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 static void TransformChallenge()
{
//Create canvas of set size and width
//Create Transform that first offsets a point by 1/2 canvas size then
//rotates the object by 1/12th of 2*pi through 12 iterations
//At each location draw to the canvas a circle
int circleRadius = 5;
RT.Canvas canvas = new RT.Canvas(100, 100);
RT.Point currentLocation = new RT.Point();
//Offset 1/3 distance of canvas size;
currentLocation = RT.Mat4.TranslateMatrix(canvas.GetWidth() * 0.3f,
0.0f,
0.0f)
* currentLocation;
//Rotate loop
int maxIterations = 12;
for (int r = 0; r < maxIterations; r++)
{
currentLocation = RT.Mat4.RotateZMatrix(2.0f * RT.Constants.pi * (1.0f / maxIterations)) * currentLocation;
//Offset current location so that it is centered in the image by 1/2 width and height through translation
RT.Point screenSpaceLocation = RT.Mat4.TranslateMatrix(canvas.GetWidth() * 0.5f,
canvas.GetHeight() * 0.5f,
0.0f) * currentLocation;
Console.WriteLine("Point " + r.ToString());
Console.WriteLine(screenSpaceLocation);
//Draw circle at current location
canvas.DrawCircle((int)screenSpaceLocation.x,
(int)screenSpaceLocation.y,
circleRadius,
RT.Color.green);
}
//Save out the image when completed.
RT.Save.SaveCanvas(canvas, "TransformChallenge");
}
public Projectile(RT.Point position, RT.Vector velocity)
{
this.position = position;
this.velocity = velocity;
}