As a creator of hex maps, I have tried to make the triangle grids work for lining up hexes, but the snapping ability of the triangles to line up hexes is clumsy and I must manually eyeball lining up the next vertical column of hexes to nest against the other columns of hexes. I have been able to re-import previously created hex grids that I spent hours lining up perfectly, then locking that group. But it would be fantastically useful if hexes could be an option in the grid and axis manager tool of Affinity Designer.
