URGENT PROBLEM with my bachelor's thesis: SketchUp V-Ray renders one scene for 40 hours. Please help

I have a serious problem with my bachelor’s thesis (interior design). I need to render about 10 scenes out of my project and each scene takes about 40 hours to render. I can’t meet the deadline and my PC will die if I don’t change it. Please help me with finding better rendering settings, screenshots below.

I use SketchUp 2019 with V-Ray. Here’s an example rendered scene (40h of waiting):

In my project I use approximately 100 lights (mostly omni lights and dome lights). They are important for my project and its interior design.

Here are my V-Ray settings:

Engine: CPU
Interactive: off
Progressive: on
Quality: High
Update Effects: At the End
Denoiser: NVIDIA AI on

Type: standard
Stereo: off
Exposure: on
Exposure Valve: 25
White Balance: default (1,1,1)

Render Output:
Safe Frame: off
Image Width/Height: 1600/900
Aspect Ratio: 16:9 Widescreen

Everything else is off or default. Please help me finding a way to get a normal render time. Thanks in advance.

Here’s another example scene I would like to render:

You could try how much faster GPU rendering might be as your graphics card ought to support it.
I would turn Progressive off, too. You have Denoiser on, so stepping Quality down a bit should be unnoticeable.
Are your materials unnecessarily complicated? Glass? Displacement maps?
How are you lighting the model? Is it just the sun or are you complicating things with hidden point and plane lights?

Wow, that seems like a lot. I know know much about V-Ray but I would think so many light sources will slow down any renderer.

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I’ve just tried to render with my GPU but an error appeared:

My graphic card is NVIDIA GTX GeForce 1050 with Max-Q Design. Google says that I lack VRAM, unfortunately I don’t know what it is and how to help it. My graphics card is quite good so rendering via GPU should be better, however it doesn’t work. Do you know how to overcome it?
When it comes to glass it is just default set to low opacity. If it would help I could delete it and add it back in Photoshop.
I have 19 dome lights, 94 omni lights representing bulbs 3 rectangle lights and 1 sunlight (0,793). There is something wrong with the lights because to make the scene visible I needed to set the domlight to 80 000. Is it caused by the height of the model (6,5m)?

The model is about 2000 m2 (square meters). Do you suggest to delete all the lights and set them separately to each scene? This way I would have only about 5-15 lights per scene = per render.

Just disable the lights that have nothing to do with the scene. The render time should be much shorter with only a few lights to render.

Keep in mind that this rendering stuff is just a whole lot of math. There are calculations done for every light ray from every light. With your huge number of lights there’s a vast number of calculations that are getting done. That takes time. Reduce the number of calculations and you’ll reduce the time.


Your first image has no visible artificial light sources, so for that one you could turn them all off. It can be done using just the sun.
I don’t know if omni lights are the best for bulbs, I usually use sphere, rectangle and spot lights
What are the many dome lights for? They are meant for simulating environmental lighting with a HDRI image - I see you using many in a single space…
About GPU rendering - make sure that your Nvidia driver is up to date, check from the Nvidia website.

Try rendering with Progressive turned off. Progressive means it just keeps going until you stop it yourself. 40 hours is too long. If that still doesn’t do the trick you may want to try Chaos Cloud - which sends your model to a render farm and kicks back the final result for you. You should have some cloud credits included with your license so depending on the size (dimensions) and qty of your views, you may need to pay a bit…but could be worth it given the deadline. Good luck!

Have you thought about rendering everything through the Chaos Cloud. You get some free credits when you sign up. There system is incredibly fast.

I suggest you to turn “progressive” option off… Denoiser vray and “at the end” selected… Quality medium+ , high takes long time unnecessary in my opinion… Adding domelight with default settings can help also, you may want to check invisible option to see outside of the window…
If brick texture has displacement, it will increase render time, using just bumpmap helps a lot…

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I suggest you change the graphics card, the rtx Graphics Card has light tracing function, can reduce the rendering time

I have a RTX card and I see no big difference between CUDA and RTX mode. The OP:s problem is almost certainly not solvable by hardware. And if the expected rendering time is 40 hours, a difference of a half an hour is not worth the money.

Let’s keep this on topic. The OP is using V-Ray and posted in the V-ray section of the forum. Telling them to use a different renderer is not a solution.


Personally, anything beyond 5h render time is just not viable. 40h is crazy.

That scene shouldn’t take so much even on a potato pc; you re definitelly using WAY to many light sources. Try to keep it at max. 4 sources.

also its not the best habit to use vray quality presets, its better to study the parameters.

but anyways… would you mind to post your scene file? we could give more acuratte tips for sure.

obs: please post SU18 file version or lower so I can test it.