protected override Intersection[] GetBaseIntersections(Ray ray)
{
var dir_cross_e2 = Tuple4.CrossProduct(ray.dir, E2);
var det = Tuple4.DotProduct(E1, dir_cross_e2);
if (Constants.EpsilonZero(Math.Abs(det)))
{
return(null);
}
var f = 1.0 / det;
var p1_to_origin = Tuple4.Subtract(ray.origin, P1);
var u = f * Tuple4.DotProduct(p1_to_origin, dir_cross_e2);
if ((u < 0.0) || (u > 1.0))
{
return(null);
}
var origin_cross_e1 = Tuple4.CrossProduct(p1_to_origin, E1);
var v = f * Tuple4.DotProduct(ray.dir, origin_cross_e1);
if ((v < 0.0) || ((u + v) > 1.0))
{
return(null);
}
var t = f * Tuple4.DotProduct(E2, origin_cross_e1);
return(new Intersection[] { new Intersection(t, this) });
}
public void Then_cross(string a, string b, double t1, double t2, double t3)
{
var c = Tuple4.CrossProduct(cache[a], cache[b]);
Assert.True(Constants.EpsilonCompare(t1, c.X));
Assert.True(Constants.EpsilonCompare(t2, c.Y));
Assert.True(Constants.EpsilonCompare(t3, c.Z));
}
public void TupleCrossProductTest()
{
var t1 = new Tuple4(1, 7, 3, TupleFlavour.Vector);
var t2 = new Tuple4(4, 5, 6, TupleFlavour.Vector);
var expected = new Tuple4(27, 6, -23, TupleFlavour.Vector);
Assert.Equal(expected, Tuple4.CrossProduct(t1, t2));
}
public TriangleFigure(IMatrix transformation, IMaterial material, Tuple4 p1, Tuple4 p2, Tuple4 p3)
{
this.Material = material;
this.Transformation = transformation;
this.P1 = p1;
this.P2 = p2;
this.P3 = p3;
this.E1 = Tuple4.Subtract(p2, p1);
this.E2 = Tuple4.Subtract(p3, p1);
this.Normal = Tuple4.Normalize(Tuple4.CrossProduct(E2, E1));
}