Flat shading with Libgdx 3D

I’m trying to achieve this look in Libgdx.

Can anyone share some insight on how to achieve this?

Make the three normals of each triangle point in the same direction. N.B.: this prevents vertex sharing.

Thanks man, that put me on the right track.

I worked out how to fix the normals in Blender with Mesh -> Edges -> Edge Split.

http://wiki.blender.org/index.php/Doc:2.6/Manual/Modeling/Meshes/Smoothing

I found out this can also be done with an Edge Split modifier. This is probably the better way, as it will keep your models intact while editing, only splitting the edges when you apply the modifiers on export.