public Ray RayForPixel(int px, int py)
{
float xOffset = (px + 0.5f) * PixelSize;
float yOffset = (py + 0.5f) * PixelSize;
float worldX = HalfWidth - xOffset;
float worldY = HalfHeight - yOffset;
Tuple pixel = Transform.Inverse() * Tuple.Point(worldX, worldY, -1);
Tuple origin = Transform.Inverse() * Tuple.Point(0, 0, 0);
return(new Ray(origin, (pixel - origin).Normalize()));
}
public DefaultWorld()
{
Lights.Add(new PointLight(Tuple.Point(-10, 10, -10), Tuple.Color(1, 1, 1)));
Shape s1 = new Sphere();
s1.Material.Color = Tuple.Color(0.8f, 1, 0.6f);
s1.Material.Diffuse = 0.7f;
s1.Material.Specular = 0.2f;
Shapes.Add(s1);
Shape s2 = new Sphere();
s2.Transform = Transformation.Scaling(0.5f, 0.5f, 0.5f);
Shapes.Add(s2);
}
private void ReadVertex(char[] contents)
{
var vertex = Tuple.Point(0, 0, 0);
for (int i = 0; i < 3; ++i)
{
Token token = GetNextToken(contents);
if (token.Type == TokenType.Number)
{
vertex[i] = float.Parse(token.Value);
}
else
{
throw new FormatException($"{token.Value} is not a Number");
}
}
Vertices.Add(vertex);
}
protected override List <Intersection> LocalIntersect(Ray localRay)
{
Tuple sphereToRay = localRay.Origin - Tuple.Point(0, 0, 0);
float a = localRay.Direction.Dot(localRay.Direction);
float b = localRay.Direction.Dot(sphereToRay);
float c = sphereToRay.Dot(sphereToRay) - 1;
float discriminant = b * b - a * c;
if (discriminant >= 0)
{
float sqrtDisc = System.MathF.Sqrt(discriminant);
return(Intersection.Aggregate(
new Intersection((-b - sqrtDisc) / a, this),
new Intersection((-b + sqrtDisc) / a, this)));
}
return(Intersection.Aggregate());
}
private static Tuple ReadPoint(JToken jToken)
{
return(Tuple.Point((float)jToken[0], (float)jToken[1], (float)jToken[2]));
}
protected override Tuple LocalNormalAt(Tuple localPoint, Intersection hit)
{
return(localPoint - Tuple.Point(0, 0, 0));
}
