public void ShadeHitIsGivenIntersectionInShadow()
{
var w = new RTF.World
{
Lights = new List <RTF.Light>()
{
new RTF.Light(p.Point(0, 0, -10), RTF.Color.White)
}
};
var s1 = new Sphere();
w.Objects.Add(s1);
var s2 = new Sphere(t.Translation(0, 0, 10));
w.Objects.Add(s2);
var r = new RTF.Ray(p.Point(0, 0, 5), p.Vector(0, 0, 1));
var i = new RTF.Intersection(4, s2);
var comps = RTF.Computation.PrepareComputations(i, r);
var c = w.ShadeHit(comps);
var expected = new RTF.Color(0.1, 0.1, 0.1);
Assert.Equal(expected, c);
}
public void IntersectionEncapsulatesTAndObject()
{
var s = new Sphere();
var i = new RTF.Intersection(3.5, s);
Assert.Equal(3.5, i.T);
Assert.Equal(s, i.Object);
}
public void HitAllIntersectionNegativeT()
{
var s = new Sphere();
var i1 = new RTF.Intersection(-2, s);
var i2 = new RTF.Intersection(-1, s);
var xs = RTF.Intersection.Intersections(i2, i1);
var i = RTF.Intersection.Hit(xs);
Assert.Null(i);
}
public void HitSomeIntersectionNegativeT()
{
var s = new Sphere();
var i1 = new RTF.Intersection(-1, s);
var i2 = new RTF.Intersection(1, s);
var xs = RTF.Intersection.Intersections(i2, i1);
RTF.Intersection i = RTF.Intersection.Hit(xs);
Assert.Equal(i2, i);
}
public void HitAllIntersectionPositiveT()
{
var s = new Sphere();
var i1 = new RTF.Intersection(1, s);
var i2 = new RTF.Intersection(2, s);
var xs = RTF.Intersection.Intersections(i2, i1);
RTF.Intersection i = RTF.Intersection.Hit(xs);
Assert.Equal(i1, i);
}
public void HitWhenIntersectionOccursOutside()
{
var r = new RTF.Ray(
RTF.PointType.Point(0, 0, -5),
RTF.PointType.Vector(0, 0, 1));
var shape = new Sphere();
var i = new RTF.Intersection(4, shape);
var comps = RTF.Computation.PrepareComputations(i, r);
Assert.False(comps.Inside);
}
public void HitAlwaysLowestNonNegativeIntersec()
{
var s = new Sphere();
var i1 = new RTF.Intersection(5, s);
var i2 = new RTF.Intersection(7, s);
var i3 = new RTF.Intersection(-3, s);
var i4 = new RTF.Intersection(2, s);
var xs = RTF.Intersection.Intersections(i1, i2, i3, i4);
RTF.Intersection i = RTF.Intersection.Hit(xs);
Assert.Equal(i4, i);
}
public void AggregatingIntersections()
{
var s = new Sphere();
var i1 = new RTF.Intersection(1, s);
var i2 = new RTF.Intersection(2, s);
var xs = RTF.Intersection.Intersections(i1, i2);
Assert.Equal(2, xs.Length);
Assert.Equal(1, xs[0].T);
Assert.Equal(2, xs[1].T);
}
public void TheHitShouldOffsetThePoint()
{
var r = new RTF.Ray(p.Point(0, 0, -5), p.Vector(0, 0, 1));
var shape = new Sphere(t.Translation(0, 0, 1));
var i = new RTF.Intersection(5, shape);
var comps = RTF.Computation.PrepareComputations(i, r);
Assert.True(comps.OverPoint.Z < -EPSILON / 2);
Assert.True(comps.Point.Z > comps.OverPoint.Z);
}
public void HitWhenIntersectionOccursInside()
{
var r = new RTF.Ray(
RTF.PointType.Point(0, 0, 0),
RTF.PointType.Vector(0, 0, 1));
var shape = new Sphere();
var i = new RTF.Intersection(1, shape);
var comps = RTF.Computation.PrepareComputations(i, r);
Assert.Equal(RTF.PointType.Point(0, 0, 1), comps.Point);
Assert.Equal(RTF.PointType.Vector(0, 0, -1), comps.EyeV);
Assert.True(comps.Inside);
Assert.Equal(RTF.PointType.Vector(0, 0, -1), comps.NormalV);
}
public void PrecomputingStateIntersection()
{
var r = new RTF.Ray(
RTF.PointType.Point(0, 0, -5),
RTF.PointType.Vector(0, 0, 1));
var shape = new Sphere();
var i = new RTF.Intersection(4, shape);
var comps = RTF.Computation.PrepareComputations(i, r);
Assert.Equal(i.T, comps.T);
Assert.Equal(i.Object, comps.Object);
Assert.Equal(RTF.PointType.Point(0, 0, -1), comps.Point);
Assert.Equal(RTF.PointType.Vector(0, 0, -1), comps.EyeV);
Assert.Equal(RTF.PointType.Vector(0, 0, -1), comps.NormalV);
}
public void ShadingIntersection()
{
var w = RTF.World.Default();
var r = new RTF.Ray(
RTF.PointType.Point(0, 0, -5),
RTF.PointType.Vector(0, 0, 1));
var shape = w.Objects[0];
var i = new RTF.Intersection(4, shape);
var comps = RTF.Computation.PrepareComputations(i, r);
var c = w.ShadeHit(comps);
var exp = new RTF.Color(0.38066, 0.47583, 0.2855);
//var exp = new RTF.Color(0.50066, 0.57583, 0.42550);
CustomAssert.Equal(exp, c, 5);
}
public void ShadingIntersectionFromInside()
{
var w = RTF.World.Default();
w.Lights = new System.Collections.Generic.List <RTF.Light>()
{
new RTF.Light(
RTF.PointType.Point(0, 0.25, 0),
RTF.Color.White)
};
var r = new RTF.Ray(
RTF.PointType.Point(0, 0, 0),
RTF.PointType.Vector(0, 0, 1));
var shape = w.Objects[1];
var i = new RTF.Intersection(0.5, shape);
var comps = RTF.Computation.PrepareComputations(i, r);
var c = w.ShadeHit(comps);
var exp = new RTF.Color(0.90498, 0.90498, 0.90498);
CustomAssert.Equal(exp, c, 5);
}