Red Shadows

[Streetwise]

I'm having an issue with a material in that I'm getting red shadow areas. I've rendered the scene with two other darker materials with no issues, so I can't imaging it's anything with lighting. In fact, if you look at the gap between the two file drawers, you'll see it there. The material itself is nothing fancy - just a bitmat in the diffuse slot. I'm using the default BF/LC setup with 3.40.02

Any ideas as to what's going on?

[Macker]

That looks like there's a non-vray material in the scene?

[Streetwise]

Is there an easy way to find that? Or is it better/easier just to fire up V-Ray scene converter?

Edit: I just ran scene converter, but no difference to output.

[Laserschwert]

Isn't that just how Lightcache works? It usually produces quite saturated shadows. As a test you could use BF instead of LC for the secondary GI, see if that fixes it.

[Streetwise]

Isn't that just how Lightcache works? It usually produces quite saturated shadows. As a test you could use BF instead of LC for the secondary GI, see if that fixes it.

BF/BF didn't do anything either except slow the render WAY down... What DID seem to help however, was to turn GI Saturation from 1.0 to .5 This made a big difference, but I'm not sure if that's the "right way" to fix it? Even though the color is less noticeable, the shadows are still "reversed" in that they are actually lighter in some spots.

[padre.ayuso]

I wonder if you try using override material and put a white material as GI override and see if that handles it. It may just work, at which point you have at least worked out what the problem is and maybe a solution can be arranged from there.

[piotrus3333]

looks like your lighter material is just way to bright. resulting in producing too much gi. what are the rgb values on this bitmap?

[Streetwise]

looks like your lighter material is just way to bright. resulting in producing too much gi. what are the rgb values on this bitmap?

They are 235, 193, 144. I'll have to try colorcorrect and maybe darken a bit, and then bring the levels back up in post. I'd rather keep it fairly simple whatever the fix may be.

[piotrus3333]

too high imho. I consider 160 good value for simple white interior wall. and that wood is darker than white wall. and it is fairly simple: correct input gives you correct result.
what does your color mapping look like?

[piotrus3333]

by 160 I mean color directly in color swatch of VRayMat diffuse. it will be higher if that would be texture used in diffuse slot - gamma corection.
If you don't like to be bothered by math prepare 3 simple gray VRay materials in editor slot: rgb 56 (half gray), 160 (white interior wall) and 185 (common white paper) and use those as reference for brightness of your shaders. Than use rgb multiplier and/or curve in output section of max's bitmap leader.

[Deflaminis]

Any chance the xform is way off? Maybe reset it?

[Streetwise]

too high imho. I consider 160 good value for simple white interior wall. and that wood is darker than white wall. and it is fairly simple: correct input gives you correct result.
what does your color mapping look like?

I think you've hit on the issue. I put a Color Correction on the material and turned the brightness and saturation down by 25%, Contrast down 10%. WAY better. I don't seem to have any of those issues. Since I'm outputting to 16-bit, I was easily able to then "pull" the material levels back up to the RGB values of the swatch without issue. Thanks.

[piotrus3333]

now with darker diffuse colours you can boost the lights to get previous exposure.
I'm glad I could help.