organicmaps/libtess2
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Merge pull request #9 from openscad/planar-crash-fix

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When the input is collinear, choose the most perpendicular normal
This commit is contained in:
Mikko Mononen 2015-01-14 00:11:39 +02:00
commit 041a3ae277
1 changed files with 10 additions and 1 deletions
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11
Source/tess.c
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@ -70,6 +70,15 @@ static int LongAxis( TESSreal v[3] )
return i; return i;
} }
static int ShortAxis( TESSreal v[3] )
{
int i = 0;
if( ABS(v[1]) < ABS(v[0]) ) { i = 1; }
if( ABS(v[2]) < ABS(v[i]) ) { i = 2; }
return i;
}
static void ComputeNormal( TESStesselator *tess, TESSreal norm[3] ) static void ComputeNormal( TESStesselator *tess, TESSreal norm[3] )
{ {
TESSvertex *v, *v1, *v2; TESSvertex *v, *v1, *v2;
@ -136,7 +145,7 @@ static void ComputeNormal( TESStesselator *tess, TESSreal norm[3] )
if( maxLen2 <= 0 ) { if( maxLen2 <= 0 ) {
/* All points lie on a single line -- any decent normal will do */ /* All points lie on a single line -- any decent normal will do */
norm[0] = norm[1] = norm[2] = 0; norm[0] = norm[1] = norm[2] = 0;
norm[LongAxis(d1)] = 1; norm[ShortAxis(d1)] = 1;
} }
} }