My first shot at VRay...HELP!!!

[tcupp]

Here is my first stab at VRAY. I am doing a rendering of an installation at my school and I am making the whole room gray with the installation (not yet in the image) color. I thought I would run some test renders of just the room to see what issues I might have with my first stab at a VRay render.

So, As you can see from the image I get blotchy grey on my surfaces. Any suggestions. I went through the Vray Osmosis tutorial that a lot of people have suggested for my basic setup of the scene. Thanks in advance for any help.

Taylor

[AJLynn]

What are your GI settings? And bucket settings - looks like you've got some artifacting from that.

[tcupp]

http://www.taylorcupp.com/CGArch/GI.jpg

http://www.taylorcupp.com/CGArch/Bucket.jpg

 

I snapped a couple of screen shots that show the GI and Irradance Map. Hope its the info that you were refering to. I still don't quite understand what these settings do but I didn't modify them from what they were set at in the Osmosis tutorial.

[AJLynn]

Try medium irradiance map but with more hsp subdivs and interp samples (see what happens if you double both numbers) and change from bucket mode to single frame, and light cache for secondary with multiplier at 1.0 and an extra pass or two - those are guesses, experiment a bit. You might also try density-based instead of quad-balanced, but I think the biggest factors here are probably the bucket mode (square grid artifact) and the photon map (blotches). Since it's a deep space with sunlight from one side, lowering the secondary multiplier probably isn't going to be helpful. If you really want the photon map you'll need to increase its settings a lot, but I don't usually use it - it tend to be blotchy and/or slow.

[tcupp]

 

I got it looking halfway descent with the suggestions that you made. A little dark but I can fix that with what I know now. It is to the level that I need to move on to adding the rest of the scene and interior lights but there are a few light leaks around the windows. What causes this? It there an easy fix?

[AJLynn]

There are some different things that can cause that - insufficient GI sampling maybe, or a problem in the model itself. Is everything connected up? You need to have the parts line up without having any polygons occupy the same space (that causes dark patches in the GI). In some situations the easiest thing to do is put more geometry in between the wall planes that blocks the light and sometimes you can get away with making non-coplanar polygons intersect.

 

Is this an Autocad import? There are people here who know that stuff way better than I do.