Line was generated for meshes with duplicate verts, to prevent loss
of vertices. But this was a problem because some duplicate verts
need removing. (E.g. some duplicate verts are generated for UV
mapping. These should be removed during import.) This does mean the
g3d script can lose information on import.
* Use hashset for more efficient vert comparison. (Suggested by Titi.)
* Create line of verts for basis mesh, for rare cases where there's no
mesh frame where all the verts are different.
* Fix bug in animation where all animation frames shifted by 1 (and last
frame was not included in the animation).
Script use to always use the first frame as the "basis" mesh.
But this caused problems because sometimes the first mesh had a
size 0 i.e. all the verts are the same. This is fixed by adding
a step to search for a frame with the largest number of verts in
different positions. This frame is then used as the basis mesh.
Errors could still happen if the mesh doesn't have any frames
without overlapping verts.
doublesided switch in blender 2.9x did not work before, it was always
rendered single sided in MG.
I added a new switch only-selectable which allows to create unvisible
but selectable meshes. This helps with selection of small units which
can now have an unvisible hand craftet select object around them for
example..
Meshes were missing a "double sided" property. So they importing/
exporting "double sided" meshes failed.
Converting meshes from quads to triangles was failing, when a mesh was
selected, because not all of the vertices were selected in "edit" mode.
Script now selects all verts are selected when switched to edit mode.
* Blender 2.90 import mostly working
* g3d b290 script: Finish support for importing g3d
* G3D B290: exporter now works
Blender exporter now working. There's still a lot to fix in the script but the basic setup works.
* G3D B290: script now exports animations
