public IPhoton GeneratePhoton()
{
float u = (float)RadiosityHelper.RandomDouble;
float v = (float)RadiosityHelper.RandomDouble;
float w = (float)RadiosityHelper.RandomDouble;
float sum = u + v + w;
u /= sum; v /= sum;
Vector3 position = Vector3.BaryCentric(a.position, b.position, c.position, u, v);
position += (Normal * 0.005f);
#region Random Direction
/*float x = ((float)RadiosityHelper.Random.NextDouble() * 2f) - 1f;
* if (x == 0f)
* RadiosityHelper.Random = new Random();
* float y = ((float)RadiosityHelper.Random.NextDouble() * 2f) - 1f;
* if (y == 0f)
* RadiosityHelper.Random = new Random();
* float z = ((float)RadiosityHelper.Random.NextDouble() * 2f)- 1f;
* if (z == 0f)
* RadiosityHelper.Random = new Random();
* Vector3 direction = new Vector3(x, y, z);
* direction.Normalize();*/
#endregion
double f = RadiosityHelper.RandomDoubleRange(2.0, -1.0); // get it within the range of -1 to +1
Vector3 direction = Normal * (float)Math.Cos(f);
return(new Photon(position, direction, color));
}
public DiffuseLight(Vertex[] triangle, RealColor color, float power)
{
a = triangle[0]; b = triangle[1]; c = triangle[2];
this.color = color.Copy();
this.power = power;
Normal = RadiosityHelper.ComputeTriangleNormal(a, b, c);
Center = Vector3.BaryCentric(a.position, b.position, c.position, 0.333333f, 0.333333f);
}