private static void ShowSceneDef(SceneDefinition sceneDef)
{
Console.WriteLine("=====================================");
Console.WriteLine("ImageWidth: " + sceneDef.ImageWidth);
Console.WriteLine("ImageHeight: " + sceneDef.ImageHeight);
Console.WriteLine("NumSamples: " + sceneDef.NumSamples);
Console.WriteLine("ChunkSize: " + sceneDef.ChunkSize);
Console.WriteLine("CameraLookFrom: " + string.Join(", ", sceneDef.CameraLookFrom));
Console.WriteLine("CameraLookAt: " + string.Join(", ", sceneDef.CameraLookAt));
Console.WriteLine("CameraFocusDistance: " + sceneDef.CameraFocusDistance);
Console.WriteLine("CameraAperture: " + sceneDef.CameraAperture);
}
private static void RenderPart(int i, int j, SceneDefinition sceneDef, Camera cam, IHitable world, StringBuilder output)
{
var col = new Vec3();
for (var s = 0; s < sceneDef.NumSamples; s++)
{
var u = (i + Utils.NextFloat()) / sceneDef.ImageWidth;
var v = (j + Utils.NextFloat()) / sceneDef.ImageHeight;
var r = cam.GetRay(u, v);
col += Color(r, world, 0);
}
col /= sceneDef.NumSamples;
// gamma correction
col = new Vec3((float)Math.Sqrt(col.R), (float)Math.Sqrt(col.G), (float)Math.Sqrt(col.B));
var ir = (int)(255.99 * col[0]);
var ig = (int)(255.99 * col[1]);
var ib = (int)(255.99 * col[2]);
output.AppendLine($"{ir} {ig} {ib}");
}
private static void Render(SceneDefinition sceneDef, StringBuilder output)
{
/*var world = new HitableList()
* {
* new Sphere(new Vec3(0.0f, 0.0f, -1.0f), 0.5f, new Lambertian(new Vec3(0.8f, 0.3f, 0.3f))),
* new Sphere(new Vec3(0.0f, -100.5f, -1.0f), 100.0f, new Lambertian(new Vec3(0.8f, 0.8f, 0.0f))),
* new Sphere(new Vec3(1.0f, 0.0f, -1.0f), 0.5f, new Metal(new Vec3(0.8f, 0.6f, 0.2f), 1.0f)),
*
* // make bubble by having a smaller sphere with negative radius
* new Sphere(new Vec3(-1.0f, 0.0f, -1.0f), 0.5f, new Dielectric(1.5f)),
* new Sphere(new Vec3(-1.0f, 0.0f, -1.0f), -0.45f, new Dielectric(1.5f)),
* };*/
var world = new BvhNode(RandomScene());
// var world = TwoPerlinSpheres();
var lookFrom = new Vec3(sceneDef.CameraLookFrom[0], sceneDef.CameraLookFrom[1], sceneDef.CameraLookFrom[2]);
var lookAt = new Vec3(sceneDef.CameraLookAt[0], sceneDef.CameraLookAt[1], sceneDef.CameraLookAt[2]);
var focusDistance = sceneDef.CameraFocusDistance;
var aperture = sceneDef.CameraAperture;
var cam = new Camera(lookFrom, lookAt, new Vec3(0.0f, 1.0f, 0.0f), 20.0f, sceneDef.ImageWidth / (float)sceneDef.ImageHeight, aperture, focusDistance);
var totalCount = sceneDef.ImageWidth * sceneDef.ImageHeight;
var currentCount = 0;
var sw = new Stopwatch();
sw.Start();
output.AppendLine($"P3\n{sceneDef.ImageWidth} {sceneDef.ImageHeight}\n255");
if (sceneDef.ChunkSize > 0)
{
var chunks = Enumerable.Range(0, totalCount).Chunk(sceneDef.ChunkSize * sceneDef.ChunkSize).ToArray();
var bag = new ConcurrentBag <Tuple <int, StringBuilder> >();
var progress = new Progress <int>(cnt => ReportProgress(cnt, totalCount, sw.Elapsed)) as IProgress <int>;
Parallel.ForEach(chunks, chunk =>
{
var chunkOutput = new StringBuilder();
foreach (var idx in chunk)
{
var i = idx % sceneDef.ImageWidth;
var j = sceneDef.ImageHeight - 1 - idx / sceneDef.ImageWidth;
RenderPart(i, j, sceneDef, cam, world, chunkOutput);
Interlocked.Increment(ref currentCount);
progress.Report(currentCount);
}
bag.Add(new Tuple <int, StringBuilder>(chunk.First(), chunkOutput));
});
foreach (var tuple in bag.OrderBy(x => x.Item1))
{
output.Append(tuple.Item2);
}
}
else
{
for (var j = sceneDef.ImageHeight - 1; j >= 0; j--)
{
for (var i = 0; i < sceneDef.ImageWidth; i++)
{
RenderPart(i, j, sceneDef, cam, world, output);
ReportProgress(++currentCount, totalCount, sw.Elapsed);
}
}
}
sw.Stop();
Console.WriteLine($"\nElapsed: {sw.Elapsed.Hours:00}:{sw.Elapsed.Minutes:00}:{sw.Elapsed.Seconds:00}");
}