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 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);
}
public void AddingChildToGroup()
{
var g = new shape.Group();
var s = new shape.TestShape();
g.Add(s);
Assert.NotEmpty(g.Children);
Assert.Contains(s, g.Children);
Assert.Equal(g, s.Parent);
}
private shapes.Group Hexagon()
{
var hex = new shapes.Group();
for (int i = 0; i <= 5; i++)
{
var side = HexagonSide();
side.Transform = transform.RotationY(i * Math.PI / 3);
hex.Add(side);
}
return(hex);
}
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 GroupHasBoundingBoxContainsItsChildren()
{
var s = new shape.Sphere()
{
Transform = transform.Translation(2, 5, -3) * transform.Scaling(2, 2, 2)
};
var c = new shape.Cylinder()
{
Minimum = -2,
Maximum = 2,
Transform = transform.Translation(-4, -1, 4) * transform.Scaling(0.5, 1, 0.5)
};
var shape = new shape.Group();
shape.Add(s);
shape.Add(c);
var box = shape.Bounds();
Assert.Equal(pt.Point(-4.5, -3, -5), box.Minimum);
Assert.Equal(pt.Point(4, 7, 4.5), box.Maximum);
}
public void FindingNormalOnChildObject()
{
var g1 = new shape.Group(transform.RotationY(Math.PI / 2));
var g2 = new shape.Group(transform.Scaling(1, 2, 3));
g1.Add(g2);
var s = new shape.Sphere(transform.Translation(5, 0, 0));
g2.Add(s);
var n = s.NormalAt(pt.Point(1.7311, 1.1547, -5.5774));
//TODO precision error
CustomAssert.Equal(pt.Vector(0.2856, 0.4286, -0.8572), n, 4);
}
public void ConvertingNormalFromObjectToWorldSpace()
{
var g1 = new shape.Group(transform.RotationY(Math.PI / 2));
var g2 = new shape.Group(transform.Scaling(1, 2, 3));
g1.Add(g2);
var s = new shape.Sphere(transform.Translation(5, 0, 0));
g2.Add(s);
var value = Math.Sqrt(3) / 3;
var n = s.NormalToWorld(pt.Vector(value, value, value));
CustomAssert.Equal(pt.Vector(0.2857, 0.4286, -0.8571), n, 4);
}
public void ConvertingPointFromWorldToObjectSpace()
{
var g1 = new shape.Group(transform.RotationY(Math.PI / 2));
var g2 = new shape.Group(transform.Scaling(2, 2, 2));
g1.Add(g2);
var s = new shape.Sphere(transform.Translation(5, 0, 0));
g2.Add(s);
var p = s.WorldToObject(pt.Point(-2, 0, -10));
CustomAssert.Equal(pt.Point(0, 0, -1), p, 5);
}
public void PartitioningGroupChildren()
{
var s1 = new shape.Sphere(transform.Translation(-2, 0, 0));
var s2 = new shape.Sphere(transform.Translation(2, 0, 0));
var s3 = new shape.Sphere();
var g = new shape.Group();
g.Add(new List <shape.Shape>()
{
s1, s2, s3
});
(List <shape.Shape> left, List <shape.Shape> right) = g.Partition();
Assert.Equal(1, g.Count());
Assert.Single(left);
Assert.Equal(s1, left[0]);
Assert.Single(right);
Assert.Equal(s2, right[0]);
}
