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if tangent is not defined and not checked this leads to segfault
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@ -1110,7 +1110,9 @@ namespace netgen
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{
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double s = s0 + j/(double) nsections * (s1-s0);
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prop.SetParameter (s);
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double curvature = prop.Curvature();
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double curvature = 0;
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if(prop.IsTangentDefined())
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curvature = prop.Curvature();
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if(curvature> maxcur) maxcur = curvature;
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if (curvature >= 1e99)
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