how I can automatically detect thin wall

[JihoKang24]

Hi devs

I would like to know how I can automatically detect the red areas in the photo.
If you want it to sound a bit more casual or natural in spoken English, you could also say:
I’d appreciate it if you could tell me how to automatically detect the red areas in the photo.

I tried like this

        for (int i = 0; i < vertScalar->size(); i++)
        {
                VertId v = (VertId)i;
                
                if (mesh.topology.isBdVertex(v))
	                continue;
                
                double dThinValue = vertScalar->data()[i];
                if (dThinValue < 0.02) // how to determine this 0.02 automatically 
                {
	                vsThinVerts.set(v, true);
	                vtrThinVertices.push_back(VxConverVector3fToVxDouble3(mesh.points[v]));
                }
        }

I truly appreciate your continued support

[Grantim]

Hello!

In MeshHealer we use this function to calculate thickness of each vertex:

MeshLib/source/MRMesh/MRMeshThickness.h

Lines 11 to 13 in 2ad764e

	/// returns the distance from each vertex along minus normal to the nearest mesh intersection (or FLT_MAX if no intersection found)
	[[nodiscard]] MRMESH_API std::optional<VertScalars> computeRayThicknessAtVertices( const Mesh& mesh, const ProgressCallback & progress = {} );
	[[deprecated]] MRMESH_API VertScalars computeThicknessAtVertices( const Mesh& mesh );

As for critical value - we use 0.95*tolerance by default, but it should really depend on your needs, we just peaked some value based on user input tolerance

auto thicknessPerVert = computeRayThicknessAtVertices( mesh );
float critThickness = tolerance * 0.95f;
VertBitSet thinVerts( mesh.topology.getValidVerts().size() );
for ( auto v : mesh.topology.getValidVerts() )
    if ( thicknessPerVert[v] <= critThickness )
        thinVerts.set( v );

FaceBitSet thinFaces = getIncidentFaces( mesh.topology, thinVerts );

[JihoKang24]

I got it ! thanks for your helps