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fix some disappearing line issues

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This commit is contained in:
Trammell hudson 2018-03-03 14:27:54 -05:00
parent eae31edb38
commit a907622981
Failed to extract signature
1 changed files with 7 additions and 5 deletions
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12
tri.c
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@ -263,7 +263,7 @@ tri_bary_inside(
const float a = p.p[0];
const float b = p.p[1];
return 0 <= a && 0 <= b && a + b <= 1;
return 0 <= a && 0 <= b && a + b <= 1+EPS;
}
@ -573,7 +573,7 @@ tri_seg_intersect(
// if the intercept point on the segment is
// closer than the intercept point on the triangle edge,
// then there is no occlusion
if (is[0].p[2] < it[0].p[2])
if (is[0].p[2] <= it[0].p[2])
return tri_no_intersection;
// clipped from p0 to intersection
@ -581,14 +581,15 @@ tri_seg_intersect(
return tri_clipped;
}
// something isn't right. maybe we have a small triangle?
fprintf(stderr, "ONE INTERSECTION?");
// maybe we have a small triangle or a tangent.
// in which case the line is fine
return tri_no_intersection;
/*
fprintf(stderr, "ONE INTERSECTION?");
svg_line("#FFFF00", s->p[0].p, s->p[1].p, 20);
svg_line("#000080", t->p[0].p, t->p[1].p, 8);
svg_line("#000080", t->p[1].p, t->p[2].p, 8);
svg_line("#000080", t->p[2].p, t->p[0].p, 8);
*/
seg_print(s);
v3_print(tp0);
v3_print(tp1);
@ -596,6 +597,7 @@ tri_seg_intersect(
*new_seg = seg_new(is[0], s->p[1]);
s->p[1] = is[0];
return tri_split;
*/
}
// two intersections: find the one that is closer to p0