User Guide 
User Guide 
User Guide 
 
 
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Tools in the 3D Queries tool box are used to extract curves from B-spline surfaces.
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To  | 
Select in the 3D Queries tool box  | 
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Graphically and numerically evaluate the attributes of a B-spline surface at given locations on the surface.  | 
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Visualize the curvature of a curve or Gaussian curvature of a surface.  | 
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Key-in: DIALOG TOOLBOX EXTRACT [OFF | ON | TOGGLE]