public override bool Hit(Ray r, float tMin, float tMax, ref HitRecord record)
{
Vec3f oc = r.Origin - Center;
float a = Vec3f.Dot(r.Direction, r.Direction);
float b = Vec3f.Dot(oc, r.Direction);
float c = Vec3f.Dot(oc, oc) - Radius * Radius;
float discriminant = b * b - a * c;
if (discriminant > 0)
{
float tempSqrt = MathF.Sqrt(b * b - a * c);
float temp = (-b - tempSqrt) / a;
if (temp < tMax && temp > tMin)
{
record.t = temp;
record.Point = r.PointAtParameter(record.t);
record.Normal = (record.Point - Center) / Radius;
record.Material = this.Material;
return(true);
}
temp = (-b + tempSqrt) / a;
if (temp < tMax && temp > tMin)
{
record.t = temp;
record.Point = r.PointAtParameter(record.t);
record.Normal = (record.Point - Center) / Radius;
record.Material = this.Material;
return(true);
}
}
return(false);
}
public override bool Hit(Ray r, float tMin, float tMax, ref HitRecord record)
{
if (HitArray == null)
{
HitArray = HitList.ToArray();
}
HitRecord tmpRecord = new HitRecord();
bool flagHitAnything = false;
float closest_so_far = tMax;
foreach (var h in HitArray)
{
if (h.Hit(r, tMin, closest_so_far, ref tmpRecord))
{
flagHitAnything = true;
closest_so_far = tmpRecord.t;
record = tmpRecord;
}
}
return(flagHitAnything);
}
public abstract bool Hit(Ray r, float tMin, float tMax, ref HitRecord record);
public abstract bool Scatter(Ray r, HitRecord rec, out Vec3f attenuation, out Ray Scattered, Random drand);
