Here are some tips for Mdlvis:
- to split geosets, you have a dedicated button named "detach as new geoset" (looks like a green ball). Just select some vertices of a geoset and click on it.
- to move vertices from one geoset to another, just copy/paste. Strangely Mdlvis will paste with a Z offset of 5, so you will have to move copied vertices by 5 after pasting (select "move" tool and add or substract 5 manually to the Z coordinate). Then delete vertices from the original geoset. As far as i know it's not possible to delete a whole geoset in Mdlvis so i use Magos for that.
- to assign materials to geosets, i use Magos.
- to rewrap in Mdlvis, just select the vertices and move them in the UVmap editor. If you need to redo it completely, you can use projection: select vertices and align the camera to match your texture, then go to UVmap, select vertices and click "project". Mirror tools can also be useful.
- texture seams in Warcraft 3 are made by duplicate vertices. In Mdlvis, to know if there is a seam on a specific vertex, select it with a selection box: if the "weld" button is active, then you have a seam (clicking weld would remove this seam). To select easily only one side of the seam, click on the faces instead of the vertices.