public Image <Rgba32> Render(Camera camera, IHitable world)
{
var stopwatch = new Stopwatch();
stopwatch.Start();
var image = new Image <Rgba32>(this.imageWidth, this.imageHeight);
Console.WriteLine("Rendering scene... ");
using var progress = new ProgressBar();
{
int completeLines = 0;
Parallel.For(0, this.imageHeight, j =>
{
Span <Rgba32> rowSpan = image.GetPixelRowSpan(this.imageHeight - j - 1);
for (int i = 0; i < this.imageWidth; i++)
{
Vector3 colour = Vector3.Zero;
for (int s = 0; s < this.samplesPerPixel; s++)
{
float u = (float)(i + StaticRandom.NextDouble()) / this.imageWidth;
float v = (float)(j + StaticRandom.NextDouble()) / this.imageHeight;
Ray ray = camera.GetRay(u, v);
colour += Colour(in ray, world, 0);
}
colour /= (float)this.samplesPerPixel;
colour = new Vector3((float)Math.Sqrt(colour.X), (float)Math.Sqrt(colour.Y),
(float)Math.Sqrt(colour.Z));
rowSpan[i] = new Rgba32(colour);
}
private static IHitable CreateRandomScene()
{
var hitables = new List <IHitable>(500);
hitables.Add(new Sphere(new Vector3(0f, -1000f, 0f), 1000f, new Lambertian(new Vector3(0.5f, 0.5f, 0.5f))));
for (int a = -11; a < 11; a++)
{
for (int b = -11; b < 11; b++)
{
float randomMat = (float)StaticRandom.NextDouble();
var center = new Vector3(a + 0.9f * (float)StaticRandom.NextDouble(), 0.2f, b + 0.9f * (float)StaticRandom.NextDouble());
if ((center - new Vector3(4f, 0.2f, 0f)).Length() > 0.9f)
{
if (randomMat < 0.8f) //diffuse
{
hitables.Add(new Sphere(center, 0.2f, new Lambertian(new Vector3((float)StaticRandom.NextDouble() * (float)StaticRandom.NextDouble(), (float)StaticRandom.NextDouble() * (float)StaticRandom.NextDouble(), (float)StaticRandom.NextDouble() * (float)StaticRandom.NextDouble()))));
}
else if (randomMat < 0.95f) //metal
{
hitables.Add(new Sphere(center, 0.2f, new Metal(new Vector3(0.5f * (1f + (float)StaticRandom.NextDouble()), 0.5f * (1 + (float)StaticRandom.NextDouble()), 0.5f * (float)StaticRandom.NextDouble()), 0.2f)));
}
else //glass
{
hitables.Add(new Sphere(center, 0.2f, new Dielectric(1.5f)));
}
}
}
}
hitables.Add(new Sphere(new Vector3(0f, 1f, 0f), 1.0f, new Dielectric(1.5f)));
hitables.Add(new Sphere(new Vector3(-4f, 1f, 0f), 1.0f, new Lambertian(new Vector3(0.4f, 0.2f, 0.1f))));
hitables.Add(new Sphere(new Vector3(4f, 1f, 0f), 1.0f, new Metal(new Vector3(0.7f, 0.6f, 0.5f), 0f)));
return(new HitableCollection(hitables));
}
private Vector3 GetRandomInUnitDisk()
{
Vector3 point;
do
{
point = 2f * new Vector3((float)StaticRandom.NextDouble(), (float)StaticRandom.NextDouble(), 0) -
new Vector3(1f, 1f, 0f);
} while (Vector3.Dot(point, point) >= 1f);
return(point);
}