public RayTracer()
{
this.image = new Bitmap(xResolution, yResolution);
this.scene = createScene();
this.scene.setResolution(xResolution, yResolution);
this.scene.preprocess();
this.core = new RT.Core(scene);
}
public static void Chapter5Challenge()
{
//Create an image of a sphere by only testing for hits or misses.
RT.Mat4 transMatrix = new RT.Mat4();
RT.Scene scene = new RT.Scene();
//transMatrix = RT.Mat4.ScaleMatrix(1,0.5f,1);
//transMatrix = RT.Mat4.ScaleMatrix(0.5f,1,1);
//transMatrix = RT.Mat4.RotateMatrix(0.0f, 0.0f, RT.Constants.pi * 0.25f) * RT.Mat4.ScaleMatrix(1,0.5f,1);
transMatrix = RT.Mat4.ShearMatrix(1, 0, 0, 0, 0, 0) * RT.Mat4.ScaleMatrix(0.5f, 1, 1);
int resolution = 200;
RT.Canvas canvas = new RT.Canvas(resolution, resolution);
canvas.FillCanvas(RT.Color.black);
RT.Sphere sphere = new RT.Sphere();
sphere.SetMatrix(transMatrix);
RT.Point camera = new RT.Point(0, 0, -5);
//Use the wall x and y as the width and height and the position of the wall as the z value
RT.Point wall = new RT.Point(0.0f, 0.0f, 7f);
double wallSize = 7.0f;
//Camera is the start point, rays are created by taking iterating over the wall in resultion steps
//vertically and horizontally, calc wall - camera to get direction of camera to wall location.
//Check if the ray hits the sphere, if it does draw red if it does not draw black.
for (int y = 0; y < resolution; y++)
{
for (int x = 0; x < resolution; x++)
{
//Need to start at half the width over from the walls origin and increment from there
double increment = wallSize / resolution;
RT.Vector currentWallPixel = wall - new RT.Point((wallSize * 0.5f) - x * increment,
(wallSize * 0.5f) - y * increment,
wall.z);
//This presents a problem when I want to convert a point to a vector...
RT.Point point = (currentWallPixel - camera);
RT.Vector direction = new RT.Vector(point).Normalize();
RT.Ray ray = new RT.Ray(camera, direction);
RT.Intersection hit = RT.Scene.current.Hit(scene.Intersections(ray));
if (hit != null)
{
canvas.SetPixel(x, y, RT.Color.red);
}
}
}
RT.Save.SaveCanvas(canvas, "Chapter5Challenge");
}
public RT.Scene createScene()
{
float kd = 0.6f;
float ka = 0.4f;
int maxr = 15;
RT.Scene scene = new RT.Scene();
RT.Group world = new RT.Group();
System.Random rand = new System.Random();
for (int i = 0; i < 60; i++)
{
float x = (float)((i * 300) % (maxr * 1000)) / 1000;
float y = (float)((i * 600) % (maxr * 1000)) / 1000;
float z = (float)((i * 900) % (maxr * 1000)) / 3000;
world.addObject(new RT.Sphere(
new RT.LambertianMaterial(new RT.Color(0.4f, 0.9f, 0.3f), kd, ka),
new RT.Point(-(float)maxr * 0.5f + x, -(float)maxr * 0.5f + y, z), 0.3f));
}
world.addObject(new RT.Plane(new RT.LambertianMaterial(
new RT.Color(0.8f, 0.8f, 0.8f), kd, ka), new RT.Vector(0, 0, 1),
new RT.Point(0, 0, -0.1f)));
scene.setObject(world);
scene.setBackground(new RT.ConstantBackground(
new RT.Color(0.0f, 0.0f, 0.0f)));
scene.setAmbient(new RT.Color(ka, ka, ka));
scene.addLight(new RT.PointLight(new RT.Point(20, -30, 100),
new RT.Color(0.9f, 0.9f, 0.9f)));
scene.setCamera(new RT.PinholeCamera(new RT.Point(12, -12, 7),
new RT.Point(1, 1, 2), new RT.Vector(0, 0, 1), 60));
return scene;
}
