5.4 Retopo Menu & Tool Bar

From 3D-Coat Wiki

Of course any good tool probably has more to it then meets the eye. The retopology tools are no exception to this rule. You can find the menu in the top tool bar, under “Retopo”. Below are listed all of the functions in this menu.

Import. You can import external mesh there to continue retopologization started in other 3D-modeler.

Export. you can export retopo mesh to continue work in other 3D-modeling tool.
Export selected. Export only selected faces. Use current low-poly mesh. Reference mesh can be imported to retopologize big objects made in other 3D modeling tools. They can contain reference to textures. In this case objects will be colored; color will be used in baking and merging into scene.
Unwrap. The same as Unwrap in Mark seams mode.
Clear mesh. Clear the whole mesh.
Subdivide. Subdivide the whole mesh.
Relax. Relax the whole retopo mesh.
Apply symmetry. Apply symmetrical mirroring.
Bake Texture. Bake texture onto patch. This operation requires a UV-set.
Merge selected only.
Use selected faces only for all merge/bake operations.
Merge into scene (microverts). This command allows you to merge retopologized mesh into scene. All details from reference mesh will be baked to a new object. Additional extrusion can also be applied. UV-set is required, but if you have not assigned UV-set it will be generated automatically.
Merge hull (microverts). Merge outer hull over reference object into scene. This function works like Merge into scene but optimized for multi-objected reference mesh. It prefers outer points while baking surface.
Merge patch (microverts). Merge raw patch into scene. No baking will be performed. This command can be used to merge new object without projecting details from the reference mesh.
Merge into scene (per-pixel). The same as for microverts. The only difference is that merging will be performed into Per-Pixel painting room.
Merge for per-pixel painting with normalmap. Normal map will be baked to a separate layer. Displacement won't be baked.
Merge patch (per-pixel). Merge patch into scene for per-pixel painting
Save retopology state. Store retopology state to a separate file.
Restore retopology state. Restore retopology state from a separate file.

Lastly of course we have a small handful of functions that reside in the top tool bar for the Retopo tab:

Z-bias. Adjust the z-bias to get a better look at the retopologized mesh preview.

Additional extrusion. You can extrude the retopologized mesh. This is a great way to make clothing for your characters.