How to render high qualitu images with vray rt

[3dvizual]

Hi.

How do I setup VRAY RT if I would like to use this to produce high quality images.

What settings, should I tweak. (I have never used this for producing final images before, but would like to try.)

I don't know if there is a guide to this somewhere, please share if there is.

Martin

[Alan Iglesias]

That's the beauty of RT - there is very little to adjust or tweak other than your usual lighting, materials, and camera concerns. Just create your scene the way you normally would (use RT to audition your camera settings, lighting and materials, etc. as you go), along with setting up your color mapping, and let it render until the noise level is acceptable to you. The longer it goes, the better it looks!

Hope this helps,

-Alan

[3dvizual]

OK. So you don't tweak anything in RT other than the standard settings.?

Size of texture, etc. ?

It seems to me that many of my old scenes cannot be rendered with RT. I get errors from my nvidia drivers and then the image looks strange with wrong pixelation.

I don't have this problem with smaller scenes, but my scenes with 100-200mb, won't render properly.

Have you had this problem.?

[Alan Iglesias]

Hi Martin,

Sizes of textures follow the same rules as normal rendering - use a size large enough for your particular rendering's resolution. The size of the maps sent to the GPU can also be globaly controlled in the Vray RT Render Settings for RAM concerns.

I have been able to fix driver related problems by changing out the drivers. For my GTX 580s, the 290.36 driver is working very well.

At this point in time, I don't think I'd advise dumping a large, complex scene designed to render perfectly in Vray Advanced directly into RT/GPU and expect instantly good results. As you have seen, there are still some differences in the renderers. This will most likely change in time.

What I have been doing is designing and converting scenes to work well with RT/GPU, checking things as I go and ensuring that everything is looking good as the scene is created or converted.

Yes, it can be some work to convert a large scene to be GPU-compatible, but I find that it can often be completely worth the effort as the rendering speed can be so incredibly fast relatively speaking. And building a scene from scratch for GPU is extra fun because of all the instant feedback as you go.

As an example, I recently converted the below technical rendering from Mental Ray to Vray RT/GPU. I think the GPU part of the conversion only took a few hours if that. For referrence, the file ended up being 347 MB and had 3.6 million faces.

The file, rendered with "higher" bias and sampler settings in Vray Advanced at 1920x880 res, took a single i7-based machine 33 minutes and used 6GB of physical RAM. The exact same shot rendered in RT/GPU (see below) took just over 5.5 minutes on two GTX 580s (1024 fermi cores). The noise was fairly acceptable (I might have let it go for another minute or so to lessen noise in the shadows...) and the GPU reported only 1.6GB GPU RAM used for the rendering.

I hope this is informative,

-Alan

[3dvizual]

Thank you for your very good answer.

I will follow you advice.

[Alan Iglesias]

Most welcome!

-Alan