An introductory modeling sample

We'll apply the Advanced GSM command to a skin: a set of surfaces describing a shape (please refer to the Introductory Examples for the basic information you need to better understand this document).
 

1. Load file "GM_EX_04.e3" and start the Advanced GSM command. In this case we have a skin, a set of 3 surfaces that are trimmed and tangent.
   
   
    
2. Now, referring to The Advanced GSM Command User Interface, you will have the following:
   • What to Modify: Three surfaces (a skin)
   • What to Preserve: The outer green boundary. How: Keeping position
   • What to Match: one of tangent curves with another one. How: Target position.
      
3. Select the three surfaces.
    
4. Click on Curves (Group1) under Preserving Curves and select the green boundaries (you can use the Selection Filter command and set the color to green. Then use Select All.). In the Constraint drop-down list select Keep position:
   
   
    
5. Under Matching Curves, click on Initial curves and select the blue curves (you can use the Selection Filter command and set the color to blue). Then click on Target curves and select the red curves. Set the Constraint drop-down list to Target position.
   
   
    
6. This is the result when you click :
   
   
    
   
   

   Note We didn't actually apply a transformation, but rather a set of rules (matching, preserving) to a set of existing rules (tangency between trimmed surfaces). The initial surfaces are untrimmed an re-trimmed all at once according to the new rules in order to obtain the desired result.

   
   
7. In order to achieve a more suitable shape, some Shape Control tools are available: Stiffness, Roundness, Bulge (see also "Set the parameters controlling the shape of the resulting surfaces"). Click Shape Control under More Options.
   Let's change the Bulge factor. In this case, changing from Small to Medium, a suitable shape is achieved.
   
   
    

   Bulge: Small	Bulge: Medium