[SOLVED] Is TriangleSetTopologyModifier::removeTrianglesPostProcessing empty ?

[Weng]

Surprisingly, I found the removeTrianglesPostProcessing is an empty function. Why such a basic function has not been implemented…?
Every time I remove a triangle, the isolated vertices will not be removed.

void TriangleSetTopologyModifier::removeTrianglesPostProcessing(const sofa::helper::vector< unsigned int >& edgeToBeRemoved, const sofa::helper::vector< unsigned int >& vertexToBeRemoved )
{
(void)vertexToBeRemoved;
(void)edgeToBeRemoved;
}

Did I misunderstand the removal of triangles ?

[epernod]

Hi,

this is a method dedicated to child class of TriangleSetTopologyModifier.

It was done based on a “template method” design pattern (if my memory is good)
Basically in the method:

TriangleSetTopologyModifier::removeTriangles(const sofa::helper::vector<unsigned int> &triangleIds,
        const bool removeIsolatedEdges,
        const bool removeIsolatedPoints)

removeTrianglesPreconditions(..) // is called and if the preconditions are fulfill then

removeTrianglesProcess(triangleIds_filtered ,removeIsolatedEdges, removeIsolatedPoints); // do the job and finally

removeTrianglesPostProcessing(edgeToBeRemoved, vertexToBeRemoved); // is called to Arrange the current topology if needed.

if removeIsolatedEdges and removeIsolatedPoints are set to true (which are the default value) then removeTrianglesProcess will remove isolated vertices/edges.
removeTrianglesPreconditions and removeTrianglesPostProcessing have to be implemented in child class if you want to do more job around this removal (for example for Manifold Triangulation, where edges on border need to be oriented).

Hope I was clear. Do not hesitate if you have more question.
You can check the triangle remove interaction in the scene: Demos/TriangleSurfaceCutting.scn using shift + right click

Erik

[Guillaume]

Hi Weng,

Since you didn’t answer back to this topic, I assume your problem is solved.
Please do not hesitate to answer if it’s not.

Regards,
Guillaume.

[Author]

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