/// <inheritdoc />
public PixelData GetPixelColor(int x, int y)
{
Debug.WriteLine($"Pixel: ({x}, {y})");
var pixelData = new PixelData(x, y);
using (new BlockTimer(pixelData.SetPixelColorMilliseconds))
{
ColorVector color = ColorVector.Zero;
float xfloat = Convert.ToSingle(x);
float yfloat = Convert.ToSingle(y);
long totalSampleMilliseconds = 0;
if (_renderConfig.NumSamples > 1)
{
for (int sample = 0; sample < _renderConfig.NumSamples; sample++)
{
var sw = Stopwatch.StartNew();
float u = (xfloat + RandomService.Nextfloat()) / _imageWidth;
float v = (yfloat + RandomService.Nextfloat()) / _imageHeight;
var r = _camera.GetRay(u, v);
color += GetRayColor(r, _world, pixelData, 0).DeNan();
sw.Stop();
totalSampleMilliseconds += sw.ElapsedMilliseconds;
}
color /= Convert.ToSingle(_renderConfig.NumSamples);
}
else
{
var sw = Stopwatch.StartNew();
color = GetRayColor(_camera.GetRay(xfloat / _imageWidth, yfloat / _imageHeight), _world, pixelData, 0).DeNan();
totalSampleMilliseconds += sw.ElapsedMilliseconds;
}
pixelData.AverageSampleMilliseconds = totalSampleMilliseconds / _renderConfig.NumSamples;
color = color.DeNan().ApplyGamma2();
// Debug.WriteLine($"Final Color at ({x}, {y}) -> ({color.R}, {color.G}, {color.B})");
pixelData.Color = color;
}
return(pixelData);
}
private ColorVector GetRayColor(Ray ray, IHitable world, PixelData pixelData, int depth)
{
Debug.WriteLine($"Depth: {depth}");
pixelData.SetDepth(depth);
try
{
// the 0.001 corrects for the "shadow acne"
HitRecord hr = world.Hit(ray, 0.001f, float.MaxValue);
if (hr != null)
{
var emitted = hr.Material.Emitted(ray, hr, hr.UvCoords, hr.P);
if (hr.Material is DiffuseLight)
{
Debug.WriteLine($"HIT A LIGHT. Emitted: {emitted}");
}
if (depth < _renderConfig.RayTraceDepth)
{
var scatterResult = hr.Material.Scatter(ray, hr);
if (scatterResult.IsScattered)
{
if (scatterResult.IsSpecular)
{
return(scatterResult.Attenuation * GetRayColor(scatterResult.SpecularRay, world, pixelData, depth + 1));
}
else
{
var p0 = new HitablePdf(_lightHitable, hr.P);
var p = new MixturePdf(p0, scatterResult.Pdf);
var scattered = new Ray(hr.P, p.Generate());
float pdfValue = p.GetValue(scattered.Direction);
var scatteringPdf = hr.Material.ScatteringPdf(ray, hr, scattered);
if (scatteringPdf < 0.01f)
{
scatteringPdf = 0.01f;
// //pdfValue = 1.0f;
}
{
//pdfValue = 1.0f;
}
var depthRayColor = GetRayColor(scattered, world, pixelData, depth + 1);
ColorVector recurseColor = ((scatterResult.Attenuation * scatteringPdf * depthRayColor) / pdfValue);
Debug.WriteLine($"Attenuation ({scatterResult.Attenuation}) ScatteringPdf ({scatteringPdf}) DepthRayColor({depthRayColor}) PdfValue({pdfValue})");
Debug.WriteLine($"emitted: {emitted}");
Debug.WriteLine($"RecurseColor: {recurseColor}");
return(emitted + recurseColor);
}
}
else
{
Debug.WriteLine("NOT SCATTERED");
}
}
return(emitted);
}
if (depth == 0)
{
Debug.WriteLine("depth at 0...");
}
Debug.WriteLine("returning backgroundfunc");
return(_backgroundFunc(ray));
}
finally
{
Debug.WriteLine($"Exiting Depth: {depth}");
}
}
public RenderResult(int x, int y, PixelData pixelData)
{
X = x;
Y = y;
PixelData = pixelData;
}