i switch off CPU fallback and CPU for render IRAY showing black screen

randomedits1903randomedits1903 Posts: 15
in New Users

Hello guys, as I mentioned in the title, I am faced with a very strange problem. When I render with CPU it is very slow, any help suggestions?

This my options: https://imgyukle.com/i/r15fwc

And here it is my video card LOG

2023-07-25 21:15:42.967 Iray (Scene Update) : Updating LPE labels

2023-07-25 21:15:42.968 Iray (Scene Update) : Updating geometry

2023-07-25 21:15:42.968 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info : Updating geometry.

2023-07-25 21:15:42.968 Iray (Scene Update) : Retrieving geometry

2023-07-25 21:15:42.968 Iray (Scene Update) : Updating motion transform data

2023-07-25 21:15:42.968 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info : Updating motion transforms.

2023-07-25 21:15:42.968 Iray (Scene Update) : Updating section objects

2023-07-25 21:15:42.969 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info : Importing scene graph.

2023-07-25 21:15:42.970 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info : Importing geometry for motion time 0

2023-07-25 21:15:46.978 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info : Geometry import (1 triangle object with 54 M triangles, 0 fiber objects with 0 fibers (0 segments), 1 triangle instance yielding 54 M triangles, 0 fiber instances yielding 0 segments) took 4.008 s

2023-07-25 21:15:46.978 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info : Updating section objects.

2023-07-25 21:15:46.979 Iray (Scene Update) : Updating materials

2023-07-25 21:15:46.979 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info : Updating materials.

2023-07-25 21:15:47.618 Iray [INFO] - MATCNV:RENDER ::   1.0   MATCNV rend info : found 265 textures, 0 lambdas (0 unique)

2023-07-25 21:15:47.625 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info : Computing 2 flux compensation factors took 0.001 s

2023-07-25 21:15:47.625 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info : Emitter geometry import (54 light sources with 2598 triangles, 1 instance) took 0.002 s

2023-07-25 21:15:47.626 Iray (Scene Update) : Updating volumes

2023-07-25 21:15:47.626 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info : Updating volumes.

2023-07-25 21:15:47.626 Iray (Scene Update) : Updating environment

2023-07-25 21:15:47.626 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info : Updating environment.

2023-07-25 21:15:48.636 Iray (Scene Update) : Updating lens data

2023-07-25 21:15:48.636 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info : Updating lens.

2023-07-25 21:15:48.636 Iray (Scene Update) : Updating lights

2023-07-25 21:15:48.636 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info : Updating lights.

2023-07-25 21:15:48.637 Iray (Scene Update) : Updating instance topology

2023-07-25 21:15:48.637 Iray (Scene Update) : Updating flags

2023-07-25 21:15:48.637 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info : Updating object flags.

2023-07-25 21:15:48.638 Iray (Scene Update) : Updating backplate

2023-07-25 21:15:48.638 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info : Updating backplate.

2023-07-25 21:15:48.638 Iray (Scene Update) : Updating portals

2023-07-25 21:15:48.638 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info : Updating caustic portals.

2023-07-25 21:15:48.638 Iray (Scene Update) : Updating decals

2023-07-25 21:15:48.638 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info : Updating decals.

2023-07-25 21:15:48.652 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info : Using iray core convergence estimate.

2023-07-25 21:15:48.652 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info : Allocating 1-layer frame buffer

2023-07-25 21:15:48.656 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info : Using batch scheduling, caustic sampler disabled

2023-07-25 21:15:48.657 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info : Initializing local rendering.

2023-07-25 21:15:48.658 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info : Available GPU memory has increased since out-of-memory failure. Re-enabling CUDA device 0 (NVIDIA GeForce RTX 3060 Laptop GPU)

2023-07-25 21:15:48.661 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info : Initializing OptiX for CUDA device 0

2023-07-25 21:15:49.588 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info : Rendering with 1 device(s):

2023-07-25 21:15:49.588 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info : CUDA device 0 (NVIDIA GeForce RTX 3060 Laptop GPU)

2023-07-25 21:15:49.588 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info : Rendering...

2023-07-25 21:15:49.588 Iray [INFO] - IRAY:RENDER ::   1.10  IRAY   rend progr: CUDA device 0 (NVIDIA GeForce RTX 3060 Laptop GPU): Processing scene...

2023-07-25 21:15:49.589 Iray (Scene Access) : Retrieving geometry

2023-07-25 21:15:49.589 Iray (Scene Access) : Retrieving device geometry

2023-07-25 21:16:00.343 Iray (Scene Access) : Retrieving volumes

2023-07-25 21:16:00.344 Iray (Scene Access) : Retrieving textures

2023-07-25 21:16:21.452 Iray (Scene Access) : Retrieving device textures

2023-07-25 21:16:22.224 Iray (Scene Access) : Retrieving flags

2023-07-25 21:16:22.225 Iray (Scene Access) : Retrieving device flags

2023-07-25 21:16:22.226 Iray (Scene Access) : Retrieving lights

2023-07-25 21:16:22.237 Iray [INFO] - IRAY:RENDER ::   1.13  IRAY   rend info : Importing lights for motion time 0

2023-07-25 21:16:22.242 Iray [INFO] - IRAY:RENDER ::   1.13  IRAY   rend info : Initializing light hierarchy.

2023-07-25 21:16:22.269 Iray [INFO] - IRAY:RENDER ::   1.13  IRAY   rend info : Light hierarchy initialization took 0.026 s

2023-07-25 21:16:22.271 Iray (Scene Access) : Retrieving device lights

2023-07-25 21:16:22.271 Iray (Scene Access) : Retrieving section objects

2023-07-25 21:16:22.271 Iray (Scene Access) : Retrieving device section objects

2023-07-25 21:16:22.271 Iray (Scene Access) : Retrieving materials

2023-07-25 21:16:22.277 Iray (Scene Access) : Compiling custom code

2023-07-25 21:16:22.277 Iray (Scene Access) : Retrieving environment

2023-07-25 21:16:22.386 Iray (Scene Access) : Retrieving device environment

2023-07-25 21:16:22.483 Iray (Scene Access) : Retrieving backplate

2023-07-25 21:16:22.483 Iray (Scene Access) : Retrieving device backplate

2023-07-25 21:16:22.483 Iray (Scene Access) : Retrieving portals

2023-07-25 21:16:22.484 Iray (Scene Access) : Retrieving decals

2023-07-25 21:16:22.486 Iray (Scene Access) : Retrieving device decals

2023-07-25 21:16:22.489 Iray (Scene Access) : Retrieving motion transform data

2023-07-25 21:16:22.490 Iray (Scene Access) : Retrieving device motion transform data

2023-07-25 21:16:22.490 Iray (Scene Access) : Retrieving lens data

2023-07-25 21:16:22.490 Iray (Scene Access) : Retrieving device lens data

2023-07-25 21:16:22.599 Iray [INFO] - IRAY:RENDER ::   1.10  IRAY   rend info : CUDA device 0 (NVIDIA GeForce RTX 3060 Laptop GPU): Scene processed in 33.007s

Comments

  • PerttiAPerttiA Posts: 10,024

    How much VRAM does your GPU have?

  • randomedits1903randomedits1903 Posts: 15

    PerttiA said:

    How much VRAM does your GPU have?

    6gb VRAM, laptop gpu

  • PerttiAPerttiA Posts: 10,024

    randomedits1903 said:

    PerttiA said:

    How much VRAM does your GPU have?

    6gb VRAM, laptop gpu

    That is just not enough.

    Practical minimum for the latest versions of DS, using relatively recent assets, is 8GB's of VRAM. 

  • randomedits1903randomedits1903 Posts: 15

    PerttiA said:

    randomedits1903 said:

    PerttiA said:

    How much VRAM does your GPU have?

    6gb VRAM, laptop gpu

    That is just not enough.

    Practical minimum for the latest versions of DS, using relatively recent assets, is 8GB's of VRAM. 

    What do you suggest I do? Is it useful to reduce 8k things to 4k with the scene optimizer?

  • SofaCitizenSofaCitizen Posts: 1,873

    This is quite a common issue. When the scene is too big for the VRAM in your card it will fallback to CPU rendering - if you disable this option then there is no choice but to give you empty black nothingness.

    You either need to re-enable CPU fallback and wait the extra time, split the image up and render parts in stages and then combine the result in an image editor or use scene optimiser, camera view optimiser, resource saver shaders and/or other methods to reduce the resources required until it can fit in the VRAM of your card.

    Alternatively, you can pay for one of the cloud render services I suppose.

  • PerttiAPerttiA Posts: 10,024

    randomedits1903 said:

    PerttiA said:

    randomedits1903 said:

    PerttiA said:

    How much VRAM does your GPU have?

    6gb VRAM, laptop gpu

    That is just not enough.

    Practical minimum for the latest versions of DS, using relatively recent assets, is 8GB's of VRAM. 

    What do you suggest I do? Is it useful to reduce 8k things to 4k with the scene optimizer?

    One single 8k image takes 192MB's of RAM and with the default Iray compression settings 96MB's of VRAM, a 4k image takes 48MB's of RAM and 24MB's of VRAM.

    The baseload from Windows, DS, the scene and the needed "Working Space" are taking about 4GB's of VRAM, which on a 6GB card leaves about 2GB's of VRAM for geometry and textures. That's one G8 figure with clothing and hair (not strand/dforce hair) with very little else in the scene.

  • randomedits1903randomedits1903 Posts: 15

    Thank you so much guys.

  • ElliandraElliandra Posts: 552

    Another tip is to save out your scene when it's ready to render and then shut down DS so it clears its cache and temp files which can also take up your memory. Then restart DS, load your scene and render.

  • randomedits1903randomedits1903 Posts: 15

    Elliandra said:

    Another tip is to save out your scene when it's ready to render and then shut down DS so it clears its cache and temp files which can also take up your memory. Then restart DS, load your scene and render.

    Thank you so much!

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