public override bool Scatter(Vector3 normal, Ray ray)
{
Vector3 outwardNor;
double cos, niByNt, reflectProb;
var rDn = Vector3.Dot(ray.direction, normal);
if (rDn > 0)
{
outwardNor = normal * (-1f);
niByNt = reflectiveIdx;
cos = reflectiveIdx * rDn;
}
else
{
outwardNor = normal;
niByNt = 1 / reflectiveIdx;
cos = -rDn;
}
Vector3 refractedDir;
if (Vector3.Refract(ray.direction, outwardNor, niByNt, out refractedDir))
{
reflectProb = Schlik(cos);
ray.origin = ray.GetHitPiont();
ray.direction = CoreRandom.Sample() < reflectProb?Vector3.Reflect(ray.direction, normal) : refractedDir;
}
else
{
ray.origin = ray.GetHitPiont();
ray.direction = Vector3.Reflect(ray.direction, normal);
}
return(true);
}
public virtual bool Scatter(Ray ray)
{
Vector3 geoNor = GetGeoNormal(ray.GetHitPiont());
if (material.Scatter(geoNor, ray))
{
ray.hitPos = float.PositiveInfinity;
ray.hitDepth--;
return(true);
}
else
{
ray.hitDepth = 0;
return(false);
}
}
public override bool Scatter(Vector3 normal, Ray ray)
{
Vector3 scatteredDir = Vector3.Reflect(ray.direction, normal);
scatteredDir += roughness * CoreRandom.SampleUnitSphere();
if (Vector3.Dot(scatteredDir, normal) > 0)
{
ray.origin = ray.GetHitPiont();
ray.direction = scatteredDir;
return(true);
}
else
{
return(false);
}
}
public override bool Scatter(Vector3 normal, Ray ray)
{
ray.origin = ray.GetHitPiont();
ray.direction = normal + CoreRandom.SampleUnitSphere();
return(true);
}