[seghier]

Hello, after testing V5 :
- Random color don't work with GPU or all procedural textures don't work with GPU
- Pymaxwell help is missing
- Embed materials from Web library don't work

[Daniel Kerbler 20191031100659]

yeah, procedurals are not yet supported on the gpu.

here you find a clear table of what features are still missing concerning CPU vs GPU

https://nextlimitsupport.atlassian.net/ ... GPU+engine

[luis.hijarrubia]

Hello, after testing V5 :
- Random color don't work with GPU or all procedural textures don't work with GPU
- Pymaxwell help is missing
- Embed materials from Web library don't work

Procedurals are not supported on GPU.
Brany is working on it, I hope next patch.
We changed server and it seem that materials gallery is not working. IT is working on it, it should be possible to fix it from here without have to wait to a patch.

[seghier]

Thanks
Render region don't work , is this limitation of demo version?

[seghier]

Another problem i think is from v3 and still exist
In Local browser when choose outdoor ies folder studio blocked and force closed

[seghier]

Test Glass , in GPU render some areas are dark compared to CPU render

CPU:



GPU:

[T0M0]

raydepth limitation ?

[luis.hijarrubia]

It can be. If my memory is correct GPU is limited to 18 bounces. This can be easily changed. We need to check performance. Anyway, dielectrics may have issues on GPU yet, so maybe it's not only the max bounce.

[T0M0]

I was always curious how ray depth works in Maxwell (speaking of CPU engine).
Is there some value hardcoded for each ray type or maybe some "system" that automatically adjust ray depth based on energy of light reached after certain bounces ? ( i.e. stop computing if value reaches certain threshold )

[luis.hijarrubia]

I was always curious how ray depth works in Maxwell (speaking of CPU engine).
Is there some value hardcoded for each ray type or maybe some "system" that automatically adjust ray depth based on energy of light reached after certain bounces ? ( i.e. stop computing if value reaches certain threshold )

That code is really old, and I may be wrong. But as far as I know there is no max depth. If you hit sky is game over. If not we have some criteria, like amount of energy that is going to be give to the final pixel or roughness acumulated (try not to kill rays if they are bouncing on mirrors or through glass), and we do a random russian roullete (weaker rays have more chances to be killed). If you kill a ray you adjust the energy that you may loose, giving the other samples a little extra energy.

Is something like that, not very precise explanation, but you can make an idea with this. Maybe we need a place to talk with the most entuthiastic people in private I don't want to post in public all our secret souce

[T0M0]

I don't want to post in public all our secret souce :lol:

I absolutely understand that :) Thank you for your time and answer Luis.

[seghier]

I test MERL Material (TableBRDF)
the render or preview is very slow ; there is this tool from Disney to preview BRDF materials and it is fast
https://www.disneyanimation.com/technology/brdf.html

https://nextlimitsupport.atlassian.net/ ... +TableBRDF
-----------
In Maxwell every change in material settings affects BRDF material , i think this must be added to the manual.
To show the real BRDF , reflactance 0/90 must be black and roughness 100

[bobross]

What is all this "ray depth" talk? I thought MR is the "ground truth" render engine. Should it just not look right no matter what?

[luis.hijarrubia]

What is all this "ray depth" talk? I thought MR is the "ground truth" render engine. Should it just not look right no matter what?

Ground Truth (what in real world means we don't fake a lot of things others do) is true on CPU, that's why we don't have a maximum ray depth there. We have it on GPU. But we have to re-check that, make that number bigger or (if performance is not really affected) have no maximum ray depth on GPU either.

[bobross]

What is all this "ray depth" talk? I thought MR is the "ground truth" render engine. Should it just not look right no matter what?

Ground Truth (what in real world means we don't fake a lot of things others do) is true on CPU, that's why we don't have a maximum ray depth there. We have it on GPU. But we have to re-check that, make that number bigger or (if performance is not really affected) have no maximum ray depth on GPU either.

Ah, I understand now. Thank you!