Splotchy light in corners

[cgarness]

Splotchy light in corners

I took all your suggestions Damien and re-rendered. The changes did make for a shortened rendering time (10.5 hours) but as you can see by the linked image, there is still more tweaking that must be done. Even though now there are fewer light leaks in the corners there is a noticable splotchiness to the wall surfaces and a weird "its-made-of-stars" effect going on in the glossy floor reflection.

http://picasaweb.google.com/ggarness...34954974439570

Since I have a Friday deadline for 3 renderings, I will go ahead and render the model with emitters and photoshop the light leaks away. But I would like to figure out what settings will eliminate these problems for future reference.

Thanks,

Gunnar

[joe_b]

Splotchy light in corners

So I dumped out a debug scene file and it seems there are well over 100 rect lights being created in your scene. That will account for your horrendous render times. Overall your scene is not that complex - < 100k faces, settings are fine. But that rect light issue is a killer. I'm not sure if you explicitly put all these lights in or if there is some error on my scene parsing (I'm leaning toward the latter). I'll keep you posted...sorry for the inconvenience.

[cgarness]

Splotchy light in corners

Each face of those wall sconces is a rectangular light and there are 8 per bay plus 8 rectangles on the tops and the bottoms of each of the 7 or so ceiling pendants... so 100 plus lights doesn't sound unreasonable to me.

There are so many of them because I didn't know any better way to simulate the effect of diffuse square fixtures. Maybe there is a better way to form the lights in sketch up/vray so there aren't so many individual faces?

Gunnar

[dalomar_cg]

Splotchy light in corners

Joe sent me your scene, so I will take a look at it. I'll see if there's anything else that pops up as well as try to create that effect with less lights.

[joe_b]

Splotchy light in corners

Ok - then perhaps you might want to hide portions of the model that aren't in the rendering. Damien may be able to provide you with more tips. But that many area lights will slow any renderer down to a crawl. I would also avoid using light cache for interior scenes. Maybe IM/QMC would be a better choice for interiors - do you agree Damien?

[cgarness]

Splotchy light in corners

Good idea about turning off lights that are more or less out of range of the scene. I'll try it... although having to manage three different sets for 3 different scenes sounds like a real chore.

But once yall get the lights-inside-a-component-issue worked out that should be easy.

Thanks, Gunnar

[joe_b]

Splotchy light in corners

heh - yep..that was a pretty big oversight

[dalomar_cg]

Splotchy light in corners

You may also what to try to enable the Store with Irradiance map option on all of the lights. What this does is that the direct light becomes calculated with the irradiance map as opposed to simple ray tracing which is much faster. Usually the direct light from any given light is calculated during render time based on the number of subdivisions from the light. This means that on top of the material sampling and antialiasing that is done Vray is also tracing rays from the lights themselves. With a few lights this may not have an incredible impact, but with a large number (like you have) it should be a very significant amount of processing time that it would take.

[cgarness]

Splotchy light in corners

Thanks. I'll give that a try tonight and see what the difference it makes in rendering time.

Gunnar