- 
				From the Analysis section of the action bar, click Highlight Lines
						Analysis
					
 .   
			 - 
				Select one or more surfaces to analyze.
			
 - 
				Select the highlight type.
				
					
						- Tangent: The system draws a series of curves on
							the surface. At all points along a given curve, the angle between the
							local principal tangent to the surface and the Robot Z or W axis is constant. The
							angular spacing between each curve is given by the Angle
								Pitch value. The origins of the curves are the points on
							the surface at which the Robot Z or W axis is normal.
								
   
							  
						- Normal: The system draws a series of curves on
							the surface. At all points along a given curve, the angle between the
							local normal to the surface and the Robot Z or W axis is constant. The
							spacing between each curve represents a change in the angle of the local
							normal given by the Angle Pitch value. The
							origins of the curves are the points on the surface at which the Robot Z or W axis is normal.
								
   
							  
					 
					Right-click a line to convert it into a curve. The curves appear in the tree as datum elements. 
				 
			 - 
  
  Click 
	 OK. The analysis
	 is added to the 
	 tree
	 and will be updated automatically whenever you modify any of the input
	 elements.
   
 
  
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