Color3 Raytracer::shadePixel(const Tri::Intersector& intersector, const Ray& ray, int backwardBouncesLeft) const
{
Color3 pixelColor;
Vector3 position, normal;
Vector2 texCoord;
intersector.getResult(position, normal, texCoord);
SurfaceSample surfaceSample(intersector);
if (_settings._useSuperBSDF)
{
if(_settings._useDirectShading)
{
pixelColor = shadeDirectBSDF(surfaceSample, ray);
}
pixelColor += shadeSpecularBSDF(surfaceSample, -ray.direction(), backwardBouncesLeft);
if (_settings._usePhotonMap)
{
pixelColor += shadeIndirectIllumination(surfaceSample);
}
}
else
{
pixelColor = myShadePixel(intersector, ray, backwardBouncesLeft);
}
return pixelColor;
}
void Raytracer::forwardTrace(Photon* photon, const int bouncesLeft, const int numberOfPhotons)
{
if (bouncesLeft > 0)
{
Tri::Intersector intersector;
float distance = inf();
Ray photonRay(photon->position, photon->direction);
if (_triTree.intersectRay(photonRay, intersector, distance))
{
Color3 pixelColor;
Vector3 position, normal;
Vector2 texCoord;
intersector.getResult(position, normal, texCoord);
photon->position = position + normal * 0.0001f;
Photon* photonCopy = new Photon(photon);
//if (bouncesLeft != _settings._forwardBounces)
{
_photonMap->insert(photon);
}
SurfaceSample surfaceSample(intersector);
if (scatter(intersector, photonCopy))
{
forwardTrace(photonCopy, bouncesLeft - 1, numberOfPhotons);
}
}
}
}
Color3 Raytracer::myShadePixel(const Tri::Intersector& intersector, const Ray& ray, int backwardBouncesLeft) const
{
ray; backwardBouncesLeft;
Vector3 position, normal;
Vector2 texCoord;
intersector.getResult(position, normal, texCoord);
SurfaceSample surfaceSample(intersector);
Color3 lightContribution(0,0,0);
for (int i = 0; i < _currentScene->lighting()->lightArray.length(); ++i)
{
GLight& light = _currentScene->lighting()->lightArray[i];
const float lightDistance = light.distance(position);
const Power3 power = light.power().rgb();
check(power.average());
const float lightArea = 4 * pif() * lightDistance * lightDistance;
const Color3 kx = surfaceSample.lambertianReflect;
const Vector3 light_in = (light.position.xyz() - position).unit();
const float lightIn_dot_normal = light_in.dot(normal);
// Spotlight
if (!isInSpotlight(light, light_in))
{
continue;
}
if (isInShadow(surfaceSample, light_in, lightDistance))
{
continue;
}
Color3 fx(0, 0, 0);
if (lightIn_dot_normal > 0)
{
fx = kx / pif();
}
lightContribution += (power / lightArea) * lightIn_dot_normal * fx;
}
return lightContribution;
}
