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 Spherical Scale Mapping
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Reply Quoting This MessageEdit Message lonesock    Member since: 2/12/2004
 Posted - 3/4/2005 5:37:51 PM
very cool!

could you keep optimum resolution using a box primitive instead of a sphere (and AABB instead of bounding sphere, of course)? Then you could get 1 vertex per pixel in the cubemap, and LOD type stuff would be very easy.

lonesock
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Reply Quoting This MessageEdit Message Drilian    Member since: 1/4/2000  From: Bellevue, WA, United States
 Posted - 3/4/2005 7:04:44 PM
It's worth noting that the skull that you use to demo is not, strictly speaking, a "convex" model. What with the eyes being concave and all.

However, there's no overlap from the point of view of the sphere texel that scans that portion of the model, which is why it works.

So it doesn't fail for ALL concave models, only those in which there's an overlap from the point of view of a sphere texel.
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Reply Quoting This MessageEdit Message aaron_ds    Member since: 1/10/2004  From: Fresno, CA, United States
 Posted - 3/5/2005 4:46:38 PM
Hasn't this been done before?
Displacement mapping?
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Reply Quoting This MessageEdit Message NoahAdler    Member since: 4/22/2000  From: Seattle, WA, United States
 Posted - 3/6/2005 1:13:13 AM
As Drillian pointed out, this technique does work for some concave meshes, but an important point is that it only works for genus 0 surfaces. It could be interesting to try to extend it to higher genera by using multiple cubemaps or something, but I can't really see a straightforward way of doing it offhand.
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Reply Quoting This MessageEdit Message superpig  GDNet Technical Lead  Member since: 5/26/2001  From: Oxford, United Kingdom
 Posted - 3/15/2005 6:12:37 PM
Quote:
Original post by aaron_ds
Hasn't this been done before?
Displacement mapping?
You'd use it with displacement mapping, sure, but this is talking about a particular application of it - namely converting a mesh into a map.
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