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Damien Guichard wrote:
> It has been said that, with ldraw parts, we have the geometry of TLG bricks.
> This is rather optimistic. Because geometry would be CSG descriptions that
> allow much more (although slower) than quads and triangles. CSG descriptions
> allow part collision detection.
What's "CSG descriptions"?
> Thinking about BFC statements I realised they also allow collision detection.
> The prerequisite is having convex parts.
But they aren't (as you also write).
Still, you are probably correct that BFC information in the
LDraw parts can be used for collision detection.
> Anyway, the remaining problem is that most (if not all, including Brick 2 x
> 4) ldraw parts are not convex but concave. Is there any simply mean to
> extend BFC with metacommands that split ldraw parts in convex subpart? Does
> the topic deserve the effort? Any interest at all? Just an idea to see what
> reply.
I think it deserves further consideration.
Jacob
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Message is in Reply To:
 | | Parts as volumes (instead of surfaces)
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| It has been said that, with ldraw parts, we have the geometry of TLG bricks. This is rather optimistic. Because geometry would be CSG descriptions that allow much more (although slower) than quads and triangles. CSG descriptions allow part collision (...) (22 years ago, 6-Apr-02, to lugnet.cad.dev.org.ldraw)
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