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How to lengthen specular reflection ?


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#1 BlackBrain   Members   -  Reputation: 313

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Posted 08 April 2014 - 08:17 AM

Hello everyone.

I took a look at Unrea Engine paper and I see a picture that it was called specular D modification. I didn't find anything on how to achieve the effect .

Here's a shot :  http://uploadax.com/images/28835413724170240386.jpg

I want to know how is it possible to create that effect ? Actually lengthen the specular part ?



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#2 MJP   Moderators   -  Reputation: 10909

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Posted 08 April 2014 - 03:01 PM

I believe that the older "area light" stuff they presented back then isn't actually used anymore. It was a really rough approximation, and their specular model in general had a few problems. If you go with a "standard" microfacet BRDF with proper D + G + F terms, you should get "lengthy" reflections without doing any special work. You can look at my course notes from SIGGRAPH for an example of a GGX-based microfacet specular model, and you can also look at Brian Karis's course notes from the same course to see a more recent update on what they're doing for UE4.






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