Ogre Forums

I created a mesh model entity in ogre ,and I want to implement two things in ogre .One is doing manual annotation with the mesh model ,such as mark a human body mesh, different part with different color.Another is exporting 2D images which contains specified information such as the z coordinate of mesh and background pixels that most close to the camera in the scene. How can I implement this two purpose in ogre and which function can I use ?