protected internal override double DistanceFrom(Tuple4 point)
{
if (point.IsVector())
{
throw new ArgumentException("Argument is not a point");
}
// If d.x < 0, then -1 < p.x < 1, and same logic applies to p.y, p.z
// So if all components of d are negative, then p is inside the unit cube
// vec3 d = abs(p) - vec3(1.0, 1.0, 1.0);
double dX = Math.Abs(point.X) - 1.0;
double dY = Math.Abs(point.Y) - 1.0;
double dZ = Math.Abs(point.Z) - 1.0;
// Assuming p is inside the cube, how far is it from the surface?
// Result will be negative or zero.
double insideDistance = Math.Min(Math.Max(dX, Math.Max(dY, dZ)), 0.0);
// Assuming p is outside the cube, how far is it from the surface?
// Result will be positive or zero.
if (dX < 0.0)
{
dX = 0.0;
}
if (dY < 0.0)
{
dY = 0.0;
}
if (dZ < 0.0)
{
dZ = 0.0;
}
double outsideDistance = Math.Sqrt(dX * dX + dY * dY + dZ * dZ);
return(insideDistance + outsideDistance);
}
protected internal override double DistanceFrom(Tuple4 point)
{
if (point.IsVector())
{
throw new ArgumentException("Argument is not a point");
}
return(Math.Sqrt(point.X * point.X + point.Y * point.Y + point.Z * point.Z) - 1.0);
}