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 bool AABBIntersections(RT.Ray ray)
{
foreach (RT.RayObject r in root.GetChildren())
{
if (r.GetBounds().Intersect(ray))
{
return(true);
}
}
return(false);
}
public List <RT.Intersection> Intersections(RT.Ray ray)
{
List <RT.Intersection> intersections = new List <RT.Intersection>();
//Why am I doing intersections over all the children?
//Shouldn't I just perform intersections on the group and have them be returned?
intersections = root.Intersect(ray);
/*
* foreach (RT.RayObject r in root.GetChildren())
* {
* List<Intersection> tempList = r.Intersect(ray);
* intersections.AddRange(tempList);
* }
*/
return(Intersection.SortIntersections(intersections));
}
