UE::Geometry::GetSelectionBoundaryVertices

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Description

Given a selection, return the vertex IDs of the vertices on the boundary of this selection. A selected vertex is considered to be on the boundary either if it is on the actual mesh boundary (for an open mesh) or it is connected to a triangle element that is not part of the selection (i.e. if the vertex has a neighbor vertex not in selection for a selection of type EGeometryElementType::Vertex, or an adjacent edge not in selection for a selection of type EGeometryElementType::Edge, an adjacent triangle not in the selection for a selection of type EGeometryElementType::Face).

For selections of type EGeometryTopologyType::Polygroup, the results are equivalent to first converting the selection to corresponding EGeometryTopologyType::Triangle selection and then finding the boundary vertices. This gives the intuitive result for face selections, but may or may not be what is desired for polygroup vertex/edge selections, because vertices/edges that seem to be on the interior of the polygroup selection may be considered border vertices if the tesselation is such that they are adjacent to unselected triangle vertices/edges.

namespace UE  
{  
    namespace Geometry  
    {  
        bool UE::Geometry::GetSelectionBoundaryVertices  
        (  
            const UE::Geometry::FDynamicMesh3 & Mesh,  
            const UE::Geometry::FGroupTopology * GroupTopology,  
            const UE::Geometry::FGeometrySelection & ReferenceSelection,  
            TSet< int32 > & BorderVidsOut,  
            TSet< int32 > & CurVerticesOut  
        )  
    }  
}  
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namespace UE {     namespace Geometry     {         bool UE::Geometry::GetSelectionBoundaryVertices         (             const UE::Geometry::FDynamicMesh3 & Mesh,             const UE::Geometry::FGroupTopology * GroupTopology,             const UE::Geometry::FGeometrySelection & ReferenceSelection,             TSet< int32 > & BorderVidsOut,             TSet< int32 > & CurVerticesOut         )     } }

true if successful. For instance, could fail if GroupTopology was null for a EGeometryTopologyType::Polygroup selection

Parameters