Guys I'm in a pickle here - regular scene, cube, uv unwrapped, cycles renderer selected and yet for a love of me I am unable to get pointiness to work.
As mentioned in the comments, on a cube with no curvature,or any type of bevel, you will see no result from the pointiness output of the geometry node.
Pointiness as defined in the manual:
An approximation of the curvature of the mesh per vertex. Lighter values indicate convex angles, darker values indicate concave angles. It allows you to do effects like dirt maps and wear-off effects.
You can see this clearly in the following example:
All objects have the same basic node setup including the default cube on the left.
The node seteup used: