public override bool Hit(ref Ray ray, double t_min, double t_max, ref Hit_record rec)
{
Vector3 oc = ray.Origin - this.Position;
Vector3 rdir = ray.Destination;
double a = Vector3.Dot(ref rdir, ref rdir);
double b = Vector3.Dot(ref oc, ref rdir);
double c = Vector3.Dot(ref oc, ref oc) - this.Radius * this.Radius;
double disc = b * b - a * c;
if (disc > 0)
{
double tmp = (-b - Math.Sqrt(disc)) / a;
if (tmp < t_max && tmp > t_min)
{
rec.mat_ref = this._material;
rec.t = tmp;
rec.p = ray.Point_to_parameter(ref tmp);
rec.normal = (rec.p - this.Position) / this.Radius;
return(true);
}
tmp = (-b + Math.Sqrt(disc)) / a;
if (tmp < t_max && tmp > t_min)
{
rec.mat_ref = this._material;
rec.t = tmp;
rec.p = ray.Point_to_parameter(ref tmp);
rec.normal = (rec.p - this.Position) / this.Radius;
return(true);
}
}
return(false);
}
public override bool Scatter(ref Ray ray_in, ref Hit_record rec, ref Vector3 attenuation, ref Ray scatered)
{
Vector3 target = rec.normal + Rand_in_unit_spthere();
scatered = new Ray(rec.p, target, 10000.0);
attenuation = _albedo;
return(true);
}
public override bool Scatter(ref Ray ray_in, ref Hit_record rec, ref Vector3 attenuation, ref Ray scatered)
{
Vector3 tmp = Reflect(ray_in.Destination.Normalized(), rec.normal);
scatered = new Ray(rec.p, tmp + _fuzz * Rand_in_unit_spthere(), 10000.0);
tmp = scatered.Destination;
attenuation = _albedo;
return(Vector3.Dot(ref tmp, ref rec.normal) > 0);
}
public override bool Hit(ref Ray ray, double t_min, double t_max, ref Hit_record rec)
{
Hit_record tmp = new Hit_record();
bool did_hit = false;
double closest_hit = t_max;
foreach (var element in _list)
{
if (element.Hit(ref ray, t_min, closest_hit, ref tmp))
{
did_hit = true;
closest_hit = tmp.t;
rec = tmp;
}
}
return(did_hit);
}
public override bool Scatter(ref Ray ray_in, ref Hit_record rec, ref Vector3 attenuation, ref Ray scatered)
{
Vector3 direction = ray_in.Destination, out_norm;
Vector3 reflected = reflect(ref direction, ref rec.normal);
double ni_over_nt;
attenuation = new Vector3(1.0, 1.0, 1.0);
Vector3 refracted = new Vector3(1.0, 1.0, 1.0);
double cosine, ref_prob;
if (Vector3.Dot(ref direction, ref rec.normal) > 0)
{
out_norm = -rec.normal;
ni_over_nt = this._ref_idx;
cosine = Vector3.Dot(ref direction, ref rec.normal) / ray_in.Destination.Length();
cosine = Math.Sqrt(1 - this._ref_idx * this._ref_idx * (1 - cosine * cosine));
}
else
{
out_norm = rec.normal;
ni_over_nt = 1.0 / this._ref_idx;
cosine = -Vector3.Dot(ref direction, ref rec.normal) / ray_in.Destination.Length();
}
if (refract(ref direction, ref out_norm, ref ni_over_nt, ref refracted))
{
ref_prob = schlick(cosine, this._ref_idx);
}
else
{
ref_prob = 1.0;
}
if (this._rand.NextDouble() < ref_prob)
{
scatered = new Ray(rec.p, reflected, 10000000.0);
}
else
{
scatered = new Ray(rec.p, refracted, 10000000.0);
}
return(true);
}
private Vector3 Pixel_color(ref Ray ray, ref Hitable_list hlist, int depth)
{
Hit_record hrec = new Hit_record();
Vector3 v;
if (hlist.Hit(ref ray, 0.001, Double.MaxValue, ref hrec))
{
Ray scatered = new Ray();
Vector3 attenuation = new Vector3(1.0, 1.0, 1.0);
if (depth < this._rebond && hrec.mat_ref.Scatter(ref ray, ref hrec, ref attenuation, ref scatered))
{
return(attenuation * Pixel_color(ref scatered, ref hlist, depth + 1));
}
return(new Vector3(0, 0, 0));
}
else
{
v = ray.Destination.Normalized();
double t = 0.5 * (v[1] + 1.0);
v = (1.0 - t) * new Vector3(1.0, 1.0, 1.0) + t * new Vector3(0.5, 0.7, 1.0);
return(v);
}
}
public abstract bool Scatter(ref Ray ray_in, ref Hit_record rec, ref Vector3 attenuation, ref Ray scatered);
public abstract bool Hit(ref Ray ray, double f_min, double f_max, ref Hit_record rec);
