public override Vector3D PathShading(ref ShadeRec SR)
{
Vector3D wo = -SR.Ray.Direction;
Vector3D wi;
double pdf;
Vector3D f = DiffuseBRDF.SampleF(ref SR, ref wo, out wi, out pdf);
float NDotWi = (float)(SR.Normal.DotProduct(wi) / pdf);
ReflectRay.Origin = SR.HitPoint;
ReflectRay.Direction = wi;
Vector3D Rslt = SR.World.RayTracer.TraceRay(ref ReflectRay, SR.Depth + 1);
return(new Vector3D(f.X * Rslt.X * NDotWi, f.Y * Rslt.Y * NDotWi, f.Z * Rslt.Z * NDotWi));
}
public override Vector3D AreaLightShade(ref ShadeRec SR)
{
Vector3D Wo = -SR.Ray.Direction;
Vector3D RHO = AmbientBRDF.RHO(ref SR, ref Wo);
Vector3D LtFac = SR.World.AmbientLight.L(ref SR);
Vector3D L = new Vector3D(RHO.X * LtFac.X, RHO.Y * LtFac.Y, RHO.Z * LtFac.Z);
if ((L.X + L.Y + L.Z) <= 0.001f)
{
return(L);
}
foreach (Light Lt in SR.World.Lights)
{
Vector3D Wi = Lt.GetDirection(ref SR).Normalize().ToVector3D();
double NDotWi = SR.Normal.DotProduct(Wi);
if (NDotWi > 0.0)
{
bool bInShadow = false;
if (Lt.EnableCastShadow())
{
ShadowRay.Origin = SR.HitPoint;
ShadowRay.Direction = Wi;
bInShadow = Lt.CheckInShadow(ref ShadowRay, ref SR);
}
if (!bInShadow)
{
RHO = DiffuseBRDF.Factor(ref SR, ref Wo, ref Wi) + SpecularBRDF.Factor(ref SR, ref Wo, ref Wi);
LtFac = Lt.L(ref SR);
float G = Lt.GeoTerms(ref SR) / Lt.PDF(ref SR);
L += new Vector3D(RHO.X * LtFac.X * NDotWi * G, RHO.Y * LtFac.Y * NDotWi * G, RHO.Z * LtFac.Z * NDotWi * G);
}
}
}
return(L);
}
