copy doom legacy's replacement for the den == 0.0 calc in fracdivline
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@ -193,7 +193,7 @@ static polyvertex_t *fracdivline(fdivline_t *bsp, polyvertex_t *v1,
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v2dy = bsp->dy;
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v2dy = bsp->dy;
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den = v2dy*v1dx - v2dx*v1dy;
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den = v2dy*v1dx - v2dx*v1dy;
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if (den == 0.0)
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if (fabs(den) < 1.0E-36f) // avoid checking exactly for 0.0
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return NULL; // parallel
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return NULL; // parallel
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// first check the frac along the polygon segment,
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// first check the frac along the polygon segment,
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