static void Main(string[] args)
{
const int width = 100;
const int height = 100;
var canvas = new Canvas(width, height);
var sphere = new Sphere();
sphere.Material.Color = new Color(1, 0.2, 1);
var light = new PointLight(Tuple.Point(-10, 10, -10), new Color(1, 1, 1));
var origin = Tuple.Point(0, 0, -5);
var red = new Color(255, 0, 0);
var scale = 0.01;
for (int x = 0; x < width; x++)
{
System.Console.Write(".");
for (int y = 0; y < height; y++)
{
var ray = new Ray(origin,
Tuple.Vector(scale * (x - 0.5 * width),
scale * (y - 0.5 * height), 1));
ray.Direction.Normalize();
var intersections = sphere.Intersect(ray);
if (intersections.Count > 0)
{
var hit = intersections.Hit();
var hitObject = hit.Shape;
var point = ray.Position(hit.Distance);
var normal = hitObject.Normal(point);
var eye = -ray.Direction;
var color = LightUtil.Lighting(hitObject.Material, hitObject, light, point, eye, normal, false);
canvas.SetPixel(x, y, color);
}
}
}
PPMWriter.WriteToFile(canvas, "RayCast2.ppm");
}
public void TestLightingStraightReflect()
{
var material = new Material();
var s = new Sphere
{
Material = material
};
var position = Tuple.Point(0, 0, 0);
var eye = Tuple.Vector(0, 0, -1);
var normal = Tuple.Vector(0, 0, -1);
var light = new PointLight(Tuple.Point(0, 0, -10), new Color(1, 1, 1));
var res = LightUtil.Lighting(material, s, light, position, eye, normal, false);
Assert.AreEqual(new Color(1.9, 1.9, 1.9), res);
}
public void TestLightingAngleReflectHighlight()
{
var material = new Material();
var s = new Sphere
{
Material = material
};
var position = Tuple.Point(0, 0, 0);
var eye = Tuple.Vector(0, -0.5 * System.Math.Sqrt(2), -0.5 * System.Math.Sqrt(2));
var normal = Tuple.Vector(0, 0, -1);
var light = new PointLight(Tuple.Point(0, 10, -10), new Color(1, 1, 1));
var res = LightUtil.Lighting(material, s, light, position, eye, normal, false);
Assert.AreEqual(new Color(1.6364, 1.6364, 1.6364), res);
}
public void TestLightingInShadow()
{
var material = new Material();
var s = new Sphere
{
Material = material
};
var position = Tuple.Point(0, 0, 0);
var eye = Tuple.Vector(0, 0, -1);
var normal = Tuple.Vector(0, 0, -1);
var light = new PointLight(Tuple.Point(0, 0, -10), new Color(1, 1, 1));
var res = LightUtil.Lighting(material, s, light, position, eye, normal, true);
Assert.AreEqual(new Color(0.1, 0.1, 0.1), res);
}
public void TestLighting()
{
var m = new Material
{
Ambient = 1,
Diffuse = 0,
Specular = 0,
Pattern = new StripedPattern(_white, _black)
};
var s = new Sphere
{
Material = m
};
var eye = Tuple.Vector(0, 0, -1);
var normal = Tuple.Vector(0, 0, -1);
var light = new PointLight(Tuple.Point(0, 0, -10), new Color(1, 1, 1));
Assert.AreEqual(_white, LightUtil.Lighting(m, s, light, Tuple.Point(0.9, 0, 0), eye, normal, false));
Assert.AreEqual(_black, LightUtil.Lighting(m, s, light, Tuple.Point(1.1, 0, 0), eye, normal, false));
}