State of the art surface inspection planning requires an expert approach with a lot of trial and error. Because of the lack of available aiding tools, an engineer building inspection systems must rely heavily on his or her experience. In this work we proposed an interactive 3D visualization tool to help an engineer determine good viewpoints. It can be used both as a standalone tool for manual viewpoint placement or as an interface to the inspection planning algorithms giving the engineer a possibility to evaluate and modify automatically generated plans.