Extract mid-surface from a solid object

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Is there an option in Rhinoceros to extract the mid-surface from a solid object (with varying thickness and complex cross-section geometry?


I assume you want the mid-surface between two face surfaces of a solid.

Use TweenSurfaces with number of surfaces set to 1, and sub-select the desired face surfaces of the solid. When start surface is requested type “srf” and Enter or right click, then select desired face of the solid. Repeat for the end surface. Alternative to typing “srf” and entering/right clicking is to hold down Control and Shift while using the mouse to select the desired surface face.

Sub-selecting is described in http://docs.mcneel.com/rhino/5/help/en-us/commands/selection_commands.htm