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IRC log for #minetest-dev, 2020-01-07

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All times shown according to UTC.

Time Nick Message
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17:04 Wuzzy #9205
17:04 ShadowBot https://github.com/minetest/minetest/issues/9205 -- Falling nodes: Add support for facedir, colorfacedirr, wallmounted, colorwallmounted, color, airlike, signlike, torchlike and glow by Wuzzy2
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19:46 Krock paramat?
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20:32 Krock > Paramat wants to remove it. SmallJoker wants to keep it, but improve it a little. Now what?
20:33 Krock Wuzzy: moving the documentation from lua_api.txt to menu_lua_api.txt would be compatible with both requests
20:33 Krock although it's not where game writers would look for such information
20:33 Wuzzy ah, good point
20:33 Krock because I assume it's planned to make it per-game
20:33 Wuzzy well, its not for game writers anyway at this point
20:34 Krock right
20:34 Wuzzy obviously thi can be changed as soon per-game music arrives
20:34 Krock the description would need to be adjusted anyway so it does not really matter
20:37 Wuzzy Krock: also, the atan2 thing for falling_fixes. your suggested code does not work anyway
20:38 Krock yes, I assumed the calculations aren't correct yet
20:38 Krock as written in the code, it's entirely untested (except the yaw calculation)
20:39 Wuzzy it seems yaw is broken too
20:39 Wuzzy anyway maybe its better to avoid atan2 altogether. im not sure about speed. paramat might be worried
20:39 Wuzzy falling_nodes are very critical
20:40 Wuzzy but maybe i'm being too paranoid here
20:41 Krock from the server perspective it makes a difference for sure, but in singleplayer mode it won't really matter due to the mapblock mesh generator and object creation that takes noticeably more time
20:42 Wuzzy do u know complexity of math.atan2 function, by any chance?
20:45 Krock no sorry. but the C implementation is likely a LUT + multi-polynomial interpolation
20:47 Krock (not sure if polynomial is the right term here, but it uses multiple data points)
20:48 Krock even more black magic than that according to https://stackoverflow.com/a/23048159
20:59 Wuzzy heh. "black magic" is the right word
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22:58 p_gimeno > Maybe a lookup-table-based approach is better. Using *_to_dir to get the dir, then use dir to lookup angles.
22:58 p_gimeno Why not using facedir to look up angles?
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