About the normals

[yangyang117]

Hi, I want to know how to fix the normal or FlipNormals for a polydata.(pseudonormal?)

and I also want to kown how to get all the point id for one edge of the hole edges.(to show all the edge in different color and people can choose which one to fix)
// Find single edge for each hole in mesh
std::vectorMR::EdgeId holeEdges = mesh.topology.findHoleRepresentiveEdges();

[Grantim]

Hello!

I want to know how to fix the normal or FlipNormals for a polydata

One can flip all normals in mesh with mesh.topology.flipOrientation()

MeshLib/source/MRMesh/MRMeshTopology.h

Lines 404 to 408 in a4b1bf3

	/// flip orientation (normals) of
	/// * all mesh elements if \param fullComponents is nullptr, or
	/// * given mesh components in \param fullComponents.
	/// The behavior is undefined if fullComponents is given but there are connected components with some edges included and not-included there.
	MRMESH_API void flipOrientation( const UndirectedEdgeBitSet * fullComponents = nullptr );

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I also want to kown how to get all the point id for one edge of the hole edges

Please have a look at this file https://github.com/MeshInspector/MeshLib/blob/master/source/MRMesh/MRRegionBoundary.h it contains functions to find/track holes' edges.
To find edge points you can use mesh.topology.org( edgeId ) mesh.topology.dest( edgeId )

MeshLib/source/MRMesh/MRMeshTopology.h

Lines 76 to 80 in a4b1bf3

	/// returns origin vertex of half-edge
	[[nodiscard]] VertId org( EdgeId he ) const { assert(he.valid()); return edges_[he].org; }
	/// returns destination vertex of half-edge
	[[nodiscard]] VertId dest( EdgeId he ) const { assert(he.valid()); return edges_[he.sym()].org; }

Also, #1377 reading this issue may be useful