Planmeca FIT CAD System User Manual page 133

16 Customizing restoration design
When Material Thickness mode is active, the system colours the proposal
based upon material thickness at each point on the restoration and displays
a legend to indicate the thickness associated with each colour.
The thickness shown represents the shortest distance to the preparation
(green line) and not necessarily the vertical thickness at that point (red line).
User's manual Planmeca FIT CAD/CAM system 125