I currently can't sphere/cylinder map this type of chart/cuts

[ggaliens]

OK ... it is fixed now. But I get to use my triangles ... and I was correct to use a nice foamy triangle mesh. There are reasons why it is better to have aribitrary than to have quad dominant arrangement following lat and long lines. I fixed the seam UVs.

---

Code:

command({vertex,{manifoldlab,spherical_y}}, #st{sel=[{WeID,Set}]}=St) ->
    wings_io:hourglass(),
    #we{} = We = gb_trees:get(WeID, St#st.shapes),
    [{_,MinY,_}=_Min,_Max] = wings_vertex:bounding_box(We),
    {_,Dy,_} = e3d_vec:sub(_Max,_Min),
    TWOPI = 2.0*math:pi(),
    timer_start(make_uvs),
    MyAcc = fun(Fi,Acc) ->
        Vs = wings_face:vertices_cw(Fi,We),
        MyInner = fun(Vi, _Acc) ->
            {X,Y,Z} = wings_vertex:pos(Vi,We),
            U = (math:atan2(X,Z) + math:pi())/TWOPI, % range 0 - 1.0b
            Temp = max(min(Y/(0.5*Dy),1.0),-1.0),
            V =  (math:asin(Temp) + math:pi()/2.0)/math:pi(),
            [{U,V,Vi}|_Acc]
        end,
        UVs = lists:foldl(MyInner,[],Vs),
        [{Fi,lists:sort(UVs)}|Acc]
    end,
    List = gb_sets:fold(MyAcc, [], wings_vertex:covered_faces(Set,We)),
    timer_stop(make_uvs),
    timer_report(make_uvs),
    timer_start(apply_uvs),
    MyApply = fun({Fi, UVs0}, Acc) ->
        UVs =
        case UVs0 of
            [{U1,V1,Vi1},{U2,V2,Vi2},{U3,V3,Vi3}]
                when (U1 =< 0.25 andalso  0.75 =< U2) ->
                %erlang:display("Fix U1 !"),
                [{U1+1.0,V1,Vi1},{U2,V2,Vi2},{U3,V3,Vi3}];
            [{U1,V1,Vi1},{U2,V2,Vi2},{U3,V3,Vi3}]
                when (U1 =< 0.25 andalso  0.75 =< U3) ->
                %erlang:display("Fix U1,U2!"),
                [{U1+1.0,V1,Vi1},{U2+1.0,V2,Vi2},{U3,V3,Vi3}];
            _ -> UVs0
        end,
        MyApply2 = fun({U,V,Vi}, _Acc) ->
            wings_va:set_vtx_face_uvs(Vi, [Fi], {U,V}, _Acc)
        end,
        lists:foldl(MyApply2, Acc, UVs)
    end,
    We2 = lists:foldl(MyApply, We, List),
    timer_stop(apply_uvs),
    timer_report(apply_uvs),
    wings_shape:replace(WeID,We2,St);