public void TracePhoton(ref Photon photon, PhotonMap photonMap, PhotonReflection type)
{
bool wasReflection = false;
bool wasCausticReflection = false;
Random rnd = new Random();
for (int i = 0; i < maxReflections; i++)
{
Ray ray = new Ray(new Vector3(photon.position[0], photon.position[1], photon.position[2]), new Vector3(photon.direction[0], photon.direction[1], photon.direction[2]));
//cout << "pozycja " << ray.Origin() << endl;
//cout << "kierunek " << ray.Direction() << endl;
int index = -1;
int j = -1;
double distance = 1000;
bool wasHit = false;
foreach (Mesh mezh in meshes)
{
j++;
if (mezh.Intersect(ref ray))
{
wasHit = true;
}
}
if (!wasHit)
{
break;
}
Mesh mesh = meshes[index];
Vector3 inter = mesh.IntersectV(ref ray);
Vector3 normal = mesh.getNormal(ray, distance, inter);
Color baze = new Color();
if (mesh.faces[0].GetTriangle().GetMaterial() != null)
{
Float2 coords = mesh.getUVCoords(normal, inter);
baze = mesh.faces[0].GetTriangle().GetMaterial().diffuseColor;
}
else
{
baze = mesh.faces[0].GetTriangle().GetMaterial().diffuseColor;
}
float avgColor = (float)((baze.Red() + baze.Green() + baze.Blue()) / 3.0);
float newRed = (float)(photon.energy[0] * baze.Red() / avgColor);
float newBlue = (float)(photon.energy[1] * baze.Blue() / avgColor);
float newGreen = (float)(photon.energy[2] * baze.Green() / avgColor);
if (mesh.faces[0].GetTriangle().GetMaterial() != null)
{
if (!wasCausticReflection && type == PhotonReflection.caustic)
{
break;
}
photon.position[0] = inter.x;
photon.position[1] = inter.y;
photon.position[2] = inter.z;
int probability = rnd.Next() % 100; //prawdopodobienstwo odbicia
if (probability < 40)
{
photonMap.AddPhoton(ref photon);
break;
}
else
{
// cout << "odbicie\n";
//wasReflection = true;
float[] tab = new float[3];
do
{
tab[0] = (float)((rnd.Next() % 10000 - 5000.0) / 5000.0);
tab[1] = (float)((rnd.Next() % 10000 - 5000.0) / 5000.0);
tab[2] = (float)((rnd.Next() % 10000 - 5000.0) / 5000.0);
} while (tab[0] * tab[0] + tab[1] * tab[1] + tab[2] * tab[2] > 1);
for (int m = 0; m < 3; m++)
{
photon.direction[m] = tab[m];
}
if (!wasCausticReflection && type == PhotonReflection.caustic)
{
photon.energy[0] = newRed;
photon.energy[1] = newGreen;
photon.energy[2] = newBlue;
continue;
}
else
{
photonMap.AddPhoton(ref photon);
photon.energy[0] = newRed;
photon.energy[1] = newGreen;
photon.energy[2] = newBlue;
}
}
}
else
{
wasReflection = true;
wasCausticReflection = true;
Ray topoint = new Ray(new Vector3(photon.position[0], photon.position[1], photon.position[2]), inter);
Ray FromPoint = new Ray();
if (mesh.faces[0].GetTriangle().GetMaterial().mirror > 0)
{
FromPoint = mesh.faces[0].GetTriangle().GetMaterial().MirrorRay(ref topoint, ref normal, ref inter);
}
else if (mesh.faces[0].GetTriangle().GetMaterial().refractive > 0)
{
FromPoint = mesh.faces[0].GetTriangle().GetMaterial().RefractRay(ref topoint, ref normal, ref inter, false);
}
photon.position[0] = inter.x;
photon.position[1] = inter.y;
photon.position[2] = inter.z;
Vector3 dir = FromPoint.Direction;
dir.GetNormalized();
photon.direction[0] = dir.x;
photon.direction[1] = dir.y;
photon.direction[2] = dir.z;
photon.energy[0] = newRed;
photon.energy[1] = newGreen;
photon.energy[2] = newBlue;
// cout << "zmienil sie kierunek photonu na " << photon.direction << endl;
}
}
}
public void emitPhotons(ref PhotonMap photonMap, bool causticMap, PhotonReflection type)
{
Random rnd = new Random();
float intensity = lights[0].intensity;
float red = (float)(lights[0].color.Red() * intensity);
float green = (float)(lights[0].color.Green() * intensity);
float blue = (float)(lights[0].color.Blue() * intensity);
while (photonMap.size() < photonMap.maxPhotons)
{
Photon photon = new Photon();
float[] tab = new float[3];
do
{
tab[0] = (float)((rnd.Next() % 10000 - 5000.0) / 5000.0);
tab[1] = (float)((rnd.Next() % 10000 - 5000.0) / 5000.0);
tab[2] = (float)((rnd.Next() % 10000 - 5000.0) / 5000.0);
} while (tab[0] * tab[0] + tab[1] * tab[1] + tab[2] * tab[2] > 1);
photon.position[0] = lights[0].position.x;
photon.direction[0] = tab[0];
photon.position[1] = lights[0].position.y;
photon.direction[1] = tab[1];
photon.position[2] = lights[0].position.z;
photon.direction[2] = tab[2];
photon.position[0] += (float)(((rnd.Next() % 50) / 10.0) - 5.0);
photon.position[2] += (float)(((rnd.Next() % 50) / 10.0) - 5.0);
if (causticMap)
{
bool wasIntesect = false;
Ray ray = new Ray(new Vector3(photon.position[0], photon.position[1], photon.position[2]), new Vector3(tab[0], tab[1], tab[2]));
ray.Direction.GetNormalized();
int index = -1;
double distance = 1000;
foreach (var x in meshes)
{
index++;
double hitDistance = 1000;
if (x.Intersect(ref ray))
{
if (hitDistance < distance)
{
distance = hitDistance;
wasIntesect = true;
}
}
}
if (!wasIntesect)
{
photon = new Photon();
continue;
}
}
photon.energy[0] = red;
photon.energy[1] = green;
photon.energy[2] = blue;
TracePhoton(ref photon, photonMap, type);
photon = new Photon();
}
photonMap.ScaleEnergy();
}
