public void IntersectingRayWithEmptyGroup()
{
var g = new shape.Group();
var r = new Ray(pt.Point(0, 0, 0), pt.Vector(0, 0, 0));
var xs = g.Intersect(r);
Assert.Empty(xs);
}
public void IntersectingRayGrouTestChildrenIfBoxHit()
{
var child = new shape.TestShape();
var shape = new shape.Group();
shape.Add(child);
var r = new Ray(pt.Point(0, 0, -5), pt.Vector(0, 0, 1));
_ = shape.Intersect(r);
Assert.NotNull(child.SavedRay);
}
public void IntersectingATransformedGroup()
{
var g = new shape.Group(transform.Scaling(2, 2, 2));
var s = new shape.Sphere(transform.Translation(5, 0, 0));
g.Add(s);
var r = new Ray(pt.Point(10, 0, -10), pt.Vector(0, 0, 1));
var xs = g.Intersect(r);
Assert.Equal(2, xs.Count());
}
public void IntersectingRayWithNonemptyGroup()
{
var g = new shape.Group();
var s1 = new shape.Sphere();
var s2 = new shape.Sphere(transform.Translation(0, 0, -3));
var s3 = new shape.Sphere(transform.Translation(5, 0, 0));
g.Add(s1);
g.Add(s2);
g.Add(s3);
var r = new Ray(pt.Point(0, 0, -5), pt.Vector(0, 0, 1));
var xs = g.Intersect(r);
Assert.Equal(4, xs.Count());
Assert.Equal(s2, xs[0].Object);
Assert.Equal(s2, xs[1].Object);
Assert.Equal(s1, xs[2].Object);
Assert.Equal(s1, xs[3].Object);
}
