Comments on: Ambient occlusion http://aras-p.info/blog/2005/03/02/ambient-occlusion/ Random thoughts of a triangle pusher Wed, 07 Jan 2009 13:00:52 +0000 http://wordpress.org/?v=2.7 hourly 1 By: NeARAZ http://aras-p.info/blog/2005/03/02/ambient-occlusion/comment-page-1/#comment-14 NeARAZ Fri, 04 Mar 2005 12:36:00 +0000 http://aras-p.info/blog/?p=17#comment-14 Not really.<br /><br />AO is basically calculating how much each point on some surface is "open" to light. In essence, it calculates the illumination if the object would be surrounded by many lights such that their total intensity is some needed value (usually somewhat brighter than "white").<br /><br />Now, whether it's such simple AO, or AO that also accounts for some light inter-reflections, is only an implementation question. In my current implementation, I calculate only direct visibility, with no interreflections.<br /><br />The reason why non-AO shot is bright is that it doesn't have <I>any</I> shadows. Hence the "insides" if the character are bright (but logically, they shouldn't be). Why it doesn't have shadows, is another question of course :) Not really.

AO is basically calculating how much each point on some surface is “open” to light. In essence, it calculates the illumination if the object would be surrounded by many lights such that their total intensity is some needed value (usually somewhat brighter than “white”).

Now, whether it’s such simple AO, or AO that also accounts for some light inter-reflections, is only an implementation question. In my current implementation, I calculate only direct visibility, with no interreflections.

The reason why non-AO shot is bright is that it doesn’t have any shadows. Hence the “insides” if the character are bright (but logically, they shouldn’t be). Why it doesn’t have shadows, is another question of course :)

]]> By: imbusy http://aras-p.info/blog/2005/03/02/ambient-occlusion/comment-page-1/#comment-15 imbusy Fri, 04 Mar 2005 12:01:00 +0000 http://aras-p.info/blog/?p=17#comment-15 I have a question: as i've read, ambient occlusion is tracking rays of light that bounce of off other surfaces. So the amount of light in the scene should be higher when AO is on. So why in your AO shot, pieces of the character apear darker than in non-AO shot? I have a question: as i’ve read, ambient occlusion is tracking rays of light that bounce of off other surfaces. So the amount of light in the scene should be higher when AO is on. So why in your AO shot, pieces of the character apear darker than in non-AO shot?

]]> By: NeARAZ http://aras-p.info/blog/2005/03/02/ambient-occlusion/comment-page-1/#comment-16 NeARAZ Fri, 04 Mar 2005 09:36:00 +0000 http://aras-p.info/blog/?p=17#comment-16 Heh, the hard part is not showing work-in-progress shots, but actually finishing and polishing the demo :)<br /><br />Thanks for the comment, anyway. Heh, the hard part is not showing work-in-progress shots, but actually finishing and polishing the demo :)

Thanks for the comment, anyway.

]]> By: imbusy http://aras-p.info/blog/2005/03/02/ambient-occlusion/comment-page-1/#comment-17 imbusy Thu, 03 Mar 2005 21:53:00 +0000 http://aras-p.info/blog/?p=17#comment-17 This is going to be awesome :) This is going to be awesome :)

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