/// <summary>
/// function to get the max (abs) dimension of the given vertex v
/// </summary>
/// <param name="v"></param>
/// <returns></returns>
private int FindAbsMax(vec3 v)
{
v = v.Abs();// glm.abs(v);
int max_dim = 0;
float val = v.x;
if (v.y > val)
{
val = v.y;
max_dim = 1;
}
if (v.z > val)
{
val = v.z;
max_dim = 2;
}
return(max_dim);
}