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fixed an OpenGL error caused by negative linewidth
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@ -558,7 +558,7 @@ void dqi_poly::gldraw() {
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#endif
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ld scale_at(const transmatrix& T) {
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if(DIM == 3 && pmodel == mdPerspective) return 1 / (tC0(T))[2];
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if(DIM == 3 && pmodel == mdPerspective) return 1 / abs((tC0(T))[2]);
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using namespace hyperpoint_vec;
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hyperpoint h1, h2, h3;
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applymodel(tC0(T), h1);
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