Clip Plane
            
            Views > Edit > Update > Clip plane...
You can use so-called "clip planes" to cut shaded 3-D models dynamically with the mouse. This is useful, for example, if you want to see or display the interior of a shaded model. Once defined, dynamic sections are saved with the drawing, can be shown or hidden at any time at the press of a button and very quickly changed, if required.
                
            
(1) 3-D model, (2) Section with yz-plane as clip plane, (3) Section with xy-plane as clip plane
To cut a shaded 3-D view dynamically using a clip plane, activate the appropriate view, select Views > Edit > Clip...
 , then select the desired Clip plane function: 
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                         Clip plane - Change existing The current clip plane continues to be used. If no clip plane has been defined yet, the clip plane is placed in the xy-plane of the current coordinate system.  | 
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                         Clip plane - Parallel to screen plane The clip plane is the screen plane.  | 
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                         Clip plane - Parallel to processing plane The clip plane is the active processing plane.  | 
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                         Parallel to XY-plane The clip plane is the xy-plane of the active coordinate system.  | 
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                         Parallel to XZ-plane The clip plane is the xz-plane of the active coordinate system.  | 
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                         Parallel to YZ-plane The clip plane is the yz-plane of the active coordinate system.  | 
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                         Switch on 
 Switches off the clip plane and thus hides the section.  | 
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                         Switch off Shows the section and switches on the clip plane.  | 
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Now use the mouse to move the clip plane to cut your model dynamically. During cutting, you can right-click to call a context menu containing further functions:
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                         Move Moves the clip plane with the mouse.  | 
                
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                         Rotate Rotates the clip plane with the mouse.  | 
                
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                         Apply Applies the current display and ends the function.  | 
                
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                         Switch off Switches off the clip plane and thus hides the section.  | 
                
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                         Cancel Cancels the function without changing the section.  | 
                
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                         Inner faces in surface colour Displays the inner faces in the surface colour.  | 
                
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                         Inner faces in different colour Displays the inner faces in a different colour.  | 
                
Click to apply the current representation.
                
 The function affects all parts of the corresponding 
 view! 
                
            
                        
                        
                        
                        
                        
                        
                        
                        
                        
                        
                        
                        
                        
                        
                        