Render with V-ray standalone, noticeable differences/bugs between render engines

[afecelis]

Hi everyone,
Running some some simple tests, changing the render engine , there are several differences that are quite noticeable (or very subtle) on the final result. Taking the production engine as reference, I understand each engine will converge into a different final image but I'd like to know if the gap between them will be smaller with time. Basically, CPU engines read the hdri's intensity fine. When switching to GPU engines the background is darker although the intensity and lighting is the same. OpenCL doesn't read the UV mapping info on the grass. The hdri background-intensity issue also happens when rendering with V-ray RT CPU/GPU.

regards,
Alvaro

[vladimir.nedev]

Can you attach the scene, I know I have a similar one from you, but I want exactly the one you are working with here.

Greetings,
Vladimir Nedev

[afecelis]

Thanks for replying Vlad. Indeed, I apologize for not posting it earlier. You can download it here:
http://www.telardigital.com/afecelis...modo_house.zip

Just make sure to replace the exr in the environment with one of your own.

Regards,

Alvaro

[boyan]

Hey, afecelis

Thank you for the feedback.Well, and my opinion below.

1. Standart Production vs. the RT-CPU - LC might be a difference, because when we used RT -CPU only BF is enabled.
2. Standart Production vs. RT GPU - This issue will have been fixed by next major release. This is being logged to our system.
3. Standart Production vs. RT GPU OPEN CL - I am not sure that we support this feature as well.

Cheers,

[afecelis]

Hey, afecelis

Thank you for the feedback.Well, and my opinion below.

1. Standart Production vs. the RT-CPU - LC might be a difference, because when we used RT -CPU only BF is enabled.
2. Standart Production vs. RT GPU - This issue will have been fixed by next major release. This is being logged to our system.
3. Standart Production vs. RT GPU OPEN CL - I am not sure that we support this feature as well.

Cheers,

Thank you Boyan, that's great news! Looking forward to #2, getting the same intensity in the background is very important to me, and being able to use CUDA/GPUs is a major advantage. I hope more stuff gets translated into OpenCL specially for AMD card users.
Quick question, why is only BF working now in GPU rendering? May light cache (and IM) be implemented some day?

regards,

Alvaro

[boyan]

Hey, Alvaro

Thank you for the post.

Quick question, why is only BF working now in GPU rendering? May light cache (and IM) be implemented some day?

About this question Blago or Vlado can answer you.

Cheers,

[boyan]

Thank you Boyan, that's great news! Looking forward to #2, getting the same intensity in the background is very important to me, and being able to use CUDA/GPUs is a major advantage. I hope more stuff gets translated into OpenCL specially for AMD card users.
Quick question, why is only BF working now in GPU rendering? May light cache (and IM) be implemented some day?

regards,

Alvaro

Hey, Alvaro.

I think you can trick it and IM and LC can be used with GPU also. How to do that?
Well, you need a little preparation for that.
1.Double your required resolution, and run CPU final render.
2.When the LC and IM map is being built, stop the bucker render. Save both of them to disk for later usage.
3.Return to render resolution -> Load IM and LC maps.
4.Run GPU from Standalone or from the tab bar.

I've done it here:https://my.pcloud.com/publink/show?c...YXEO4YLzxahGz7

Cheers,

[afecelis]

Hey, Alvaro.

I think you can trick it and IM and LC can be used with GPU also. How to do that?
Well, you need a little preparation for that.
1.Double your required resolution, and run CPU final render.
2.When the LC and IM map is being built, stop the bucker render. Save both of them to disk for later usage.
3.Return to render resolution -> Load IM and LC maps.
4.Run GPU from Standalone or from the tab bar.

I've done it here:https://my.pcloud.com/publink/show?c...YXEO4YLzxahGz7

Cheers,

Wow! That's quite the hack! but a clever one. Thank you Boyan, I'll give it a try. Also, thanks for the video.

regards,

Alvaro

[vladimir.nedev]

The issue with environment intensity on GPU is fixed for today's nightly build ( 2018.02.16 ).

Greetings,
Vladimir Nedev

[afecelis]

The issue with environment intensity on GPU is fixed for today's nightly build ( 2018.02.16 ).

Greetings,
Vladimir Nedev

Thank you Vladimir! I presume it's the newly released Vray 3.6 for Modo? Downloading now!

regards,
Alvaro