public Intersections _IntersectLocal(Ray ray)
{
var dirCrossE2 = ray.Direction * E2;
var det = E1.DotProduct(dirCrossE2);
if (Math.Abs(det) < Helper.Epsilon)
{
return(new Intersections());
}
var f = 1.0 / det;
var p1ToOrigin = ray.Origin - P1;
var u = f * p1ToOrigin.DotProduct(dirCrossE2);
if (u < 0 || u > 1)
{
return(new Intersections());
}
var originCrossE1 = p1ToOrigin * E1;
var v = f * ray.Direction.DotProduct(originCrossE1);
if (v < 0 || (u + v) > 1)
{
return(new Intersections());
}
var t = f * E2.DotProduct(originCrossE1);
return(new Intersections {
new Intersection(t, this, u, v)
});
}