// Create a version of the scene from the end of the first book in the 'Ray Tracing in One Weekend' series.
public static Scene RandomSpheres(Config config)
{
var camera = new Camera(
new Vector3(13.0f, 2.0f, 3.0f),
new Vector3(0.0f, 0.0f, 0.0f),
Vector3.UnitY,
20.0f,
config.ImageAspectRatio,
0.1f,
10.0f,
0.0f,
1.0f
);
var scene = new Scene("random_spheres", camera);
var objects = scene.HitableList;
var groundMaterial = new Lambertian(new Vector3(0.5f, 0.5f, 0.5f));
objects.Add(new Sphere(new Vector3(0.0f, -1000.0f, 0.0f), 1000.0f, groundMaterial));
for (int a = -11; a < 11; a++)
{
for (int b = -11; b < 11; b++)
{
var chooseMat = MathExt.RandomFloat();
var center = new Vector3(a + 0.9f * MathExt.RandomFloat(), 0.2f,
b + 0.9f * MathExt.RandomFloat());
IMaterial material;
if ((center - new Vector3(4.0f, 0.2f, 0.0f)).Length() > 0.9f)
{
if (chooseMat < 0.8f)
{
// Diffuse
var albedo = MathExt.RandomVector3() * MathExt.RandomVector3();
material = new Lambertian(albedo);
var center2 = center + new Vector3(0, MathExt.RandomFloat(0.0f, 0.5f), 0.0f);
objects.Add(new MovingSphere(center, center2, 0.0f, 1.0f, 0.2f, material));
}
else if (chooseMat < 0.95f)
{
// Metal
var albedo = MathExt.RandomVector3(0.5f, 1.0f);
float fuzz = MathExt.RandomFloat(0.0f, 0.5f);
material = new Metal(albedo, fuzz);
objects.Add(new Sphere(center, 0.2f, material));
}
else
{
// Glass
material = new Dielectric(1.5f);
objects.Add(new Sphere(center, 0.2f, material));
}
}
}
}
var material1 = new Dielectric(1.5f);
objects.Add(new Sphere(new Vector3(0.0f, 1.0f, 0.0f), 1.0f, material1));
var material2 = new Lambertian(new Vector3(0.4f, 0.2f, 0.1f));
objects.Add(new Sphere(new Vector3(-4.0f, 1.0f, 0.0f), 1.0f, material2));
var material3 = new Metal(new Vector3(0.4f, 0.2f, 0.1f), 0.0f);
objects.Add(new Sphere(new Vector3(4.0f, 1.0f, 0.0f), 1.0f, material3));
return(scene);
}
public static Scene MovingSphereRing(Config config)
{
var center = new Vector3(0.0f, 2.0f, 0.0f);
var camera = new Camera(
new Vector3(-12.0f, 2.0f, 8.0f),
center,
Vector3.UnitY,
30.0f,
config.ImageAspectRatio,
0.0f,
10.0f,
0.0f,
1.0f
);
var scene = new Scene("moving_sphere_ring", camera);
var objects = scene.HitableList;
var groundMaterial = new Lambertian(new Vector3(0.4f, 0.4f, 0.4f));
objects.Add(new Sphere(new Vector3(0.0f, -1000.0f, 0.0f), 1000.0f, groundMaterial));
// Center metal sphere.
var centerSphereMat = new Metal(new Vector3(0.5f, 0.4f, 0.4f), 0.1f);
float centerSphereRad = 2.0f;
objects.Add(new Sphere(center, centerSphereRad, centerSphereMat));
// Ring of spheres.
int numRingSpheres = 10;
float ringSphereRad = 0.5f;
float endPosOffset = 0.3f;
float yPos = centerSphereRad * 0.5f;
float theta = (MathF.PI * 2.0f) / numRingSpheres;
for (int i = 0; i < numRingSpheres; i++)
{
float angle = (theta * i);
float cos = MathF.Cos(angle);
float sin = MathF.Sin(angle);
float radius = centerSphereRad + 0.1f;
float xPrime = radius * cos - radius * sin;
float zPrime = radius * sin + radius * cos;
IMaterial mat;
if (i % 3 == 0)
{
var albedo = MathExt.RandomVector3(0.5f, 1.0f);
float fuzz = MathExt.RandomFloat(0.0f, 0.5f);
mat = new Metal(albedo, fuzz);
}
else if (i % 4 == 0)
{
mat = new Dielectric(1.5f);
}
else
{
var albedo = MathExt.RandomVector3() * MathExt.RandomVector3();
mat = new Lambertian(albedo);
}
var startPos = new Vector3(xPrime, yPos + 1.0f, zPrime);
var endPos = new Vector3(xPrime + endPosOffset, yPos + 1.0f,
zPrime + endPosOffset);
objects.Add(new MovingSphere(startPos, endPos, 0.0f, 1.0f, ringSphereRad, mat));
}
// Background spheres.
float bgSphereRad = 0.5f;
objects.Add(
new Sphere(new Vector3(center.X + 1.0f, bgSphereRad, center.Z - 8.5f), bgSphereRad,
new Lambertian(MathExt.RandomVector3() * MathExt.RandomVector3())),
new Sphere(new Vector3(center.X - 3.0f, bgSphereRad, center.Z - 6.0f), bgSphereRad,
new Lambertian(MathExt.RandomVector3() * MathExt.RandomVector3()))
);
return(scene);
}