I have the following facet of a cuboid given by the vertices: V = [-1,-1,-1; 1, 1, -1; -1,1,-1;1, -1,-1]. This facet is the bottom facet of the cuboid. So the outward pointing normal to the cuboid with respect to this facet should be [0 0 -1]. However, with the following MATLAB code, I get the normal, which is [0 0 1], which is inward pointing. What is missing here?
norm_vec = W(:,end)
I see at some places that the vertices should be arranged in the counterclockwise direction to calculate the outward pointing normal.