Hello all, I am new here and relatively new to SU and VRay. I?ve recently upgraded to Vray version 3 (3.40.04) from a very old 1.49. At the same time upgraded from Sketchup 8 to sketchup 2017. My problem is I used to be able to have a render done n 25-30 minutes. Now exactly the same file takes me 2 hours minimum. What could possibly be the reason? Do I need to provide any additional information?
Additionally, when I try to s elect ?GPU Acceleration? option hoping it will speed things up it crashes SU and gives me a brief error message about my NVDIA stopping to response. What am I doing wrong here if anything? Should I not be using GPU acceleration?
Thanks in advance.
Could you give us an idea as to the specifics of your system?
Also, I’m assuming the issue is some old material files being translated from v1.49 to the new vray version maybe are not super efficient. Use BRDF mats whenever possible.
Try resetting the settings on the scene and rendering and seeing if the defaults for v3 fair any better.
Regarding gpu usage, it depends on your scene, your hardware, your settings, etc. Keep in mind that until we get hybrid rendering for SU, then you are limited to your graphics memory
Oh, ok. Well, yeah, definitely don’t use GPU rendering on that card. Depending on which version you have, it may have 1gb or 2gb (neither of which is enough for almost anything you are probably rendering). I’m guessing that you are maxing out your ram whilst rendering, which means you are probably hitting your page file a bunch, which is definitely slowing things down.
I’m not going to touch the fast vs slow discussion, but I would look at it as different. The core engine is probably very similar, but there are differences now, notably in how light is calculated, etc etc. If you are running into issues, I would recommend a ram bump - take a look at your task manager and see what your ram and drives are doing next time you render. I bet that would offer a clue
Hi,
Does the issue occur for specific project or any (even newly created ones)? If it is for specific project, could you share it with us so we can investigate in detail? Please send us an archived copy (Extensions > V-Ray > Export > Pack Project) to support@chaosgroup.com
Additionally, when you open the project, could you reset the settings to default (Asset Editor > Settings > Revert to Default Render Settings) or use the preset quality settings (Asset Editor > Settings > Renderer > Quality) and see if the issue persists?
Regarding the GPU Acceleration, which drivers are installed for the NVIDIA Quadro K420? Does SketchUp crash shortly after initiating the render or at a certain point of the render progress?
Hello, I’m trying to use the new vray 3.4 since the 2.0 has expired, sadly… Renders take SOOOOOOOOO long!! Even with a simple model with 2 blocks and 1 spotlight in a room and no “old” materials, they take ages to complete…
I’m used to rendering at 2400x2400 pixels in 2.0, complex interior renderings took only 30 minutes on my system! And when I used distributed rendering they were done in 6(!) minutes each!
WHAT is going on? What is causing this?
I upgraded to the 3.4.004… So I have the latest version installed. Working on SKP 2017.
Man, I miss 2.0 
What a mess! All materials and libraries down the drain, it’s taken me 6 hours to draw a bathroom I normally do in only 2… I can’t make clients pay for 300% of the time!
And I sure don’t have the time to wait 2 hours on 1 image… HELP!? 
Hi sigrid,
I’m sad to hear that you’ve had such experience with V-Ray.
Does the issue occur in brand new scenes as well?
Kindly note that using ?.vropt? or ?.visopt? files created in previous V-Ray versions is not recommended as some outdated parameters may cause unexpected results.
Could you please try resetting the settings to default and use one of the preset quality settings (Asset Editor > Settings > Renderer > Quality)? Keep in mind that, being part of the render settings, Camera parameters and the Environment texture will be reset as well.
Let me know if that helps. For further assistance send us an email at support@chaosgroup.com so we can properly follow up and get to the bottom of the issue.
Hi Peter,
YOU ARE AN ANGEL!
I tried it and now it rendered in 1min 35sec. Still longer than 2.0 would, but a massive improvement! I’ll try rendering the bathroom again that took 1,5 hours yesterday and see if this helps in a “big scene” as well.. Fingers crossed.
Many thanks and have a nice weekend!
Sigrid
I tried the scene I did yesterday, it took 27 minutes. That’s 1/3 of the previous time, but still way more than the old version… Any more tips to speed things up?
Hi Sigrid, Glad I could help at least a little bit. Are there a lot of lights in your scene? Another way is to use the progressive render in combination with the denoiser. This way you can let it render for say 10 minutes and let the denoiser do it’s work. I use this method if I don’t have a lot of time. You loose a bit of detail though. Maybe you can share some of your scene?
Best,
Peter