/// <summary>
/// Basic constructor for the class.
/// </summary>
/// <param name="i"><see cref="HdrImage"/> input parameter</param>
/// <param name="c"><see cref="Camera"/> input parameter</param>
public ImageTracer(HdrImage i, Camera c, int sps = 0)
{
this.image = i;
this.camera = c;
this.pcg = new PCG();
this.samplesPerSide = sps;
}
public PathTracer(World world, Color? bkg = null, PCG? pcg = null, int numOfRays = 10, int maxDepth = 3, int russianRouletteLimit = 2) : base(world, bkg)
{
this.pcg = pcg ?? new PCG();
this.numOfRays = numOfRays;
this.maxDepth = maxDepth;
this.russianRouletteLimit = russianRouletteLimit;
}
public override Ray scatterRay(PCG r, Vec incomingDir, Point interactionPoint, Normal normal, int depth)
{
Vec rayDir = new Vec(incomingDir.x, incomingDir.y, incomingDir.z).Normalize();
Vec normalVec = normal.ToVec().Normalize();
float dotProd = normalVec * rayDir;
return new Ray(
origin: interactionPoint,
dir: rayDir - normalVec * 2f * dotProd,
tm: 1e-5f,
tM: Single.PositiveInfinity,
dep: depth
);
}
public override Ray scatterRay(PCG r, Vec incomingDir, Point interactionPoint, Normal normal, int depth)
{
List<Vec> a = normal.createONBfromZ();
Vec e1 = a[0];
Vec e2 = a[1];
Vec e3 = a[2];
float cosThetaSq = r.randomFloat();
float cosTheta = MathF.Sqrt(cosThetaSq);
float sinTheta = MathF.Sqrt(1.0f - cosThetaSq);
float phi = 2 * MathF.PI * r.randomFloat();
Vec dir = e1 * sinTheta * MathF.Cos(phi) + e2 * sinTheta * MathF.Sin(phi) + e3 * cosTheta;
return new Ray(interactionPoint, dir, tm: 1e-5f, dep: depth);
}
public abstract Ray scatterRay(PCG pcg, Vec incomingDir, Point interactionPoint, Normal normal, int depth);