MRMeshSubdivideCallbacks.h

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#pragma once
 
#include "MRMesh.h"
#include "MRMeshAttributesToUpdate.h"
 
namespace MR
{
// callback that is called each time edge (e) is split into (e1->e), but before the ring is made Delone
// (i.e. in subdivideMesh) and changes moved vertex attribute to correct value.
// Useful to update vertices based attributes like uv coordinates or verts colormaps
template <typename T>
auto onEdgeSplitVertAttribute( const Mesh& mesh, Vector<T, VertId>& data );
 
// callback that is called each time edge (e) is split into (e1->e), but before the ring is made Delone
// (i.e. in subdivideMesh) and changes moved vertex attribute to correct value.
// Useful to update face based attributes like texturePerFace or face colors
template <typename T>
auto onEdgeSplitFaceAttribute( const Mesh& mesh, Vector<T, FaceId>& data );
 
MRMESH_API OnEdgeSplit meshOnEdgeSplitAttribute( const Mesh& mesh, const MeshAttributesToUpdate& params );
 
MRMESH_API OnEdgeSplit meshOnEdgeSplitVertAttribute( const Mesh& mesh, const MeshAttributesToUpdate& params );
 
MRMESH_API OnEdgeSplit meshOnEdgeSplitFaceAttribute( const Mesh& mesh, const MeshAttributesToUpdate& params );
 
template <typename T>
auto onEdgeSplitVertAttribute( const Mesh& mesh, Vector<T, VertId>& data )
{
    auto onEdgeSplit = [&] ( EdgeId e1, EdgeId e )
    {
        const auto org = mesh.topology.org( e1 );
        const auto dest = mesh.topology.dest( e );
        if ( org < data.size() && dest < data.size() )
            data.push_back( data[org] * 0.5f + data[dest] * 0.5f ); // important to multiply each of ends individually not to lose data for clamped integer values (like colors)
    };
 
    return onEdgeSplit;
}
 
template <typename T>
auto onEdgeSplitFaceAttribute( const Mesh& mesh, Vector<T, FaceId>& data )
{
    auto onEdgeSplit = [&] ( EdgeId e1, EdgeId e )
    {
        // getting a left face for an edge that has been split.
        auto oldLeft = mesh.topology.left( e );
        // getting a left face for a new edge that was added during splitting.
        auto newLeft = mesh.topology.left( e1 );
 
        if ( newLeft && oldLeft && oldLeft < data.size() )
            data.autoResizeSet( newLeft, data[oldLeft] );
 
        // getting a right face for an edge that has been split.
        auto oldRight = mesh.topology.right( e );
        // getting a right face for a new edge that was added during splitting.
        auto newRight = mesh.topology.right( e1 );
 
        if ( newRight && oldRight && oldRight < data.size() )
            data.autoResizeSet( newRight, data[oldRight] );
    };
 
    return onEdgeSplit;
}
 
}