STL triangulation not according to spec #40

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reinoudz opened this Issue Mar 26, 2012 · 0 comments

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Although not crucial now, the STL output is not according to the spec. First of all, all facet normals are zero. In that case programs tend to recalculate the facet normals. This is specified as

nv = (v2-v0) \cross (v1-v0)
with v0, v1, v2, nv R3 points

i.e. using the right-hand rule.

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