How Do I Decrease Discoloration Due to GI?

[Marshall_Craft]

Hi, I am extremely new to Vray and to this post, and I am hesitant to post something which must seem remedial to most of you, but I can't find threads on my problem (I probably just don't know the correct Vray terminology to search for.) Anyways, I have an interior scene with many light fixtures and wood flooring. I'm using an IR map for GI, and the scene looks "okay" but too much of the flooring color is being transmitted to the ceiling tiles. I need the light to reflect back up to the ceiling, but how can I just diminish the amount of color being transferred? Is it a setting on the material, the object, or in the render settings? Or, if this is a dumb question which newbies ask all the time, what term should I search for to get the information on my own? Thanks, and I've been extraordinarily impressed by the work posted in this forum.


http://discussion.autodesk.com/servl...5-89293/Video%

- Alex

[natty]

Hi Alex and welcome to the forum ..
The quickest way to solve your problem is to decrease the saturation levels in the Indirect Illumination roll out section. The other way to do it is to right click on the object and go to Vray properties and decrease the amount of send GI or you could put a vray material wrapper over the top of the material that is emmiting to much gi and decrease the gi values.

Hope this helps

Also what lights are you using in there ... the whole image looks to saturated?

[Marshall_Craft]

Okay, someone from the Autodesk VIZ forum responded to a message I posted there, and I see that all I need to do is lower the saturation level in the Indirect Illumination box. Now, is there any way to adjust the (de)saturation at the object or material level so that the whole scene doesn't get muted? Also, this is for a video; not sure if I mentioned that. Thanks all.

- Alex

[natty]

Read my post again ..

[Marshall_Craft]

you beat me to the answer. the lights are standards (a combination of omnis, directional, and spotlights.) i haven't really mastered Vray Lights yet, but i'm sure there's a thousand things in this scene that professionals would laugh at (if not scream and yell too.) I looked in the help index online for information on the Vray Light Mtl, but there's nothing there. Does the material actually EMIT light, or is it similar to an advanced lighting override? The curved lighting fixture on the left should have tubular fluourescent bulbs, but after making a simple tube object, i could simply make it emit light, so i gave up and added way too many lights to simulate the effect (without great success.) please, any suggestions and criticism would be greatly appreciated. i feel like most people in this forum are lightyears ahead of me in modelling and rendering, so i don't want to dumb down the forum. okay, thanks. later.

- Alex

[3ddesign]

Alex,

Glad you decided to post in this forum. You'll find that the people here are actually very nice to newbies (I still feel like one).

Regarding your image. I'd check your floor map in PhotoShop. It looks very saturated which would account for the oversaturation on your ceiling. Since this is for video, pay particular attention to the amount of red in the map. Actually, all your materials seem on the overly saturated side.

Experiment with the Vray Light Material. It is actually very simple and works great. I don't know how it works technically but it appears to emit light.

Craig

[percydaman]

also dont forget theres the saturation spinner in the Indirect Illumination rollout. Try changing it from 1.0 to .7 and see how it changes.

[Marshall_Craft]

Thanks for not killing the newbie, and I lowered the saturation spinner under Indirect Illumination, and the scene is already coming out better. This is a little off the topic that I originally posted, but I remember reading somewhere (just can't remember where) that there's something I need to do under my Vray settings if I have employ a camera correction modifier to my moving camera. I will try desaturating the maps I'm using in my flooring material. Thanks for the advice guys; it's a start at least.

- Alex

[percydaman]

ya uncheck the shade context button in the system rollout when using camera correction.

[Marshall_Craft]

perfect, if you guys would compile your knowledge and tips and tricks for beginners (or people who are somehow less than beginners...) then i know i'd buy it. is there a comprehensive Vray Manual somewhere? I've seen the help index which was good, and the tutorials were helpful too. okay, thanks again guys.

- Alex

[percydaman]

you can always go to www.vray.info

[Marshall_Craft]

hmm, had no idea that existed. cool, very cool. alright, i'm done badgering you guys for today. thanks.

- Alex

[PixelJockey]

And color mapping will also affect the color/saturation. For interior scenes, I find that Linear Multiply produces a little too much contrast. Give the other modes a try. You'll probably have to tweak your light settings when you switch to a different color mapping scheme.

[Marshall_Craft]

hmm, color mapping is a new term to me, but i'll look into it. Thanks for the advice.

- Alex