public void TestIntersectionInShade()
{
var world = new World();
world.Light = new PointLight(Tuple.Point(0, 0, -10), new Color(1, 1, 1));
world.Shapes.Add(new Sphere());
world.Shapes.Add(new Sphere
{
Transform = Matrix4.Translation(0, 0, 10)
});
var s2 = new Sphere
{
Transform = Matrix4.Translation(0, 0, 10)
};
world.Shapes.Add(s2);
var ray = new Ray(Tuple.Point(0, 0, 5), Tuple.Vector(0, 0, 1));
var i = new Intersection(4, s2);
var comp = Computation.Prepare(i, ray);
var color = LightUtil.ShadeHit(world, comp);
Assert.AreEqual(new Color(0.1, 0.1, 0.1), color);
}
public void TestShadeIntersection()
{
var world = WorldBuilder.DefaultWorld();
var ray = new Ray(Tuple.Point(0, 0, -5), Tuple.Vector(0, 0, 1));
var sphere = world.Shapes[0];
var i = new Intersection(4, sphere);
var comp = Computation.Prepare(i, ray);
var color = LightUtil.ShadeHit(world, comp);
Assert.AreEqual(new Color(0.38066, 0.47583, 0.2855), color);
}
public Color ColorAt(Ray ray, int remaining = 5)
{
var intersections = Intersect(ray);
var hit = intersections.Hit();
if (hit is null)
{
return(new Color(0, 0, 0));
}
var comps = Computation.Prepare(hit, ray, intersections);
return(LightUtil.ShadeHit(this, comps, remaining));
}
public void TestShadeIntersectionInside()
{
var world = WorldBuilder.DefaultWorld();
world.Light = new PointLight(Tuple.Point(0, 0.25, 0), new Color(1, 1, 1));
var ray = new Ray(Tuple.Point(0, 0, 0), Tuple.Vector(0, 0, 1));
var sphere = world.Shapes[1];
var i = new Intersection(0.5, sphere);
var comp = Computation.Prepare(i, ray);
var color = LightUtil.ShadeHit(world, comp);
Assert.AreEqual(new Color(0.90498, 0.90498, 0.90498), color);
}
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 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 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 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 static Vertex2D BuildVertex2D(Vertex vertex, Matrix4 transMat, Vector3 cameraPos, List <IPosLight> lights, int w, int h)
{
Vertex2D result = default(Vertex2D);
SoftDevice device = SoftDevice.Default;
if (null == device)
{
return(result);
}
// 将3d坐标投影到2d空间;
result = ProjectToScreen(vertex.position, transMat, (float)w, (float)h);
// 顶点光照;
LightUtil.ApplyVertexLightings(lights, cameraPos, vertex.worldPosition, vertex.worldNormal, ref result);
// 填充顶点信息;
result.FillRenderData(vertex.uv0, vertex.color, device.PerspectiveCorrection);
return(result);
}
public void TestShadeHitOnReflectiveShape()
{
var world = WorldBuilder.DefaultWorld();
var plane = new Plane
{
Transform = Matrix4.Translation(0, -1, 0)
};
plane.Material.Reflective = 0.5;
world.Shapes.Add(plane);
var ray = new Ray(Tuple.Point(0, 0, -3), Tuple.Vector(0, -0.5 * System.Math.Sqrt(2), 0.5 * System.Math.Sqrt(2)));
var i = new Intersection(System.Math.Sqrt(2), plane);
var comp = Computation.Prepare(i, ray);
var col = LightUtil.ShadeHit(world, comp);
Assert.AreEqual(new Color(0.876757, 0.924340, 0.829174), col);
}
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));
}
public void TestRefractShadeHit()
{
var world = WorldBuilder.DefaultWorld();
var floor = new Plane
{
Transform = Matrix4.Translation(0, -1, 0),
Material = new Material
{
Reflective = 0.5,
Transparency = 0.5,
RefractiveIndex = 1.5
}
};
var ball = new Sphere
{
Transform = Matrix4.Translation(0, -3.5, -0.5),
Material = new Material
{
Color = new Color(1, 0, 0),
Ambient = 0.5
}
};
world.Shapes.Add(floor);
world.Shapes.Add(ball);
var ray = new Ray(Tuple.Point(0, 0, -3), Tuple.Vector(0, -0.5 * System.Math.Sqrt(2), 0.5 * System.Math.Sqrt(2)));
var xs = new Intersections
{
new Intersection(System.Math.Sqrt(2), floor),
};
var comps = Computation.Prepare(xs[0], ray, xs);
var color = LightUtil.ShadeHit(world, comps, 5);
Assert.AreEqual(new Color(0.93391, 0.69643, 0.69243), color);
//Assert.AreEqual(new Color(0.93642, 0.68642, 0.68642), color);
}
private void Start()
{
instance = this;
FindLights();
}