MFnMesh.getTriangles() issue.

[Alejandro]

Hello people !

I've been trying to store faces from combined objects using getTriangles method, but I think I'm using it wrong..

to reproduce the issue, duplicate a sphere, move it a little so you can see, and combine it into a single object, name it as "combined_mesh" then:

```

sel = OpenMayaApi.MSelectionList()

sel.add("combined_mesh")

_dag = sel.getDagPath(0)

_mesh = OpenMayaApi.MFnMesh(_dag)

_, triangles_idx = _mesh.getTriangles()

_, mObject = sel.getComponent(0)

mfn_components = OpenMayaApi.MFnSingleIndexedComponent(mObject)

mfn_object = mfn_components.create(OpenMayaApi.MFn.kMeshPolygonComponent)

mfn_components.addElements(triangles_idx)

selection_list = OpenMayaApi.MSelectionList()

selection_list.add((_dag, mfn_object))

OpenMayaApi.MGlobal.setActiveSelectionList(selection_list)

```

thanks guys.

[Tim Fowler]

MFnMesh::getTriangles doesn't return actual components like faces, it
returns the triangles that Maya used to render the mesh. e.g. a
single quad face has 4 vertices, and Maya has to turn that into two
triangles to render. This function will tell you what vertices it
used to make up those triangles. If you go to Display -> Polygons ->
Face Triangles then you can see them displayed in the viewport. The
"fake" edges Maya used to make up the triangles will be rendered in a
dashed line.

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