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Constructing Simple Transitions

Transition Surfaces

Constructing Ball Corners

 

Learning Technical Surfacing > Transition Surfaces > 

Constructing a Transition Surface at the Rear of the Model

The two spheres act as markers to show the area of the transition surface.

1. Duplicate the edge of the rear surface and move the curve in the X-direction to achieve a similar shape.

   

2. The curve has to be extended. Use the Object Edit > Extend tool.

   

3. Create two additional horizontal curves to follow the edges of the rear surface.

   

4. Switch to the side view and section both curves using the Curve Edit > Curve Section .

   

5. In the side view, project the three curves onto the side surface.

   

   

6. To create blend curves, duplicate the curve-on-surface as curves and then delete the curve-on-surface.

   

7. Having created two blend curves, select the two blend points that are connected to the curves and change their value to a Continuity of G2.

   

8. Create a square surface. Set the options as follows:

   Set this parameter...	To this value
   1 (square)	Set Continuity to CURVATURE, Rebld off
   2 (blend #15)	Set Continuity to FIXED, Rebld off
   3 (rail_surf#6	Set Continuity to CURVATURE, Rebld off
   4 (blend#16)	Set Continuity to FIXED, Rebld off
   Blend Type	LINEAR
   1-3 Boundary Blend	0.500
   2-4 Boundary Blend	0.500
   Explicit Control	on
   U/V Sync Degree	off
   U degree	5
   V degree	5
   U spans	1
   V spans	1
   Max New Spans	0
   Insert at Midpoint	off
   Boundary 1 Colinear	off
   Boundary 2 Colinear	off
   Boundary 3 Colinear	on
   Boundary 4 Colinear	off
   Create History	on
   Auto. Recalc	on
   Boundary Labels	on
   Continuity Check	on

9. Note that edge # 1 does not utilize the ReBld (Rebuild) option.

   

10. Because the resulting CV distribution of the square is not acceptable, set the ReBld option on edge #1 to achieve the desired results.

    

11. Turn on the X, Y, and Z Cross-Sections. To adjust the surface, turn off the CVs to show only the CVs required for the procedure.

    

12. Make the surface invisible, and then use the alignment history to align the curves to their reference.

    

13. After the alignment procedure, make the surface visible again and slide the CVs to fit the transition surface to the scan lines.

    

14. If the modifications were not sufficient to fit the transition surface to the scan lines, modify the rear surface to achieve a better result.

    

Having completed the transition surface from the rear surface, your model should resemble the image below.