Easy "work of art" coastlines

[makanyane]

if you use 0,0,0 as 'land' value on an odd/odd square ie. the ones that control the land/sea difference then you get the alternating land/sea flashing effect on campaign map... and also probably add the possibility of boats being 'grounded' in those areas, I think that was a known bug....

you can use 0,0,0 to smooth coastlines if it's not on the odd/odd squares at which points it acts a bit like having a deep sea colour at that point - however if you do that you can be stuck with unadjustable triangles produced from high land behind as you then have no way of adjusting the transition with the actual land pixels behind the 0,0,0 pixel (I think it also did some undesirable stuff to the battlemaps) so 0,0,0 is generally best avoided.

there was some confusion in earlier games as the vanilla RTW maps used 0,0,0 for some coastal regions but that only worked if the map_heights.tga was converted to map_heights.hgt - removing the map_heights.hgt showed up the same problems as you get with using it in M2