komyali Posted September 23, 2014 Share Posted September 23, 2014 Facade on this object (picture from Tokyo) have distorted reflection, I am not sure what is the reason of this, maybe vacuum between glass panels or pressure of expanding gases... Do you predict this in your 3D-s or leave flat panel with reflection? Link to comment Share on other sites More sharing options...
Nicolai Bongard Posted September 24, 2014 Share Posted September 24, 2014 Glass is never completely planar. When you look at windows of really old buildings you can sometimes see the "melting" effect very clearly. For added realism you should either distort the geometry of your windows a bit or add a bump map. Link to comment Share on other sites More sharing options...
Ismael Posted September 24, 2014 Share Posted September 24, 2014 http://forums.cgarchitect.com/28209-refraction-exterior-glass-windows.html Link to comment Share on other sites More sharing options...
Francisco Penaloza Posted September 24, 2014 Share Posted September 24, 2014 http://forums.cgarchitect.com/28209-refraction-exterior-glass-windows.html Hey that website is very informative it has all the questions related to arch viz!! just a little search and bingo! Link to comment Share on other sites More sharing options...
komyali Posted September 24, 2014 Author Share Posted September 24, 2014 Ok I see that, but what is the reason for that? I just watched One World Trade Center, also have distorted reflection... I will use bump map Link to comment Share on other sites More sharing options...
Devin Johnston Posted September 26, 2014 Share Posted September 26, 2014 I was told that it all has to do with how the glass is installed in the frame, unless it's perfect the sheet of glass will be twisted or compressed causing it's surface to deform. Link to comment Share on other sites More sharing options...
komyali Posted September 26, 2014 Author Share Posted September 26, 2014 Yes that is one of reasons, if workers dont do their job. But I think main reason is different pressure between outside and inside, you can find on youtube. OTC is built to perfection and again you can see small distortions... It is normal, also you have standards how much one building can have glass distortion. Link to comment Share on other sites More sharing options...
carlotristan3d Posted September 27, 2014 Share Posted September 27, 2014 I was told that it all has to do with how the glass is installed in the frame, unless it's perfect the sheet of glass will be twisted or compressed causing it's surface to deform. Reflected distortion is an inherent characteristic of glass, more with the processing rather than installation. There are many variables that contribute to this: airspace, thickness, coating etc. This is one issue in specifying glass, how much distortion is acceptable? Suppliers will have different answers, but I'm fine with distortion- I think it adds to the beauty of the building. If every reflection is perfect, reality would look like a 3d rendering. Link to comment Share on other sites More sharing options...
Nic H Posted September 28, 2014 Share Posted September 28, 2014 i predict this in my 3D use a bulge map on each pane or a material by element with a few different noises Link to comment Share on other sites More sharing options...
Chris MacDonald Posted September 29, 2014 Share Posted September 29, 2014 The "large" bulges in glass that you see are due to pressure differences between the interior and exterior of the building. The smaller, noise like distortions that you see are down to very small imperfections in the manufacturing process. Ramy Hanna did the best tutorial to date on this, afaik. The problem with just using noise is that unless you change the UV coordinates on each pane of glass, you end up seeing noise "flowing" from one window pane to the next, which isn't how it works in real life. Link to comment Share on other sites More sharing options...
komyali Posted October 7, 2014 Author Share Posted October 7, 2014 (edited) I have in cad detail of that building with two layers of glass between is argon. Do you create one plane and imitate two layers of glass with material or create two planes with ticknes of glass? Is it worth creating more complex model for this detail ? Edited October 7, 2014 by komyali Link to comment Share on other sites More sharing options...
Chris MacDonald Posted October 9, 2014 Share Posted October 9, 2014 I never use a plane for glass, as it has no thickness. Always give your glass a thickness. If you want to go for photoreal, then yes sometimes it is worth modelling the double glazing as you do get some nice double reflections; but it's only worth doing if you're going to see it. Link to comment Share on other sites More sharing options...
komyali Posted October 9, 2014 Author Share Posted October 9, 2014 Tnx. That is what I need Link to comment Share on other sites More sharing options...
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