Subject:
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Re: CW/CCW, vertex sequence, co-planar, convex, (115kB)
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Newsgroups:
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lugnet.cad.dev
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Date:
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Thu, 30 Sep 1999 15:52:26 GMT
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Viewed:
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1702 times
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onyx wrote:
>
> the biggest problem with the LDraw parts/primatives library is that they
> weren't modeled in a robust modeling app... laying out all vertices by hand
> made it possible for every type of human error or preference to play a role in
> the library's creation... (i know my parts wouldn't pass a CW/CCW test) we've
> all created bowties, concave polys, concident verts, etc... even elements
> created by me in 3DSMAX and converted using MAX2DAT were not checked for
> "normal-friendliness"...
I was curious, how do you add a stud to a part if you're using MAX2DAT
? Can it be done in 3DS or you have to edit the part later ?
I thought that we've agreed that the new parts would have to pass L3P
tests for coincident verts and bow-ties, isn't this required ?
> true 3D programs don't deal with infitintely thin objects well... anyone who
> has ever built a doom level knows this ("hall of mirrors", for the
> experienced)..
> but many of our primatives are infiniteley thin (4-4cyli.dat) and were created
> to be used as 2-sided objects with zero thickness... this way they could act as
> either an outside *or* inside surface with normals facing in both directions...
> this won't work with the direction we're headed in..
If we had a good editor with things like csg, all of those problems
would be solved. Editing files by hand will produce errors, it's hard to
make sure that all surfaces are correct.
> making the programs deal with the innacuracies and correct them "on the fly" is
> wrong... totally re-rengineering the library is practically impossible.. but
> there is a real issue getting started here.. and it's only going to get worse..
You make it sound like this is the end of the world. :)
Leonardo
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Message has 1 Reply:
 | | Re: CW/CCW, vertex sequence, co-planar, convex, (115kB)
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| (...) MAX2DAT isn't really meant to be a comprehensive part authoring tool... it's easy to build simple objects (like a 2x2 tile or 1x1 round plate) directly in LEdit with primatives... but objects like complex technic pieces, wheels, etc often have (...) (27 years ago, 1-Oct-99, to lugnet.cad.dev)
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Message is in Reply To:
| | Re: CW/CCW, vertex sequence, co-planar, convex, (115kB)
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| There are commands in 3DS and 3DSMAX to "unify" normals (normals are what we're discussing... the vector that points perpendicular to a face, indicating which side is "out", which side is shaded or rendered)... i would assume there is documentation (...) (27 years ago, 29-Sep-99, to lugnet.cad.dev)
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