Vertexix

Merge Selection & Pass Through

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Two actions appear once at least one material is toggled on in the list, each disabled with nothing selected.

The Merge Selection and Pass Through buttons below the material list, with the Merge Selection name popup and its Merge Points distance-unit picker open
Merge Selection and Pass Through, with the group-naming popup and its Merge Points options open.

Merge Selection

Groups every currently-toggled material under one name you choose in a popup. A material belongs to at most one group; once grouped, it drops out of the plain materials list and is reachable only through its group row (see Merged Groups Management) until deleted or edited back out. Groups are session-only, reset on mesh load.

The same popup offers Merge Points: welds the group's own vertex points together, letting separately authored parts (a torso and an arm exported as disconnected pieces, say) become one continuous surface for retopology. Automatic merges points sharing exact coordinates; Fixed Distance merges any points within a chosen distance, with a unit picker (µm/mm/cm/m).

A high-poly source material passed straight through into the created topology, its original dense geometry untouched beside the retopologized rest of the mesh
A toggled material passed straight through: its original geometry sits unchanged in the created topology, beside the retopologized rest of the mesh.

Pass Through

Copies the currently-toggled material or group straight into the created topology unchanged, skipping retopology for it entirely. UV charts and bakes already completed on other, already-handled materials are preserved — Pass Through only touches the materials you toggled.