Re: [rp-ml] File Formats and Planar Mesh

From: Ricardo Amaral (
Date: Thu Jul 12 2007 - 23:06:33 EEST

A litle bit on STL:

Thu, 12 Jul 2007 10:16:21 -0500
> Hi All.
> We'd be grateful for references to any sources that can shed light
> on the technical information in 3D file format descriptions (dxf,
> stl, vrml etc). In particular I'd be interested in knowing what, if
> any, parameters control how the four points of a mesh in space are
> oriented in the file format itself.
> Am I correct in assuming that the software has absolute control in
> terms of generating 3D mesh and that there are no translation
> issues when reading mesh files?
> How would one take a peek under the hood of say a mathematical
> modeling program's dxf generation as compared to say Rhino's or
> Materializes?
> Also, is stl composed of triangular meshes without exception (i.e.
> do two adjacent and coplanar facets ever collapse into one) and
> what are the current controls (say in V4) over the sizing of the
> triangular facets?
> Thanks,
> Jonathan

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