Guest nazcaLine Posted March 20, 2006 Share Posted March 20, 2006 do you use linear exposure in exteriors with vray? i get overburnt areas with linear, and areas in shadow are very dark. i changed it to hsv exponential but the image is ugly undersAturated, "washed out".hsv works great for interiors, but in exteriors not really. here are two images for you to compare. i'd like you to help me with this, do you use only linear exposure in exteriors? and if so, how do you deal the overburnt areas and the dark shadows? please help!!! Link to comment Share on other sites More sharing options...
darth Posted March 21, 2006 Share Posted March 21, 2006 hi! have you tried playing with dark mult. try lover his value, I'm not sure but it will maybe help. cheers! Link to comment Share on other sites More sharing options...
Hao La Posted March 21, 2006 Share Posted March 21, 2006 I always use Exponential type Link to comment Share on other sites More sharing options...
jeffreyy Posted March 21, 2006 Share Posted March 21, 2006 it depends on your scene.. sometimes you got good results by using exponential sometimes by using linear. Link to comment Share on other sites More sharing options...
anvaraziz Posted March 21, 2006 Share Posted March 21, 2006 take a look on the diff between each color mapping,. LINK Link to comment Share on other sites More sharing options...
Guest nazcaLine Posted March 21, 2006 Share Posted March 21, 2006 I always use Exponential type i tried using exponential but it desaturates the colors so much...how do you deal with this?? and how could i fix the overburnt areas if use linear?? Link to comment Share on other sites More sharing options...
diegofer_9 Posted March 21, 2006 Share Posted March 21, 2006 There is a huge thread on the vray forum at chaosgroup and it seems that linear is ideal to reproduce exterior lighting. I ve tried it and it works great but you also have to do some gamma correction to 3DMAX. Using exponential or other kind of color mapping is like correcting the gamma ( you get more light in dark areas) but it can add up a few extra minutes to render time, IMHO. It also depends on the look that you are after. Link to comment Share on other sites More sharing options...
diegofer_9 Posted March 21, 2006 Share Posted March 21, 2006 Eduardo, I am definetly no vray expert but this was my experience yesterday when using linear for an exterior: 1. Go to customiza/preferences and set the gamma to 2.2, the input gamma for bitmaps 2.2 (so they dont look washed out) and the output gamma leave it to 1.0 2. Use gamma color mapping DM: 1 and BM: 0.45454 (this makes the image sow in linear space, meaning that it matches your gamma settings) This way you will get a lot of light in dark areas by using very little light, so render times are a little faster. All these are my notes from the forum at chaosgroup so there are experts there that came up with this settings. Hope it helps Link to comment Share on other sites More sharing options...
Guest nazcaLine Posted March 21, 2006 Share Posted March 21, 2006 hey diego thank you very much man i'll try what you suggest, let's see what happens. i always heard about gamma correction but had no idea what it is i´ll find out more, bye. Link to comment Share on other sites More sharing options...
C.Vestal Posted March 21, 2006 Share Posted March 21, 2006 If you have not....get Chris's DVD. Gnomon Workshop GI Exteriors Worth every $ Link to comment Share on other sites More sharing options...
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