Zdravko Barisic Posted January 16, 2006 Share Posted January 16, 2006 I've been looking for this answer for almost 2 months but I did find NOTHING, well: -If I have new max scene with international units Vray assume that is metars or centimetars? -If I have one Direct Light what is its candellas or Lux units? (or Vraylight instead of it?) ... ... So what are Vray primary units? Its so confusing working with "unitless" program, isnt it? Link to comment Share on other sites More sharing options...
Christopher Nichols Posted January 16, 2006 Share Posted January 16, 2006 Vlado wrote something about that: http://www.chaosgroup.com/forum/phpBB2/viewtopic.php?t=9157 Link to comment Share on other sites More sharing options...
AJLynn Posted January 16, 2006 Share Posted January 16, 2006 Wow, half the people on that thread are incredibly confused But after sifting out the confusion there's very helpful info in there. The way I read it is basically, Vray assumes you're in meter and if you normalize the lighting intensity the unit is watts. Convert lumens to watts by multiplying by 0.0015, and keep in mind that you might actually be working in watts per square meter if you're using VrayLights. (Is that correct?) Link to comment Share on other sites More sharing options...
Clifton Santiago Posted January 17, 2006 Share Posted January 17, 2006 Sounds good. I started to answer this question yesterday only to realize I had no idea... I read that thread a while ago, and couldn't follow it. Link to comment Share on other sites More sharing options...
Christopher Nichols Posted January 17, 2006 Share Posted January 17, 2006 Wow, half the people on that thread are incredibly confused But after sifting out the confusion there's very helpful info in there. The way I read it is basically, Vray assumes you're in meter and if you normalize the lighting intensity the unit is watts. Convert lumens to watts by multiplying by 0.0015, and keep in mind that you might actually be working in watts per square meter if you're using VrayLights. (Is that correct?) Yeap.. sounds correct... to be brutally honest, since vray does not really have exposures like the radiosity engine, I just light it until it seems correct. I only care about the intensity relative to the other lights. But I work differently than you guys. Link to comment Share on other sites More sharing options...
AJLynn Posted January 17, 2006 Share Posted January 17, 2006 Yeap.. sounds correct... to be brutally honest, since vray does not really have exposures like the radiosity engine, I just light it until it seems correct. I only care about the intensity relative to the other lights. But I work differently than you guys. I'm with you on that - I'm not likely to be using Vray for accurate lighting simulation, and I'm used to the non-normalized units - I find it pretty easy to eyeball a situation and say "that should 3 0.5's on that side" etc., and not miss exposure control. But it's nice to know that if it really needs to be a 100W light bulb, that's possible. Link to comment Share on other sites More sharing options...
Guest ffshark80 Posted August 15 Share Posted August 15 V-Ray typically works with meters for scene units and uses watts for lighting intensity. To convert lumens to watts in V-Ray, you can use a conversion factor of about 0.0015. For more details on converting between lumens to watts, check out this blog: Lumens to Watts Conversion Chart for LED Bulbs Link to comment Share on other sites More sharing options...
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