thacabbagekid Posted March 21, 2011 Share Posted March 21, 2011 I have a glass material and want to see shadows on the glass. But for some reason i cant seem to get any. I think I have the right balance between reflective and refractive but i dont see any shadows casting on the glass. does anyone have any ideas why? thanks Gareth Link to comment Share on other sites More sharing options...
Stephen Thomas Posted March 21, 2011 Share Posted March 21, 2011 Hey Gareth, how's the new life in Poland? All good I hope! You'll need a combination of some amount of diffuse colour in your glass material as well as making sure it's not fully refractive in order to see shadows on the surface. Try increasing the value of your diffuse colour slot to about 40 as a starting point and make sure your refraction value isn't full white either, maybe around 220 or so, with fresnel falloff. Link to comment Share on other sites More sharing options...
thacabbagekid Posted March 21, 2011 Author Share Posted March 21, 2011 Hey Gareth, how's the new life in Poland? All good I hope! You'll need a combination of some amount of diffuse colour in your glass material as well as making sure it's not fully refractive in order to see shadows on the surface. Try increasing the value of your diffuse colour slot to about 40 as a starting point and make sure your refraction value isn't full white either, maybe around 220 or so, with fresnel falloff. Hi stef. im good thanks hows u?. its all hands on the pump over here mate. i have a frensel reflection on and ior is set to 4 the diffuce colour is a grey blue, reflection is 150 and refraction is about 255 (so will change that.) when you say change the diffuse colour to 40 do you mean 40 grey? or blue? Link to comment Share on other sites More sharing options...
thacabbagekid Posted March 21, 2011 Author Share Posted March 21, 2011 stef just been trying it out and looks much more like what i want thanks mate!!! Link to comment Share on other sites More sharing options...
thacabbagekid Posted March 21, 2011 Author Share Posted March 21, 2011 acctually the reflections are too strong and not seeing enough inside. starting to look too much like a mirror. where do you rekon to put the fall off? in the refraction slot? Link to comment Share on other sites More sharing options...
Stephen Thomas Posted March 21, 2011 Share Posted March 21, 2011 You won't need a falloff if you have the fresnel box ticked. If you're using fresnel then try decreasing your IOR, 4 is pretty high. If you're not using fresnel then the IOR won't matter and you just need to decrease your reflection value. Link to comment Share on other sites More sharing options...
thacabbagekid Posted March 21, 2011 Author Share Posted March 21, 2011 the reason the frensel is so high was to get a more brighter and intense look of the clouds and sky cause without it the glass looks really dull Link to comment Share on other sites More sharing options...
Stephen Thomas Posted March 21, 2011 Share Posted March 21, 2011 It's just a balancing act from here. Unfortunately you can't have strong reflections, shadows on the glass and be able to clearly see inside. Each thing you change has an effect on the others. Link to comment Share on other sites More sharing options...
thacabbagekid Posted March 21, 2011 Author Share Posted March 21, 2011 It's just a balancing act from here. Unfortunately you can't have strong reflections, shadows on the glass and be able to clearly see inside. Each thing you change has an effect on the others. yeah i know thats why im running around in circles one result looks god and the other that looked good is now not so good. anyway thanks for the help stef. Link to comment Share on other sites More sharing options...
ihabkal Posted March 21, 2011 Share Posted March 21, 2011 glass as a material doesn't receive shadows by itself. another method is to add shadows in post. Link to comment Share on other sites More sharing options...
thacabbagekid Posted March 22, 2011 Author Share Posted March 22, 2011 glass as a material doesn't receive shadows by itself. another method is to add shadows in post. yeah thats what i was thinking. it might be the only way to find the right balance. Link to comment Share on other sites More sharing options...
Iain Denby Posted March 22, 2011 Share Posted March 22, 2011 Ihab is correct - glass doesn't receive shadows. It sometimes looks like it does, but usually you're looking at shadows cast onto the dirt on glass, blinds directly behind the glass etc, or reflections from overhangs which often fall in line with where the shadows would be. Link to comment Share on other sites More sharing options...
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