public override (SurfaceInteraction, double) Sample()
{
// TODO: Implement Sphere sampling
if (Outside)
{
var pObj = this.Radius * Samplers.UniformSampleSphere();
var n = new Vector3(pObj.x, pObj.y, pObj.z);
var pdf = 1 / this.Area();
var dpdu = new Vector3(-pObj.y, pObj.x, 0);
SurfaceInteraction si = new SurfaceInteraction(pObj, n, Vector3.ZeroVector, dpdu, this);
return(ObjectToWorld.Apply(si), pdf);
}
else
{
var pObj = this.Radius * Samplers.UniformSampleSphere();
var n = new Vector3(pObj.x, pObj.y, pObj.z);
var pdf = 1 / this.Area();
var dpdu = new Vector3(-pObj.y, pObj.x, 0);
SurfaceInteraction si = new SurfaceInteraction(pObj, -n, Vector3.ZeroVector, dpdu, this);
return(ObjectToWorld.Apply(si), pdf);
}
// TODO: Return surface interaction and pdf
// A dummy return example
//double dummyPdf = 1.0;
//Vector3 dummyVector = new Vector3(0, 0, 0);
//SurfaceInteraction dummySurfaceInteraction = new SurfaceInteraction(dummyVector, dummyVector, dummyVector, dummyVector, this);
//return (dummySurfaceInteraction, dummyPdf);
}
public override (SurfaceInteraction, double) Sample()
{
var pObj = Samplers.UniformSampleSphere() * Radius;
pObj *= Radius / pObj.Length(); // refine
var n = pObj.Normalize();
var dpdu = new Vector3(-pObj.y, pObj.x, 0);
var pdf = 1 / Area();
return(ObjectToWorld.Apply(new SurfaceInteraction(pObj, n, Vector3.ZeroVector, dpdu, this)), pdf);
}
public override (SurfaceInteraction, double) Sample()
{
Vector3 sample = Samplers.UniformSampleSphere();
Vector3 point = sample * Radius;
Vector3 normal = sample;
Vector3 dpdu = new Vector3(-normal.y, normal.x, 0.0);
double pdf = 1.0 / Area();
SurfaceInteraction si = new SurfaceInteraction(point, normal, Vector3.ZeroVector, dpdu, this);
return(ObjectToWorld.Apply(si), pdf);
}
public override (Spectrum, Vector3, double) Sample_f(Vector3 wo)
{
//var wi = Samplers.CosineSampleHemisphere();
var wi = Samplers.UniformSampleSphere();
if (wo.z < 0)
{
wi.z *= -1;
}
double pdf = Pdf(wo, wi);
return(f(wo, wi), wi, pdf);
}
public override (SurfaceInteraction, double) Sample()
{
// TODO: Implement Sphere sampling
//Vector3 pObj = Samplers.CosineSampleHemisphere() * Radius;
Vector3 pObj = Samplers.UniformSampleSphere() * Radius;
pObj = pObj * (Radius / pObj.Length());
// TODO: Return surface interaction and pdf
var dpdu = new Vector3(-pObj.y, pObj.x, 0);
double pdf = 1 / Area(); // a je kle inv 4 PI (1/Math.PI/4)
return(ObjectToWorld.Apply(new SurfaceInteraction(pObj, ObjectToWorld.ApplyNormal(pObj), Vector3.ZeroVector, dpdu, this)), pdf);
}
public override (SurfaceInteraction, double) Sample()
{
// TODO: Implement Sphere sampling
var center = new Vector3(0, 0, 0);
var point = center + Radius * Samplers.UniformSampleSphere();
var normal = point.Normalize();
if (innerOrientation)
{
normal = -normal;
}
point *= Radius / (center - point).Length();
var wo = point;
var dpdu = Dpdu(point);
var interaction = new SurfaceInteraction(point, normal, wo, dpdu, this);
return(ObjectToWorld.Apply(interaction), Pdf(interaction, point));
}
