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On Tue, 31 Aug 1999 21:17:41 -0500, Mark Gordon <mtg### [at] mailbag com>
wrote:
>Ron Parker wrote:
>>
>> Unfortunately, it's not quite that easy. You can't lop of just any
>> pointy bit. Take a simple isosceles triangle. Add a new vertex at
>> the center of the base. Move that vertex upward, so what you get looks
>> like a rather angular version of the Federation emblem from Star Trek.
>> Note that the angle surrounding the topmost vertex qualifies as a
>> "pointy bit" yet the resulting triangle is neither inside nor outside
>> the polygon.
>
>Point well taken. Like I said, I was a bit sleep deprived.
>
It would appear from empiracle evidence that .OBJ writers are using
the many-verteces face as a space saving technique (obviously 20-odd
coplanar triangles take less file space when expressed as a single
face than as numerous triangles). I have yet to find a face which
isn't convex, or one that isn't co-planar. As such I've got a simple
solution in place just waiting for a .OBJ file with the right
deficiencies to make the program translate incorrectly <eg>
Please - no one build a .OBJ in a text editor just to break the
program!
Cheers,
Cliff Bowman
Why not pay my 3D Dr Who site a visit at http://www.who3d.cwc.net/
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