public void intersectTranslatedSphere()
{
Ray ray = new Ray(new Point(0, 0, -5), new Vector3(0, 0, 1));
Sphere s = new Sphere();
s.Transform = Matrix4.TranslateMatrix(5, 0, 0);
Ray transformRay = ray.ApplyObjectTransform(s);
List <Intersection> xs = s.LocalIntersects(transformRay);
Assert.Empty(xs);
}
public static void Chapter05()
{
// Define projection plane
Point rayOrigin = new Point(0, 0, -5);
float wall_Z = 10.0f;
float wallSize = 7.0f;
// Create Canvas
int canvasPixels = 900;
Canvas canvas = new Canvas(canvasPixels, canvasPixels);
float pixelSize = wallSize / canvasPixels;
float canvasMidPoint = wallSize / 2;
Color color = Color.Red;
// Create Sphere in scene
Sphere sphere = new Sphere();
// Apply Transforms
//sphere.transformMatrix = Matrix4.TranslateMatrix(0,-0.75f,0) * Matrix4.ScaleMatrix(1, 0.5f, 1);
//sphere.transformMatrix = Matrix4.ScaleMatrix(0.5f, 1, 1) * Matrix4.RotateMatrix_Y(Math.PI / 6);
sphere.Transform = Matrix4.ShearMatrix(1, 0, 0, 0, 0, 0) * Matrix4.ScaleMatrix(.5f, 1, 1);
for (int y = 0; y < canvasPixels; y++)
{
float world_Y = canvasMidPoint - pixelSize * y;
for (int x = 0; x < canvasPixels; x++)
{
float world_X = -canvasMidPoint + pixelSize * x;
Point position = new Point(world_X, world_Y, wall_Z);
Ray r = new Ray(rayOrigin, (position - rayOrigin).Normalize());
r = r.ApplyObjectTransform(sphere);
List <Intersection> xs = sphere.GetIntersects(r);
//Console.WriteLine(Intersection.Hit(xs).t.ToString());
if (Intersection.Hit(xs) != null)
{
if (Math.Abs(xs[0].t - xs[1].t) < .5f)
{
canvas.SetPixelColor(x, y, Color.Blue);
}
else
{
canvas.SetPixelColor(x, y, color);
}
}
}
}
// Save Canvas to ppm
Console.WriteLine("\nSaving PPM file");
string filePath = "C:\\Dev\\C#\\PracticePrograms\\RayTracerChallenge\\__renders";
string fileName = "Chapter05Challenge_06";
string fileDirectoryComplete = filePath + "\\" + fileName + ".ppm";
Save.PPM(fileDirectoryComplete, canvas);
Console.WriteLine("Done: Program complete.");
Console.ReadKey();
}
