public MonteCarloLightingModel(Scene scene, RNG rng, bool nee, bool cosineDist, bool russianRoulette)
{
_scene = scene;
_rng = rng;
_nee = nee;
_cosineDist = cosineDist;
_russianRoulette = russianRoulette;
}
public Stratifier(RNG rng, int width, int height)
{
_rng = rng;
_width = width;
_height = height;
_invWidth = 1f/_width;
_invHeight = 1f/_height;
}
public static RNG[] CreateMultipleRNGs(int count)
{
var m = new Random();
var r = new RNG[count];
for (int i = 0; i < count; i++)
{
r[i] = new RNG(m.Next());
}
return r;
}
public Color3 Sample(Scene scene, Ray ray, RNG rng, bool ignoreLight)
{
if (ray.BouncesLeft < 1)
{
return Color4.Black;
}
//get nearest intersection
var intersection = IntersectionHelper.GetClosestIntersection(ray, scene.Objects);
if (intersection == null)
{
return scene.Skybox.Intersect(ray.Direction);
}
var lightingModel = new MonteCarloLightingModel(scene, rng, nee: true, cosineDist: true, russianRoulette: false);
return lightingModel.Calculate(intersection, ignoreLight);
}
public Color3 Sample(Scene scene, Ray ray, RNG random, bool ignoreLight)
{
//Debug.Assert(scene.BVH != null);
if (ray.BouncesLeft < 1)
{
return Color4.Red;
}
//get nearest intersection
var intersection = IntersectionHelper.GetClosestIntersection(ray, scene.Objects);
if (intersection == null)
{
return scene.Skybox.Intersect(ray.Direction);
}
var lightingModel = new WhittedStyleLightingModel(scene, random);
return lightingModel.Calculate(intersection);
}
public WhittedStyleLightingModel(Scene scene, RNG rng)
{
_scene = scene;
_rng = rng;
}
public Color3 TraceRay(int x, int y, RNG rng)
{
float v = (float)y / Screen.Height;
float u = (float)x / Screen.Width;
Color3 color = new Color3(0,0,0);
var strat = new Stratifier(rng, _sampleSizeX, _sampleSizeY);
for (int i = 0; i < SampleSize; i++)
{
var pos = strat.GetRandomPointInStratum(i);
var dx = pos.X / Screen.Width;
var dy = pos.Y / Screen.Height;
var r = _camera.CreatePrimaryRay(u + dx, v + dy);
color += _scene.Sample(r, rng, false);
}
color /= SampleSize;
return color;
}
public Color3 Sample(Ray ray, RNG random, bool ignoreLight)
{
return _tracer.Sample(this, ray, random, ignoreLight);
}