Insane Vray 2.0 rendering time

[mikkeltroelsen]

Hello, I'm a new Vray user. I've only done a couple of rendering projects before, but the rendering times always skyrocket. This time i had it running for 15 hours and it was only done with the prepasses. I used the default indoor rendering setting for very high quality, and the image was 3525 by 2475. The materials i've used have a lot of subdivisions, because the scene is primarily lit with emissive lighting. The floor had to be done with 500 subdivisions to eliminate the light specks. I've allocated 7gb of ram, but it only uses 500 mb for some reason.

 

Any and all help will be greatly appreciated!

 

Kind regards, a stressed out newb.

 

Specs: i7-4790K 4GHz

GeForce 760 GTX 4GB

8GB Ram

Edited November 16, 2015 by mikkeltroelsen

[augustobohm]

How many irradiance map passes you have? If is 5 i thinkmaybe it could be too much.

[mikkeltroelsen]

Thank you for the response, i used the very high quality preset with 4 passes, which took 14 hours just for those prepasses

Edited November 16, 2015 by mikkeltroelsen

[augustobohm]

Well... 4 passes isn't that much, i think there is a pass that search for complex fields in the scene, but i can't remember the name. Di you checked if the render is uniformly slow or there are just some sopts?

[mikkeltroelsen]

It is generally slow, but it has some variance depending on the material it is rendering. The floor and walls are particularly slow

[augustobohm]

Try removing the maps f the floor and walls, maybe they are too big or something else. You can also do a clay render using override mtl.

[augustobohm]

Did it worked?

[mikkeltroelsen]

Still rendering, but it did the floor and walls very fast with just default material. But it is still extremly slow when passing over the rest of the scene.

[augustobohm]

Can you post the render settings?

[mikkeltroelsen]

Here they are, do you need to see anything else?

[augustobohm]

Nothing, sorry...

[ludnid]

500 subdivisions is way too much for anything in my opinion. That floor material can work with 128 or 256 max. Actually i hardly ever go beyond 128 when i render in sketchup. If you have your materials set up with such huge subdivisions then your rendertimes are bound to be high.

 

But first, what are the specs of your current system?

[mikkeltroelsen]

Thank you for the reply. My current specs are:

 

Windows 8 64 bit

i7-4790K 4GHz

GeForce 760 GTX 4GB

8GB Ram

 

I tried with 256, but i still got the light specks on the material. I don't know if it's because the intensity of the emissive material is too high, but i has to turn it up a lot to get any light into the render.

[RyderSK]

What is "Emissive material" ? VrayMtl with SelfIllumination ? Or VrayLightMtl ? You should use the latter. Still it's highly preferable you either:

 

A: Convert those bulbs to VrayLight/Meshes. SubOptimal but much better.

or B: Make those bulbs from normal Glass ("Thin" for thin geometry, or Refractive for Shell geometry) and put normal VrayLight/Sphere inside.

 

Optionally, update to Vray 3 for Sketchup and use 'default' settings. Don't tweak anything you don't understand, it's not needed.

[ludnid]

Thank you for the reply. My current specs are:

 

Windows 8 64 bit

i7-4790K 4GHz

GeForce 760 GTX 4GB

8GB Ram

 

I tried with 256, but i still got the light specks on the material. I don't know if it's because the intensity of the emissive material is too high, but i has to turn it up a lot to get any light into the render.

 

OK, just wanted to be sure you weren't working on a system with low specs and expecting good render-times. Juraj's said it all, why use emissive materials to light a scene? Create vray lights where you've got your lights or use a sphere.

 

There isn't any vray 3 for sketchup. Its just 2.0 but it comes with presets, try selecting the interior preset without tweaking anything unless you really understand what it does. A good note will be the tips that come up when you hover your mouse over some of the options. Otherwise you can head over to spot3d and read more on some of the vray settings.