static HitableList()
{
DefaultWorld = new HitableList {
//Bottom "plane"
new Sphere(new Vec3(0, -1000, 0), 1000, new Lambertain(new Vec3(0.5F, 0.5F, 0.5F))),
// three large spheres
new Sphere(new Vec3(4, 1, 0), 1.0F, new Dielectric(1.5F)),
new Sphere(new Vec3(-4, 1, 0), 1.0F, new Lambertain(new Vec3(0.4F, 0.2F, 0.1F))),
new Sphere(new Vec3(0, 1, 0), 1.0F, new Metal(new Vec3(0.7F, 0.6F, 0.5F), 0.0F))
};
// numerous small sphere
RandomizeWorld(DefaultWorld);
}
public Vec3 GetColor(Ray ray, HitableList scene, int depth)
{
if (depth == 0)
{
return(new Vec3(0, 0, 0));
}
var hit = scene.GetNearestHit(ray, 0.0001F);
if (hit != null)
{
var result = hit.Material.Scatter(ray, hit);
if (result != default)
{
return(GetColor(result.ray, scene, depth - 1) * result.color);
}
}
var t = (MathR.Normalize(ray.Direction).Y + 1) * 0.5F;
return((new Vec3(1, 1, 1) * (1.0F - t)) + (new Vec3(0.5F, 0.7F, 1) * t));
}
private static void RandomizeWorld(HitableList world)
{
for (var a = -11; a < 11; a++)
{
for (var b = -11; b < 11; b++)
{
var chooseMat = Rand.Rand01();
var center = new Vec3(a + (0.9F * Rand.Rand01()), 0.2F, b + (0.9F * Rand.Rand01()));
if ((center - new Vec3(4, 0.2F, 0)).Lenght() > 0.9F)
{
if (chooseMat < 0.8F)
{
// diffuse
var albedo = Vec3.Random() * Vec3.Random();
world.Add(new Sphere(center, 0.2F, new Lambertain(albedo)));
}
else if (chooseMat < 0.95)
{
// metal
var albedo = Rand.Rand01();
var albedo2 = Rand.Rand01();
var albedo3 = Rand.Rand01();
var fuzz = Rand.Rand01();
world.Add(new Sphere(center, 0.2F, new Metal(new Vec3(albedo, albedo2, albedo3), fuzz)));
}
else
{
// glass
world.Add(new Sphere(center, 0.2F, new Dielectric(Rand.Uniform(0.5F, 1.5F))));
}
}
}
}
}