static void ResetClearance(double2 o, double2 d, Edge *t, float2 perp)
{
var rhs = t->LPrev;
var lhs = t->LNext->Sym;
var a = rhs->Dest->Point;
var b = rhs->Org->Point;
var c = lhs->Dest->Point;
var f = Math.ProjectSeg2(o, d, b, out var bi);
if (f >= 0 && f <= 1 &&
!lhs->Constrained && !rhs->Constrained &&
math.lengthsq(bi - b) < math.min(math.lengthsq(a - b), math.lengthsq(c - b)))
{
lhs->ClearanceLeft = -1;
rhs->ClearanceRight = -1;
}
if (f >= 0 && !rhs->Constrained)
{
var r = Math.IntersectLineSegClamped(o, o + perp, b, (a + b) / 2);
Math.ProjectSeg2(o, d, r, out var ri);
if (math.lengthsq(ri - r) < math.min(math.lengthsq(b - r), math.lengthsq(a - r)))
{
ResetClearance(o, d, rhs->Sym, perp);
}
}
if (f <= 1 && !lhs->Constrained)
{
var l = Math.IntersectLineSegClamped(d, d + perp, b, (c + b) / 2);
Math.ProjectSeg2(o, d, l, out var li);
if (math.lengthsq(li - l) < math.min(math.lengthsq(b - l), math.lengthsq(c - l)))
{
ResetClearance(o, d, lhs, perp);
}
}
}