public bool IsValid()
{
bool result;
if (V1.IsSame(V2) || V1.IsSame(V3) || V2.IsSame(V3))
{
result = false;
}
else
{
Vector3d vector = V1.Subtract(V2);
Vector3d target = V1.Subtract(V3);
result = !vector.IsParallel(target);
}
return(result);
}
