private static void TestCase09()
{
Material m = new Material();
Tuple position = Tuple.Point(0, 0, 0);
Tuple eyev = Tuple.Vector(0, 0, -1);
Tuple normalv = Tuple.Vector(0, 0, -1);
Light light = new PointLight(Tuple.Point(0, 0, -10), Tuple.Color(1, 1, 1));
LightingModel phong = new PhongReflection();
Tuple result = phong.Lighting(m, new Sphere(), light, position, eyev, normalv, false);
Assert.Equal(Tuple.Color(1.9f, 1.9f, 1.9f), result);
eyev = Tuple.Vector(0, Sqrt(2) / 2, -Sqrt(2) / 2);
result = phong.Lighting(m, new Sphere(), light, position, eyev, normalv, false);
Assert.Equal(Tuple.Color(1.0f, 1.0f, 1.0f), result);
eyev = Tuple.Vector(0, 0, -1);
light = new PointLight(Tuple.Point(0, 10, -10), Tuple.Color(1, 1, 1));
result = phong.Lighting(m, new Sphere(), light, position, eyev, normalv, false);
Assert.Equal(Tuple.Color(0.7364f, 0.7364f, 0.7364f), result);
eyev = Tuple.Vector(0, -Sqrt(2) / 2, -Sqrt(2) / 2);
result = phong.Lighting(m, new Sphere(), light, position, eyev, normalv, false);
Assert.Equal(Tuple.Color(1.6364f, 1.6364f, 1.6364f), result);
}
private static void TestCase03()
{
// Lighting with a pattern applied
Material m = new Material();
m.Pattern = new StripePattern(white, black);
m.Ambient = 1;
m.Diffuse = 0;
m.Specular = 0;
Tuple eyev = Tuple.Vector(0, 0, -1);
Tuple normalv = Tuple.Vector(0, 0, -1);
Light light = new PointLight(Tuple.Point(0, 0, -10), Tuple.Color(1, 1, 1));
LightingModel l = new PhongReflection();
Tuple c1 = l.Lighting(m, new Sphere(), light, Tuple.Point(0.9f, 0, 0), eyev, normalv, false);
Tuple c2 = l.Lighting(m, new Sphere(), light, Tuple.Point(1.1f, 0, 0), eyev, normalv, false);
Assert.Equal(white, c1);
Assert.Equal(black, c2);
}
private static void TestCase10()
{
Material m = new Material();
Tuple position = Tuple.Point(0, 0, 0);
Tuple eyev = Tuple.Vector(0, 0, -1);
Tuple normalv = Tuple.Vector(0, 0, -1);
Light light = new PointLight(Tuple.Point(0, 0, 10), Tuple.Color(1, 1, 1));
LightingModel phong = new PhongReflection();
Tuple result = phong.Lighting(m, new Sphere(), light, position, eyev, normalv, false);
Assert.Equal(Tuple.Color(0.1f, 0.1f, 0.1f), result);
}
private static void Simulate()
{
int canvasPixel = 256;
Canvas c = new Canvas(canvasPixel, canvasPixel);
Sphere s = new Sphere();
s.Material.Color = Tuple.Color(1, 0.2f, 1);
float wallSize = 7.0f;
float half = wallSize * 0.5f;
float pixelSize = wallSize / canvasPixel;
Tuple lightPosition = Tuple.Point(-10, 10, -10);
Tuple lightColor = Tuple.Color(1, 1, 1);
Light light = new PointLight(lightPosition, lightColor);
Tuple rayOrigin = Tuple.Point(0, 0, -5);
LightingModel phong = new PhongReflection();
for (int h = 0; h < c.Height; ++h)
{
float worldY = pixelSize * h - half;
for (int w = 0; w < c.Width; ++w)
{
float worldX = pixelSize * w - half;
Tuple position = Tuple.Point(worldX, worldY, 10);
Ray r = new Ray(rayOrigin, (position - rayOrigin).Normalize());
List <Intersection> xs = s.Intersect(r);
Intersection hit = Intersection.Hit(xs);
if (hit != null)
{
Tuple point = r.Position(hit.T);
Tuple normal = hit.Object.NormalAt(point, hit);
Tuple eye = -r.Direction;
Tuple color = phong.Lighting(hit.Object.Material, hit.Object, light, point, eye, normal, false);
c.WritePixel(w, c.Height - h, color);
}
}
}
using (StreamWriter sw = new StreamWriter(@"./purpleSphere.ppm"))
{
sw.Write(c.ToPPM());
}
Assert.True(true);
}
private static void TestCase05()
{
World w = new DefaultWorld();
w.Lights[0] = new PointLight(Tuple.Point(0, 0.25f, 0), Tuple.Color(1, 1, 1));
Ray r = new Ray(Tuple.Point(0, 0, 0), Tuple.Vector(0, 0, 1));
Shape shape = w.Shapes[1];
Intersection i = new Intersection(0.5f, shape);
Computation comps = new Computation(i, r);
LightingModel phong = new PhongReflection();
Tuple c = phong.Lighting(comps.Object.Material,
comps.Object,
w.Lights[0],
comps.Point,
comps.Eyev,
comps.Normalv,
false);
Assert.Equal(Tuple.Color(0.90498f, 0.90498f, 0.90498f), c);
}
