private RGBColor SampleLight(Vector2 uv, Scene scene, Vector2 lightSampleDirection, int maxRecursionDepth = 16)
{
var ray = new Ray(uv, lightSampleDirection);
(var t, var shape) = Raymarcher.March(ray);
if (t < Raymarcher.MinMarchDistance)
{
return(shape.Material.DiffuseColor);
}
if (t < Raymarcher.MaxMarchDistance)
{
if (shape.Material.Reflectivity > 0 && maxRecursionDepth > 0)
{
var p = ray.GetPoint(t);
var normal = scene.NormalAtPoint(p);
var reflectedRay = Vector2.Reflect(lightSampleDirection, normal);
var light = shape.Material.Intensity * shape.Material.EmissiveColor;
var reflected = SampleLight(p + 0.001 * reflectedRay, scene, reflectedRay, maxRecursionDepth - 1);
return((1.0 - shape.Material.Reflectivity) * light + shape.Material.Reflectivity * reflected);
}
// TODO: Refraction
return(shape.Material.Intensity * shape.Material.EmissiveColor);
}
else if (t > Raymarcher.MaxMarchDistance)
{
return(scene.AmbientColor);
}
return(RGBColor.Black);
}
public void Render(Camera camera, Scene scene, string outputFileName)
{
WriteRenderInfo(camera);
var nmd = new NormalMapDebugger(camera, scene);
SceneDistanceBuffer = new SceneDistanceBuffer(camera, scene);
SceneDistanceBuffer.SaveToFile();
Status = new RenderStatus(camera.DevicePixelHeight);
Raymarcher = new Raymarcher(scene, SceneDistanceBuffer);
var nCores = Environment.ProcessorCount;
var yLines = Enumerable.Range(0, camera.DevicePixelHeight).ToList();
Parallel.ForEach(yLines, (y) => RenderRow(camera, scene, y));
Console.WriteLine();
camera.SaveToFile(outputFileName);
}