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Does anyone see a way of adding these techs without new icons?
There are images of statues of most of these deities that could be taken as a template.
Remembering some commits and looking at the incomplete 2D Art part of the credits section,
we can see @Pureon , @wowgetoffyourcellphone and @Lion.Kanzen made some icons.
Maybe ask Lion if he has the qualification, time and interest to do so.
I wonder too when I see all the old random maps. Many have no terrain height differences to speak of and look extremely ugly to me. For example the all-time-lobby-favorite map Mainland (here with trees removed):
This has become much better in the last years. For example wraitii's Pyrennean Sierra map from 2012 has a nice mountain range and slowly increasing height. _kalis maps from alpha 20 / 2015 introduced the gameplay-wise really interesting bluffs (most prominent map Ambush). With Alpha 21 / 2016 _kali had added real-world maps (most probably excluding curvature) Red Sea, Mediterranean and so forth that look much better. In early 2017, when Hannibal_Barca wanted to give us more flat earth maps, we had identified the recipe for beautiful maps: The createBumps call, which should be more often used for these ugly maps.
Like mario galaxy?
0 A.D. maps are not large enough to reveal any curvature of the theoretical dimensions, because largest map size * TERRAIN_TILE_SIZE = 512 * 4 = 2048 meters if I'm not mistaken.
(Other than the 0 A.D. part, it's an interesting topic but as offtopic as it might get.)