1.5 Performance question

V-Ray V-Ray for 3ds Max General
1

I was curious if anyone is experiencing similar performance issues with 1.5. I’m one of the few that jumped from 1.09 to 1.5. I realize there are many changes between builds but I was hoping for 1.5 to be a bit faster if not the same. What I have found so far is 1.5 is 2 to 4 times slower then 1.09. I have used it on a verity of interior and exterior environments with the same results.

I have read the material on the web site and went through a few tutorials with 1.5 but I still found it much slower. I’m hoping there is a magical setting I’m missing. Now I have checked the material subdivisions and made sure it was set to 8…no help there.

Any feedback would be greatly appreciated.

Thanks.

Scott.

2

If you open a 1.09 or 1.47 scene in 1.5, it’ll crawl - what happened between the two is that the sampling got way more efficient so you can get the same image quality with a lot less subdivs in less time - You’ll be able to turn down glossy subdivs, area shadow subdivs and qmc settings. The old settings you have in 1.09 or 1.47 scenes are overkill for 1.5 hence why you’re getting longer render times.

3

Thanks for the quick response………that would seem to make sense. I guess I could experiment with some of the settings; however, do you have any suggestions on some basic settings I can start with?

Thanks.

4

The most important setting is the rQMC threshold, if you where running it at .001 in 1.47, setting it to .005 should get back in the same ballpark.

5

Hey Eric……..thanks. That was the first area I went to tweak the settings. It helped a little but I’m still way behind the performance curve. I rendered one frame using the “Med Animation” presets and the times where as follows: 1.09 was 6m3sec. 1.5 was 11m52sec.

This may be a stupid question or comment but I do not understand why it would matter if you open a scene originally rendered with a previous version of Vray? Besides the materials subdivisions changing, how can the rest of the settings matter? The settings are not burned into the geometry.

I think for now, I will have no choice but to render this scene using 1.09 and perhaps use 1.5 for new projects and hope for the best.

Thanks again.

6

One scene I had was rendering insanely slow, even though I tweaked the settings. I switched the renderer to scanline and back to vray to reset the settings and turned things to where I wanted them.

It dramatically speed up the rendering and was a lot easier than trying to figure out which values should be adjusted individually.

7

dont fotget alot of samples would be seen as 50 when they should be 8. like in glossies and in the QMC for secondary bounce

8

Also now the medium animation settings use some GI blur as well… that generally isnt liked. So you may want to set the preset to medium animation … then switch back to custom .. it will retain all the same settings then put the blur GI to 0.0

Most liekly as the other said it will be your QMC values that are out of whack.

9

another thing to remember that in the vray materials subdivisions for glossies effetcs like reflection and refractions was 50 in 1.09.03 and now from the 1.4.xx until now (r3) the subdivisions are 8 if u don’t uchange them the tim will raise up incredibly too
bye :wink:

oops da_elf yet wrote the same thing excuse me :sweat_smile:

10

Thanks everyone…I have already calculated the GI passes in 1.09 with no problems and I’m now rendering the animation, however, I will take this advice for future projects. I appreciate the help.

Scott.