Reasonable Render Settings

[GregCooper]

Just updated to Vray 6, are these changes to the GPU render settings reflected in the docs? I can't find them if so.
Bit confused about Samples Limit and Rays per Pixel, I'm assuming samples limit has just replaced 'Max Samples' in Vray 5 but the numbers have shifted. For GPU I used to set it to max samples of 100 and just control quality with the noise threshold.
Muhammed_Hamed I see you've mentioned 2500 should be around the same as 48 max samples? is this still high enough for most GPU renders as that used to get me noise with glass materials.

And would this 'samples limit' now be comparable to number of samples in Octane render? I was always a bit confused about the difference in terminology between Vray GPU and Octane

[Muhammed_Hamed]

GPU Samples Limit 2500 seems to be 25 subdivisions when you change the engine to cpu: sqr(2500/4). if just the default value of max samples per pixel (described in subdivisions) changed it would be Samples Limit of 576 not 2500. The default value and what the number means changed at the same time - question is why?

V-Ray GPU will use double the Max Subdivs of what the standard V-Ray uses, in our testing this produces very close noise results
So 24 Max Subdivs on CPU, translates to 48 Max Subdivs on GPU which is 2500 Samples Limit

Best,
Muhammed

[Muhammed_Hamed]

Muhammed_Hamed I see you've mentioned 2500 should be around the same as 48 max samples? is this still high enough for most GPU renders as that used to get me noise with glass materials.

And would this 'samples limit' now be comparable to number of samples in Octane render? I was always a bit confused about the difference in terminology between Vray GPU and Octane

Yes to both questions
2500 Samples Limit is 48 Max Subdivs in V-Ray 5 for Maya. It should work well for most cases
You can go to 5000 Samples which is around 70 Max Subdivs if you need cleaner results

The goal of this change in the GPU UI is ease of use, in most cases you will use noise threshold to control quality/noise and leave samples limit to 2500 or 5000
On another note, if you have a scene setup for the standard V-Ray (CPU) your sampling settings will get translated automatically to V-Ray GPU. This helps people testing GPU rendering on their existing scenes, the noise results will be close between V-Ray and V-Ray GPU

Best,
Muhammed