public virtual bool RayIntersection(Ray r, out float t, out Point3D normal)
{
t = 0;
normal = null;
Side best_side = null;
foreach (Side s in sides)
{
switch (s.points.Count)
{
case 3:
if (r.IntersectTriangle(s.get_point(0),
s.get_point(1),
s.get_point(2),
out float t1) &&
(t == 0 || t1 < t))
{
t = t1;
best_side = s;
}
break;
case 4:
if (r.IntersectTriangle(s.get_point(0),
s.get_point(1),
s.get_point(3),
out float t2) &&
(t == 0 || t2 < t))
{
t = t2;
best_side = s;
}
else if (r.IntersectTriangle(s.get_point(3),
s.get_point(1),
s.get_point(2),
out t2) &&
(t == 0 || t2 < t))
{
t = t2;
best_side = s;
}
break;
default:
break;
}
}
if (best_side != null)
{
normal = Side.norm(best_side);
mat.SetColor(best_side.drawing_pen.Color);
return(true);
}
return(false);
}
