public Ray GetRay(float s, float t)
{
var lensPos = lensRadius * RayTraceUtility.GetRandomPointInUnitDisk();
var offset = lensPos.x * u + lensPos.y * v;
return(new Ray(Position + offset, LowerLeft + s * Horizontal + t * Vertical - Position - offset));
}
public bool Scatter(Ray rayIn, HitRecord record, ref Color attenuation, ref Ray scatteredRay)
{
var target = RayTraceUtility.Reflect(rayIn.NormalizedDirection, record.Normal);
scatteredRay = new Ray(record.Point, target);
attenuation = albedo;
return(Vector3.Dot(record.Normal, scatteredRay.Direction) > 0);
}
public bool Scatter(Ray rayIn, HitRecord record, ref Color attenuation, ref Ray scatteredRay)
{
var target = record.Point + record.Normal + RayTraceUtility.GetRandomPointInUnitSphere();
scatteredRay = new Ray(record.Point, target - record.Point);
attenuation = albedo;
return(true);
}
static Color GetColorFromHitRecord(Ray ray, HitableList list)
{
var rec = new HitRecord();
if (list.Hit(ray, 0.001f, float.MaxValue, ref rec))
{
var target = rec.Point + rec.Normal + RayTraceUtility.GetRandomPointInUnitSphere();
return(0.5f * GetColorFromHitRecord(new Ray(rec.Point, target - rec.Point), list));
}
var t = (ray.NormalizedDirection.y + 1f) * 0.5f;
return((1 - t) * Color.white + t * new Color(0.5f, 0.7f, 1f));
}
public bool Scatter(Ray rayIn, HitRecord record, ref Color attenuation, ref Ray scatteredRay)
{
Vector3 outwardNormal;
attenuation = Color.white;
var eta = 0f;
var cosi = 0f;
var reflectProb = 0f;
if (Vector3.Dot(rayIn.Direction, record.Normal) > 0)
{
outwardNormal = -record.Normal;
eta = this.eta;
cosi = eta * Vector3.Dot(rayIn.NormalizedDirection, record.Normal);
}
else
{
outwardNormal = record.Normal;
eta = 1f / this.eta;
cosi = -Vector3.Dot(rayIn.NormalizedDirection, record.Normal);
}
var refracted = Vector3.zero;
if (RayTraceUtility.Refract(rayIn.Direction, outwardNormal, eta, ref refracted))
{
reflectProb = RayTraceUtility.Schlick(cosi, eta);
}
else
{
reflectProb = 1f;
}
if (Random.Range(0f, 1f) <= reflectProb)
{
var reflected = RayTraceUtility.Reflect(rayIn.Direction, record.Normal);
scatteredRay = new Ray(record.Point, reflected);
}
else
{
scatteredRay = new Ray(record.Point, refracted);
}
return(true);
}
