public static float3 Color(Ray r, HitableArray <Sphere> world, int depth, ref Random rng)
{
var rec = new HitRecord();
if (world.Hit(r, 0.001f, float.MaxValue, ref rec))
{
Ray scattered = new Ray();
float3 attenuation = new float3();
if (depth < 50)
{
if (r.Scatter(rec, ref attenuation, ref scattered, ref rng))
{
return(attenuation * Color(scattered, world, depth + 1, ref rng));
}
}
else
{
// this ray has run out of bounces - draw a black pixel
return(new float3());
}
}
// the ray didn't hit anything, so draw the background color for this pixel
return(Utils.BackgroundColor(ref r));
}
public static float3 Color(Ray r, HitableArray <Sphere> world)
{
var rec = new HitRecord();
if (world.Hit(r, 0f, float.MaxValue, ref rec))
{
var rn = rec.normal;
return(0.5f * new float3(rn.x + 1f, rn.y + 1f, rn.z + 1f));
}
return(Utils.BackgroundColor(ref r));
}
public static HitableArray <Sphere> RandomScene(int n, uint seed = default, Allocator allocator = Allocator.Persistent)
{
var rng = new Random();
rng.InitState(seed);
var list = new HitableArray <Sphere>(n, allocator)
{
[0] = new Sphere(new float3(0, -1000, 0), 1000,
new Material(MaterialType.Lambertian, new float3(0.5f, 0.5f, 0.5f)))
};
var i = 1;
float3 centerComparePoint = new float3(4f, 0.2f, 0f);
for (int a = -11; a < 11; a++)
{
for (int b = -11; b < 11; b++)
{
float chooseMat = rng.NextFloat();
float3 center = new float3(a + 0.9f * rng.NextFloat(), 0.2f, b + 0.9f * rng.NextFloat());
if (!(math.length(center - centerComparePoint) > 0.9f))
{
continue;
}
if (chooseMat < 0.8f) // diffuse
{
var diffuseMat = new Material(MaterialType.Lambertian, RandomFloat3(ref rng));
list[i++] = new Sphere(center, 0.2f, diffuseMat);
}
else if (chooseMat < 0.95f) // metal
{
var metalMat = new Material(MaterialType.Metal, RandomFloat3(ref rng));
list[i++] = new Sphere(center, 0.2f, metalMat);
}
else // glass
{
var metalMat = new Material(MaterialType.Dielectric, RandomFloat3(ref rng));
list[i++] = new Sphere(center, 0.2f, metalMat);
}
}
}
list[i++] = new Sphere(new float3(0, 1, 0), 1f,
new Material(MaterialType.Dielectric, float3.zero, 0f, 1.5f));
list[i++] = new Sphere(new float3(-4, 1, 0), 1f,
new Material(MaterialType.Lambertian, new float3(0.4f, 0.2f, 0.1f), 0f, 1.5f));
list[i] = new Sphere(new float3(4, 1, 0), 1f,
new Material(MaterialType.Metal, new float3(0.7f, 0.6f, 0.5f)));
return(list);
}
public float3 Color(Ray r, HitableArray <Sphere> world)
{
var rec = new HitRecord();
if (recursionCounter < maxHits && world.Hit(r, 0.001f, float.MaxValue, ref rec))
{
recursionCounter++;
var target = rec.p + rec.normal + Utils.RandomInUnitSphere(random);
return(absorbRate * Color(new Ray(rec.p, target - rec.p), world));
}
return(Utils.BackgroundColor(ref r));
}
void Start()
{
m_MainCamera = UnityEngine.Camera.main;
Spheres = new HitableArray <Sphere>(0);
UpdateWorld();
}