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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 Melkert341August 25, 2013 12:45PM
Re: OpengGL color / material properties Ben Supnik144August 25, 2013 03:33PM
Re: OpengGL color / material properties Roland Melkert133August 25, 2013 04:27PM
Re: OpengGL color / material properties Travis Cobbs143August 26, 2013 01:12PM
Re: OpengGL color / material properties Roland Melkert157August 26, 2013 03:59PM
Re: OpengGL color / material properties Roland Melkert140September 03, 2013 09:47AM
Re: OpengGL color / material properties Travis Cobbs136September 03, 2013 12:26PM
Re: OpengGL color / material properties Roland Melkert142September 04, 2013 11:45AM
Re: OpengGL color / material properties Ben Supnik141September 03, 2013 01:07PM
Re: OpengGL color / material properties Roland Melkert142September 04, 2013 11:49AM
Re: OpengGL color / material properties Ben Supnik156September 04, 2013 07:02PM
Re: OpengGL color / material properties Roland Melkert118September 05, 2013 09:32AM
Re: OpengGL color / material properties Steffen148September 05, 2013 02:08PM
Re: OpengGL color / material properties Ben Supnik116September 05, 2013 07:33PM
Re: OpengGL color / material properties Travis Cobbs105September 06, 2013 09:52AM
Re: OpengGL color / material properties Steffen113September 06, 2013 12:26PM
Re: OpengGL color / material properties Steffen111September 06, 2013 12:27PM
Re: OpengGL color / material properties Travis Cobbs124September 06, 2013 01:07PM
Re: OpengGL color / material properties Ben Supnik149September 06, 2013 02:14PM
Re: OpengGL color / material properties Travis Cobbs179September 06, 2013 02:46PM
Re: OpengGL color / material properties Ben Supnik174September 06, 2013 05:04PM
Re: OpengGL color / material properties Travis Cobbs151September 06, 2013 07:30PM
Re: OpengGL color / material properties Ben Supnik193September 07, 2013 05:16PM
Re: OpengGL color / material properties Allen Smith129September 05, 2013 10:03AM



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