public override bool DistanceToRay(Ray ray, HitResult result)
{
var pos = Transform.Translation;
float a = VMath.Dot(ray.vec, pos - ray.pos);
float e = (pos - ray.pos).LengthSquare();
float f = Range * Range - e + a * a;
if (f < 0)
{
return(false);
}
float distance = a - (float)Math.Sqrt(f);
if (result.distance > distance && distance > 0.05)
{
result.normal = VMath.Normalize((ray.pos + ray.vec * distance) - pos);
result.material = Material;
result.distance = distance;
return(true);
}
else
{
return(false);
}
}
public virtual void Scatter(Ray ray, Vector3 normal, Vector2 uv, Vector3 pos, out Vector3 vec, out Vector3 albedo)
{
float dot = VMath.Dot(normal, ray.vec);
albedo = Albedo.GetColor(uv) * Math.Abs(dot);
vec = CreateReflectedVector(ray, normal, pos);
}
public float[] Forward(float[] input)
{
System.Array.Copy(input, this.input, inputNum);
for (int i = 0; i < neuronNum; i++)
{
active[i] = VMath.Tanh(VMath.Dot(weights[i].w, input) + bias[i]);
}
return(active);
}
public float CalculateTimeToIntersectWithRay(Ray ray)
{
float dot = VMath.Dot(Normal, ray.vec);
if (Math.Abs(dot) <= 1E-6)
{
return(1E+6F);
}
return(VMath.Dot(Normal, Pos - ray.pos) / dot);
}
protected Vector3 CreateReflectedVector(Ray ray, Vector3 normal, Vector3 pos)
{
if (Rand.NextDouble() < Roughness)
{
var vec = new Vector3((float)Rand.NextDouble() * 0.5F - 0.25F, 3, (float)Rand.NextDouble() * 0.5F - 0.25F) - pos;
if (VMath.Dot(vec, normal) > 0)
{
return(VMath.Normalize(vec));
}
}
return(Vector3.Interpolate(Reflect(ray.vec, normal), RandomCosineDirection() * Matrix3.LookAt(normal, RandomCosineDirection()), Roughness));
}
public bool IsIntersectWithRay(Ray ray)
{
var target = Pos - ray.pos;
float time = VMath.Dot(VMath.Normalize(ray.vec), target);
if (time <= 0)
{
return(false);
}
float distance = target.LengthSquare() - time * time;
return(distance <= Range * Range);
}
public bool IsIntersectWithRay(Ray ray)
{
var cross1 = VMath.Cross(Pos2 - Pos1, ray.pos - Pos1);
var dot1 = VMath.Dot(cross1, ray.vec);
var cross2 = VMath.Cross(Pos3 - Pos2, ray.pos - Pos2);
var dot2 = VMath.Dot(cross2, ray.vec);
if (dot1 > 0 ^ dot2 > 0)
{
return(false);
}
var cross3 = VMath.Cross(Pos1 - Pos3, ray.pos - Pos3);
var dot3 = VMath.Dot(cross3, ray.vec);
return(!(dot2 > 0 ^ dot3 > 0));
}
public float CalculateTimeToIntersectWithRay(Ray ray)
{
float a0 = ray.vec.LengthSquare();
float a1 = VMath.Dot(ray.vec, Pos - ray.pos);
float a2 = (Pos - ray.pos).LengthSquare() - Range * Range;
float d = a1 * a1 - a0 * a2;
if (d < 0)
{
return(1E+6F);
}
float d2 = (float)Math.Sqrt(d);
if (-a1 - d2 >= 0)
{
return(-(a1 + d2) / (2 * a0));
}
else
{
return(-(a1 - d2) / (2 * a0));
}
}
public Vector3 Reflect(Vector3 vec, Vector3 nornal)
{
return(VMath.Normalize(vec - 2 * VMath.Dot(vec, nornal) * nornal));
}
public Vector3 GetColor(Ray ray)
{
return(VMath.Dot(Pos, ray.vec) > 0.995 ? Color : new Vector3(1, 1, 1) * 0.1F);
}
public bool IsIntersectWithRay(Ray ray)
{
return(Math.Abs(VMath.Dot(Normal, ray.vec)) > 1E-6);
}
