Many types of polygon vertices cannot be deleted using the key. For example, while you can delete border vertices on the exterior of a mesh using the key when the selected vertex shares only two edges, you cannot use the key to delete a vertex when it shares more than two edges.
When an interior vertex is deleted using Delete Edge/Vertex, any edges associated with the deleted vertices are also removed as a result. The polygon faces surrounding the deleted vertex are replaced with a single n-sided polygon created from the vertices surrounding the deleted vertex. Maya does not use quads and triangles in the affected area in order to reduce the number of polygons.
When the edges of a polygonal mesh are deleted using the key the selected edge is deleted but not the shared vertices at either ends of the edge. if you want to delete the shared vertices associated with the deleted edges you must use . You can only delete interior edges on a mesh using the Delete Edge/Vertex feature.
If you try to delete interior vertices with the key, Maya will display a warning message that it cannot delete the vertices because they have “complex edge attachment”. That is, the vertices are connected to more than two edges.
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