public unsafe Color ShadeHit(IntersectionData intersectionData, int remaining = 5)
{
double *x = stackalloc double[ILight.MAX_SAMPLE];
double *y = stackalloc double[ILight.MAX_SAMPLE];
double *z = stackalloc double[ILight.MAX_SAMPLE];
var overPoint = intersectionData.OverPoint;
var eyeVector = intersectionData.EyeVector;
var normal = intersectionData.Normal;
var material = intersectionData.Object.Material;
var shapeColor = material.Pattern.GetColorAtShape(intersectionData.Object, ref overPoint);
var surface = Color.Black;
for (var i = 0; i < Lights.Count; i++)
{
var light = Lights[i];
int nbSamples = light.GetPositions(x, y, z);
double lightIntensity = 0;
var lightColor = Color.Black;
for (int j = 0; j < nbSamples; j++)
{
var sampleLightColor = light.GetIntensityAt(x[j], y[j], z[j], ref overPoint);
lightColor += sampleLightColor;
if (lightColor.Equals(Color.Black))
{
continue;
}
bool isShadowed = IsShadowed(overPoint, x[j], y[j], z[j]);
lightIntensity += isShadowed ? 0 : 1;
}
lightIntensity /= nbSamples;
lightColor /= nbSamples;
surface += material.Lighting(nbSamples, x, y, z, ref overPoint, ref eyeVector, ref normal, lightIntensity, shapeColor, lightColor);
}
var reflected = ReflectedColor(intersectionData, remaining);
var refracted = RefractedColor(intersectionData, remaining);
if (material.Reflective > 0 && material.Transparency > 0)
{
var reflectance = intersectionData.Schlick();
var color = surface + reflected * reflectance + refracted * (1 - reflectance);
return(color);
}
else
{
var color = surface + reflected + refracted;
return(color);
}
}
public Color ReflectedColor(IntersectionData intersectionData, int remaining = 5)
{
var materialReflective = intersectionData.Object.Material.Reflective;
if (remaining == 0 || materialReflective < double.Epsilon)
{
return(Color.Black);
}
var reflectRay = Helper.Ray(intersectionData.OverPoint, intersectionData.ReflectionVector);
var color = ColorAt(reflectRay, remaining - 1);
return(color * materialReflective);
}