private static float?CheckSphereAt(Vector3 spherePosition, Vector3 origin, Vector3 direction)
{
var sphere = new Sphere(spherePosition, Color.red);
var r = new Ray(origin, direction);
return(sphere.Intersect(r));
}
public void RayMissesSphere()
{
var ray = new Ray(Tuple3D.Point(0, 2, -5), Tuple3D.Vector(0, 0, 1));
var sphere = new Sphere();
var xs = sphere.Intersect(ray);
Assert.That(xs.Count, Is.EqualTo(0), "intersection point count");
}
public void IntersectSetsObjectOnIntersection()
{
var r = new Ray(Tuple3D.Point(0, 0, -5), Tuple3D.Vector(0, 0, 1));
var s = new Sphere();
var xs = s.Intersect(r);
Assert.That(xs.Count, Is.EqualTo(2), "list count");
Assert.That(xs[0].TheObject, Is.EqualTo(s), "intersection 1");
Assert.That(xs[1].TheObject, Is.EqualTo(s), "intersection 2");
}
public void IntersectTranslatedSphereWithRay()
{
var ray = new Ray(Tuple3D.Point(0, 0, -5), Tuple3D.Vector(0, 0, 1));
var sphere = new Sphere();
sphere.Transform = Transformation.Translation(5, 0, 0);
var xs = sphere.Intersect(ray);
Assert.That(xs.Count, Is.EqualTo(0), "intersection point count");
}
public void SphereBehindRay()
{
var ray = new Ray(Tuple3D.Point(0, 0, 5), Tuple3D.Vector(0, 0, 1));
var sphere = new Sphere();
var xs = sphere.Intersect(ray);
Assert.That(xs.Count, Is.EqualTo(2), "intersection point count");
Assert.That(xs[0].Time, Is.EqualTo(-6), "xs[0]");
Assert.That(xs[1].Time, Is.EqualTo(-4), "xs[1]");
}
public void RayOriginatesInsideSphere()
{
var ray = new Ray(Tuple3D.Point(0, 0, 0), Tuple3D.Vector(0, 0, 1));
var sphere = new Sphere();
var xs = sphere.Intersect(ray);
Assert.That(xs.Count, Is.EqualTo(2), "intersection point count");
Assert.That(xs[0].Time, Is.EqualTo(-1), "xs[0]");
Assert.That(xs[1].Time, Is.EqualTo(1), "xs[1]");
}
public void RayIntersectsSphereAtTangent()
{
var ray = new Ray(Tuple3D.Point(0, 1, -5), Tuple3D.Vector(0, 0, 1));
var sphere = new Sphere();
var xs = sphere.Intersect(ray);
Assert.That(xs.Count, Is.EqualTo(2), "intersection point count");
Assert.That(xs[0].Time, Is.EqualTo(5), "xs[0]");
Assert.That(xs[1].Time, Is.EqualTo(5), "xs[1]");
}
public void IntersectScaledSphereWithRay()
{
var ray = new Ray(Tuple3D.Point(0, 0, -5), Tuple3D.Vector(0, 0, 1));
var sphere = new Sphere
{
Transform = Transformation.Scaling(2, 2, 2)
};
var xs = sphere.Intersect(ray);
Assert.That(xs.Count, Is.EqualTo(2), "intersection point count");
Assert.That(xs[0].Time, Is.EqualTo(3), "xs[0]");
Assert.That(xs[1].Time, Is.EqualTo(7), "xs[1]");
}
