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Re: OpengGL color / material properties
September 04, 2013 07:02PM
Hi Roland,

I've been thinking about some kind of bump mapping, e.g. for the rough surface on the angled side of slope bricks. I see two possible problems:

1. I don't think the slope bricks actually notate their angled side as smooth and the flat sides as rough. (Is there a tag or meta data I don't know about here?)

2. Most of the time the 'grain' of the bump mapping will be much smaller than screen pixels, so to look good the bump mapping scheme and specular lighting equation have to minify. LEAN mapping (http://www.csee.umbc.edu/~olano/papers/lean/) is a good candidate here - it copes with mipmapping nicely and for a few 'reference' materials, the extra VRAM costs are quite affordable.

From what I can tell from the bricks I have in my office, there is some subtle variation in the normal directions of 'smooth' sides of bricks, and possibly the edges of the bricks are beveled. Does anyone know of a write-up on the micro-level details of lego bricks? (I know lego is famous for their mold precision, so I have to think that someone is paying attention to such details.) These would matter to a high-quality render because they 'bend' reflections and (in the case of edges) sometimes catch bright lights.

Cheers
Ben
SubjectAuthorViewsPosted
OpengGL color / material properties Roland Melkert408August 25, 2013 12:45PM
Re: OpengGL color / material properties Ben Supnik183August 25, 2013 03:33PM
Re: OpengGL color / material properties Roland Melkert163August 25, 2013 04:27PM
Re: OpengGL color / material properties Travis Cobbs180August 26, 2013 01:12PM
Re: OpengGL color / material properties Roland Melkert214August 26, 2013 03:59PM
Re: OpengGL color / material properties Roland Melkert185September 03, 2013 09:47AM
Re: OpengGL color / material properties Travis Cobbs183September 03, 2013 12:26PM
Re: OpengGL color / material properties Roland Melkert182September 04, 2013 11:45AM
Re: OpengGL color / material properties Ben Supnik203September 03, 2013 01:07PM
Re: OpengGL color / material properties Roland Melkert186September 04, 2013 11:49AM
Re: OpengGL color / material properties Ben Supnik202September 04, 2013 07:02PM
Re: OpengGL color / material properties Roland Melkert164September 05, 2013 09:32AM
Re: OpengGL color / material properties Steffen188September 05, 2013 02:08PM
Re: OpengGL color / material properties Ben Supnik148September 05, 2013 07:33PM
Re: OpengGL color / material properties Travis Cobbs135September 06, 2013 09:52AM
Re: OpengGL color / material properties Steffen150September 06, 2013 12:26PM
Re: OpengGL color / material properties Steffen136September 06, 2013 12:27PM
Re: OpengGL color / material properties Travis Cobbs160September 06, 2013 01:07PM
Re: OpengGL color / material properties Ben Supnik177September 06, 2013 02:14PM
Re: OpengGL color / material properties Travis Cobbs217September 06, 2013 02:46PM
Re: OpengGL color / material properties Ben Supnik219September 06, 2013 05:04PM
Re: OpengGL color / material properties Travis Cobbs202September 06, 2013 07:30PM
Re: OpengGL color / material properties Ben Supnik253September 07, 2013 05:16PM
Re: OpengGL color / material properties Allen Smith176September 05, 2013 10:03AM



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