public void Render(List <Sphere> objects, List <Light> lights)
{
float fov = (float)Math.PI / 3f;
Bitmap bmp = new Bitmap(pictureBox1.Width, pictureBox1.Height);
LockBitmap lockBitmap = new LockBitmap(bmp);
lockBitmap.LockBits();
int width = lockBitmap.Width;
int height = lockBitmap.Height;
var result = Parallel.For(0, height, (j, state) =>
{
var result1 = Parallel.For(0, width, (i, state1) =>
{
{
var dirx = i + .5f - width / 2f;
var diry = -(j + .5f) + height / 2f;
var dirz = -height / (2f * (float)Math.Tan(fov / 2f));
var vcam = new Vec3f(0, 0, 0);
var vdir = new Vec3f(dirx, diry, dirz).normalize();
Vec3f res = cast_ray(vcam, vdir, objects, lights);
float max = Math.Max(res.x, Math.Max(res.y, res.z));
if (max > 1)
{
res *= (1 / max);
}
Color col = Color.FromArgb((int)(255 * res.x), (int)(255 * res.y), (int)(255 * res.z));
lockBitmap.SetPixel(i, j, col);
}
});
});
lockBitmap.UnlockBits();
pictureBox1.Image = bmp;
}
public Light(Vec3f position, float intensity)
{
this.position = position;
this.intensity = intensity;
}
public Sphere(Vec3f center, float radius, Material material)
{
Center = center;
Radius = radius;
Material = material;
}
private static bool SceneIntersect(Vec3f orig, Vec3f dir, List <Sphere> spheres, ref Vec3f hit, ref Vec3f N, ref Material material)
{
var spheresDist = float.MaxValue;
foreach (var sphere in spheres)
{
var disti = 0f;
if (sphere.RayIntersect(orig, dir, ref disti) && disti < spheresDist)
{
spheresDist = disti;
hit = orig + dir * disti;
N = (hit - sphere.Center).normalize();
material = sphere.Material;
}
}
List <float> dists = new List <float>();
dists.Add(spheresDist);
var floor = float.MaxValue;
if (Math.Abs(dir.y) > 1e-3)
{
// The checkerboard plane has equation y = -4.
var d = -(orig.y + 8) / dir.y;
var pt = orig + dir * d;
if (d > 0 && Math.Abs(pt.x) < 10 && pt.z <= 0 && pt.z >= -30 && d < spheresDist)
{
floor = d;
hit = pt;
N = new Vec3f(0, 1, 0);
var c1 = new Vec3f(.3f, .3f, .3f);
var c2 = new Vec3f(.3f, .2f, .1f);
material = new Material(1, new[] { .9f, .1f, .0f, .0f }, new Vec3f(.3f, .3f, .3f), 10);
}
}
dists.Add(floor);
var ceiling = float.MaxValue;
if (Math.Abs(dir.y) > 1e-3)
{
var d = -(orig.y - 6) / dir.y;
var pt = orig + dir * d;
if (d > 0 && Math.Abs(pt.x) <= 10 && pt.z <= 0 && pt.z >= -30 && d < spheresDist)
{
ceiling = d;
hit = pt;
N = new Vec3f(0, -1, 0);
var c1 = new Vec3f(.3f, .3f, .3f);
var c2 = new Vec3f(.3f, .2f, .1f);
material = new Material(1, new[] { .9f, .1f, .0f, .0f }, new Vec3f(.3f, .3f, .3f), 10);
}
}
dists.Add(ceiling);
var right_wall = float.MaxValue;
if (Math.Abs(dir.x) > 1e-3)
{
// The checkerboard plane has equation y = -4.
var d = -(orig.x - 10) / dir.x;
var pt = orig + dir * d;
if (d > 0 && pt.y <= 6 && pt.y >= -8 && pt.z <= 0 && pt.z >= -30 && d < spheresDist)
{
right_wall = d;
hit = pt;
N = new Vec3f(-1, 0, 0);
var c1 = new Vec3f(0, 1, 0);
var c2 = new Vec3f(.3f, .2f, .1f);
//material.DiffColor = c1;
material = new Material(1, new[] { .9f, .1f, .0f, .0f }, new Vec3f(.1f, .3f, .1f), 10);
}
}
dists.Add(right_wall);
var left_wall = float.MaxValue;
if (Math.Abs(dir.x) > 1e-3)
{
// The checkerboard plane has equation y = -4.
var d = -(orig.x + 10) / dir.x;
var pt = orig + dir * d;
if (d > 0 && pt.y <= 6 && pt.y >= -8 && pt.z <= 0 && pt.z >= -30 && d < spheresDist)
{
left_wall = d;
hit = pt;
N = new Vec3f(1, 0, 0);
var c1 = new Vec3f(1, 0, 0);
var c2 = new Vec3f(.3f, .2f, .1f);
material = new Material(1, new[] { .9f, .1f, .0f, .0f }, new Vec3f(.3f, .1f, .1f), 10);
}
}
dists.Add(left_wall);
var front_wall = float.MaxValue;
if (Math.Abs(dir.z) > 1e-3f)
{
// The checkerboard plane has equation y = -4.
var d = -(orig.z + 30) / dir.z;
var pt = orig + dir * d;
if (d > 0 && pt.y <= 6 && pt.y >= -8 && Math.Abs(pt.x) <= 10 && d < spheresDist)
{
front_wall = d;
hit = pt;
N = new Vec3f(0, 0, 1);
var c1 = new Vec3f(.3f, .3f, .3f);
var c2 = new Vec3f(.3f, .2f, .1f);
material = front_wall_material;
}
}
dists.Add(front_wall);
var back_wall = float.MaxValue;
if (Math.Abs(dir.z) > 1e-3f)
{
// The checkerboard plane has equation y = -4.
var d = -(orig.z) / dir.z;
var pt = orig + dir * d;
if (d > 0 && pt.y <= 6 && pt.y >= -8 && Math.Abs(pt.x) <= 10 && d < spheresDist)
{
front_wall = d;
hit = pt;
N = new Vec3f(0, 0, -1);
var c1 = new Vec3f(.3f, .3f, .3f);
var c2 = new Vec3f(.3f, .2f, .1f);
material = new Material(1, new[] { .9f, .1f, .0f, .0f }, new Vec3f(.1f, .1f, .7f), 10);
}
}
dists.Add(front_wall);
return(dists.Min() < 1000);
}
private static Vec3f Reflect(Vec3f I, Vec3f N)
{
return(I - N * 2f * (I * N));
}
