Comment réduire le nombre d'arêtes d'une surface importée ?

Article by Alin Vargatu, CSWE updated March 23, 2012

How many times have you imported a neutral format file (STEP, Parasolid, IGES) in SolidWorks and encountered challenges when working on it?
Let me give you an example regarding edges: “How many open edges does the surface from fig. 1 have?”

Fig. 1 - Combien d'arêtes pouvez-vous compter ?

Did you say 1? Did you say 10? Actually the question was unfair, because you cannot count them just by looking at the model.
Let’s select them as input for a feature. All SolidWorks users that are Mold designers know that the Ruled Surface is a very important feature for creating manual parting surfaces, so let’s use it in this example (see fig. 2).

Fig. 2 - The Ruled Surface will have 40 faces as a result of the 40 original edges

Zooming in on a portion of the new ruled surface, we can see a poor result – just too many small faces (fig.3):

Fig. 3 - Too many tiny faces

These many faces are the result of the same number of small edges in the original surface. Fortunately, SolidWorks has a very elegant solution for this problem. Let’s Heal these Edges.
Roll back the feature tree before the creation of the Ruled Surface and apply the “Heal Edges” feature (Insert menu/Faces/Heal Edges) on the edges of the original surface (fig. 4).

Fig. 4 - Heal Edges


As you can see in fig. 4, I asked SolidWorks to merge all edges smaller than 0.1″ with an angular deviation from their neighbours smaller than 1 degree. The result is a reduction in number of edges of more than 50%.

Let’s see what we get when we apply the ruled surface this time (fig. 5):

Fig. 5 - Only 11 Edges - nice improvement

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Alin Vargatu, CSWE

Alin est un ingénieur d'application SOLIDWORKS Elite et un contributeur avide à la communauté SOLIDWORKS. Alin a fait de nombreuses présentations lors de SOLIDWORKS World, de sommets techniques et de réunions de groupes d'utilisateurs, tout en étant très actif sur le forum SOLIDWORKS.