public static Vector3 trace(Ray ray, int depth, Random rnd)
{
var color = new Vector3();
bool did_hit = false;
var hit = new Hit();
var sp = new Sphere();
hit.dist = 1e15f;
foreach (var s in spheres)
{
var lh = s.Hit(ray);
if (lh != null && lh.Value.dist > 0.0001f && lh.Value.dist < hit.dist)
{
sp = s;
did_hit = true;
color = s.color;
hit = lh.Value;
}
}
if (did_hit && depth < MAX_DEPTH)
{
if (sp.is_light != true)
{
var nray = new Ray(
hit.point,
RayBench.rnd_dome(hit.normal, rnd)
);
var ncolor = RayBench.trace(nray, depth + 1, rnd);
var at = nray.direction.Dot(hit.normal);
color = color.Mul(ncolor.Mul(at));
}
}
if (did_hit == false || depth >= MAX_DEPTH)
{
return(new Vector3());
}
return(color);
}
public static void Main(String[] args)
{
spheres[0] = (new Sphere(
new Vector3(0, -10002, 0),
9999,
new Vector3(1, 1, 1),
false));
spheres[1] = (new Sphere(
new Vector3(-10012, 0, 0),
9999,
new Vector3(1, 0, 0),
false));
spheres[2] = (new Sphere(
new Vector3(10012, 0, 0),
9999,
new Vector3(0, 1, 0),
false));
spheres[3] = (new Sphere(
new Vector3(0, 0, -10012),
9999,
new Vector3(1, 1, 1),
false));
spheres[4] = (new Sphere(
new Vector3(0, 10012, 0),
9999,
new Vector3(1, 1, 1),
true));
spheres[5] = (new Sphere(
new Vector3(-5, 0, 2),
2,
new Vector3(1, 1, 0),
false));
spheres[6] = (new Sphere(
new Vector3(0, 5, -1),
4,
new Vector3(1, 0, 0),
false));
spheres[7] = (new Sphere(
new Vector3(8, 5, -1),
2,
new Vector3(0, 0, 1),
false));
var data = new Vector3[RayBench.HEIGHT][];
var cam = new Camera {
eye = new Vector3(0.0f, 4.5f, 75.0f),
lt = new Vector3(-8, 9, 50),
rt = new Vector3(8, 9, 50),
lb = new Vector3(-8, 0, 50),
};
var vdu = cam.rt.Sub(cam.lt).Div(RayBench.WIDTH);
var vdv = cam.lb.Sub(cam.lt).Div(RayBench.HEIGHT);
var options = new ParallelOptions();
options.MaxDegreeOfParallelism = Environment.ProcessorCount;
Parallel.For(0, RayBench.HEIGHT, options, y => {
var random = rnd.Value;
data[y] = new Vector3[RayBench.WIDTH];
for (int x = 0; x < RayBench.WIDTH; ++x)
{
var color = new Vector3();
var ray = new Ray();
ray.origin = cam.eye;
for (int i = 0; i < RayBench.SAMPLES; ++i)
{
ray.direction = cam.lt.Add(
vdu.Mul(x + random.NextFloat()).Add(
vdv.Mul(y + random.NextFloat())));
ray.direction = ray.direction.Sub(ray.origin);
ray.direction = ray.direction.Unit();
color = color.Add(RayBench.trace(ray, 0, random));
}
color = color.Div(RayBench.SAMPLES);
data[y][x] = color;
}
});
RayBench.WritePPM(data);
}
public static void Main(String[] args)
{
spheres[0] = (new Sphere(
new Vector3(0, -10002, 0),
9999,
new Vector3(1, 1, 1),
false));
spheres[1] = (new Sphere(
new Vector3(-10012, 0, 0),
9999,
new Vector3(1, 0, 0),
false));
spheres[2] = (new Sphere(
new Vector3(10012, 0, 0),
9999,
new Vector3(0, 1, 0),
false));
spheres[3] = (new Sphere(
new Vector3(0, 0, -10012),
9999,
new Vector3(1, 1, 1),
false));
spheres[4] = (new Sphere(
new Vector3(0, 10012, 0),
9999,
new Vector3(1, 1, 1),
true));
spheres[5] = (new Sphere(
new Vector3(-5, 0, 2),
2,
new Vector3(1, 1, 0),
false));
spheres[6] = (new Sphere(
new Vector3(0, 5, -1),
4,
new Vector3(1, 0, 0),
false));
spheres[7] = (new Sphere(
new Vector3(8, 5, -1),
2,
new Vector3(0, 0, 1),
false));
var data = new Vector3[RayBench.HEIGHT][];
var cam = new Camera();
var vdu = cam.rt.Sub(cam.lt).Div(RayBench.WIDTH);
var vdv = cam.lb.Sub(cam.lt).Div(RayBench.HEIGHT);
var options = new ParallelOptions();
options.MaxDegreeOfParallelism = 4;
//for(int y = 0; y < RayBench.HEIGHT; ++y) {
Parallel.For(0, RayBench.HEIGHT, options, y => {
data[y] = new Vector3[RayBench.WIDTH];
for (int x = 0; x < RayBench.WIDTH; ++x)
{
var color = new Vector3();
var ray = new Ray();
ray.origin = cam.eye;
for (int i = 0; i < RayBench.SAMPLES; ++i)
{
ray.direction = cam.lt.Add(
vdu.Mul((float)(x + rnd.NextDouble())).Add(
vdv.Mul((float)(y + rnd.NextDouble()))));
ray.direction = ray.direction.Sub(ray.origin);
ray.direction = ray.direction.Unit();
color = color.Add(RayBench.trace(ray, 0));
}
color = color.Div(RayBench.SAMPLES);
data[y][x] = color;
}
});
RayBench.WritePPM(data);
}
