VertexLists
A list of indices for each vertex, in two flat arrays.
In the namespace mesh::process. Declared in src/libs/libmesh/mesh/process/FeatureDetection.hpp.
Detailed description
FeatureAnalysis::vertexFaces and vertexNeighbors were a QVector per vertex, and their appends made several allocations for each of tens of thousands of vertices, 12 times a remesh (construct-mesh-quality §IM-12). build() takes (vertex, index) pairs in the order the appends came and keeps that order within each vertex's list.