SCSIx Posted February 13, 2006 Share Posted February 13, 2006 Hi All, This is my first posting hop it helps, I am having hard time working with vray, I have an interior design project for a client. My problem with the lighting system of vray I am using ERCO light’s in my scene and it seems that I can’t get the bouncing effect on the ceiling. When using vray default lighting it works fine but with the ERCO system it show very dark ceiling!!!..radiosity dosnt work with vray !!!! … Please help (attached the vray.jpg and erco.jpg) Abraham Link to comment Share on other sites More sharing options...
gfa2 Posted February 13, 2006 Share Posted February 13, 2006 What do your settings look like? Link to comment Share on other sites More sharing options...
Joseph Petrino Posted February 13, 2006 Share Posted February 13, 2006 Also consider turning up your light multipliers. I use photometric lights a lot and 400% is not uncommon. Link to comment Share on other sites More sharing options...
Christopher Nichols Posted February 13, 2006 Share Posted February 13, 2006 Also make sure you are applying a gamma correction to your image and not displaying it in linear space. Link to comment Share on other sites More sharing options...
Fran Posted February 13, 2006 Share Posted February 13, 2006 Chris, if gamma correction was the problem, wouldn't it be a problem with the vray lights too? Generally, With my experiences using both Vray and radiosity, it is generally not necessary to up the multipliers for photometrics with radiosity. Spot lights are "stubborn" in Vray from my experience. I'm not comfortable whacking out the multipliers if an architect or interior designer is interested in seeing a realistic representation of the room's lighting design. Link to comment Share on other sites More sharing options...
SCSIx Posted February 13, 2006 Author Share Posted February 13, 2006 Thanks all for the reply, I agree with Fran it seem vray doesn’t do any lighting calculation on the ceiling! It tweaked the multiplier to 400% and that’s what I got Link to comment Share on other sites More sharing options...
Christopher Nichols Posted February 13, 2006 Share Posted February 13, 2006 Thanks all for the reply, I agree with Fran it seem vray doesn’t do any lighting calculation on the ceiling! It tweaked the multiplier to 400% and that’s what I got OK try this... Set your color mapping to gamma correction and set the bright multiplier to 0.4545 The reason that you don't see it in the vray lights is that the falloff is softer overall with area lights so that super hot core and quick falloff is not as apparent as it would be with point lights like the IES spotlights. I have done a lot of experimenting with this, and generally speaking, when doing interiors you need to make sure that you are viewing your results in the correct gamma corrected space, or you have issues just like this. In terms of Frans response about multipying the IES lights, she is right but generally there is no real exposure (like in radiosity) for that so if you want to be a purist you would have to render to an HDR format like HDRI or EXR and expose up using that. Also, if you did render to HDR or EXR you would not need the gamma correction. I cover that in my DVD. Link to comment Share on other sites More sharing options...
AJLynn Posted February 13, 2006 Share Posted February 13, 2006 radiosity dosnt work with vray !!!! Were you trying to use radiosity with Vray? That wouldn't work. I tried gamma correcting your image in Photoshop and the ceiling was still black, and the render time suggests little or no GI calculation. What are your GI settings? Link to comment Share on other sites More sharing options...
Aksel Posted February 21, 2006 Share Posted February 21, 2006 ies lights, especially spots, tend to bring a lot of energy to a small area. in my experience there is no way to get the image straight than to use max exposure controls. i know... ouch. anyway, either that or render an exr and make sure you are experienced correcting that one. i still find pshop cs2 has not enough tools for correcting float, so i often use exposure control even if it hurts a little. but ok, the image you get is nice, and thats all that counts in the end. a. ps: oh, just saw you are asking vray specific - then try vray exposure controls, from what i saw they are superiour to what you find built in in max. Link to comment Share on other sites More sharing options...
Realmind Posted August 4, 2006 Share Posted August 4, 2006 I have the same problem with my scene too!I think that vray has some difficulty with IES lights.but I agree with Chiristopher Nichols because I have seen his useful DVD about vray.It is perfect!but I think that mental ray is better for work with IES lights.It can produce very clear picture in this field.you can test it! Link to comment Share on other sites More sharing options...
Aksel Posted August 4, 2006 Share Posted August 4, 2006 This might seem too obvious and i am sure everyone thought about this and did this - don't ever use IES lights *without* setting the falloff to inverse square as in the real world. Link to comment Share on other sites More sharing options...
sya Posted August 5, 2006 Share Posted August 5, 2006 hai. im sya from malaysia..my question is where i can get ERCO IES LIGHTING??? i try to open ERCO WEBSITE but i can't find the ies to download!!!!!! pleased help me.... Link to comment Share on other sites More sharing options...
Aksel Posted August 5, 2006 Share Posted August 5, 2006 http://www.erco.com/~klickmeister/km_ls_download/ls_download.pl?_startseite=en=40_planning_luminaire/63_max Link to comment Share on other sites More sharing options...
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