Edges are a material decision.

A source-backed wireframe contract: compare native MeshBasicMaterial.wireframe against a barycentric edge shader with a controllable thickness uniform and alpha-to-coverage enabled on an antialiased WebGLRenderer.

This route claims the installed WebGLRenderer, MeshBasicMaterial wireframe path, barycentric edge attribute/shader path, thickness uniform, alphaToCoverage, side policy, OrbitControls, resize, sampling, reset, and teardown only. The official Walt Head asset, exact shader/pixel output, GUI presentation, device/compiler/backend matrix, and whole-example fidelity remain separate.

Sources: official wireframe materials example · Material · WebGLRenderer