Time  Nick            Message
01:29 fluxionary      today, i discovered lua coroutines. i love them in python, but i'm unsure about whether i want to use coroutines in mods. i've never seen them in mod code i've contributed to (noting that a search shows they're in techage, techpack, lwcomputers, and modlib).
01:30 fluxionary      they *absolutely* make an iterator i'm working on much saner though, if you understand what you're looking at.
01:36 fluxionary      the application is an attempt to make `minetest.get_objects_in_area` faster
02:10 muurkha         in Lua (and Squirrel) they're more flexible than Python generators; they have stacks
03:05 fluxionary      i agree, they're more powerful than python generators, but python also has equivalent coroutines
03:06 fluxionary      (coroutines equivalent to what lua has)
04:20 muurkha         well, Python has threads, which you can make equivalent to Lua coroutines by adding a single lock to your program so they can't ever preempt each other
04:21 muurkha         but possibly you are incorrectly thinking async and await in Python is equivalent to Lua coroutines; they aren't and you can't simulate Lua coroutines with them
04:21 muurkha         and Python threads are OS threads, so they're orders of magnitude less efficient than Lua coroutines
04:22 lissobone       Hi.
04:24 lissobone       I've finished the checkpoint mod, but I want to know your opinion: when I use the ret pad and teleport back, the velocity with which the player was moving prior teleportation remains.  Would it be wiser to limit the freedom of movement and set player velocity to (0, 0, 0)?
04:25 lissobone       Basically, if you were falling and teleported back, you might take fall damage.
04:25 lissobone       Leaving this opens up some room for tricks and hacks.
04:33 lissobone       I'll just add 2 types of checkpoints: one that keeps velocity and one that doesn't.
04:38 Blockhead256[m] lissobone: it's probably for the best to set an exact point and 0 velocity (or pre-defined, if you must, though with lag that might be bad) to restore the player to.  Otherwise the player risks getting stuck in a loop.
04:44 lissobone       Hmm, alright.
04:45 lissobone       I limited the pad use range to 2.7 so the player would have to stand pretty close to it, thus reducing the chance of randomly falling anywhere.
05:44 lissobone       Players, unfortunately, do not support set_velocity, but I hacked my way to winage and remembered how I studied math at school: x - (x + x) equals -x, and adding -x to x (negative velocity plus regular velocity) yields 0 ({x = 0, y = 0, z = 0}).
05:47 lissobone       Here's how to make use of it:  'local vel = player:get_velocity() player:add_velocity(vector.subtract(vel, vector.add(vel, vel)))'
06:49 whosit          lissobone: that is equivalent to: vector.add(vel, vector.multiply(vel, -1))
06:50 lissobone       Well, that's also true.  I had the multiply way in mind, but instead I wanted to subtract the double of the vector from itself.
06:52 whosit          just saying :)
06:53 lissobone       And your way yields a null vector, I believe: vel + -vel = 0.
06:54 whosit          hm?
06:54 whosit          that wasn't the point? to zero out the speed?
06:56 lissobone       Players don't support set_velocity, only add_velocity.
06:57 whosit          you mean player:add_velocity(vector.multiply(player:get_velocity(), -1)) ?
06:58 lissobone       Yes, that.  But the documentation page said something about deprecation, maybe I read it wrongly (?).
07:02 whosit          I found only this: https://github.com/minetest/minetest/blob/1b95998d11fb0d51fbfeedc56de4ca2191ad3f7a/doc/lua_api.txt#L7261
07:06 whosit          was just saying you can do same thing with less steps, which does not matter in this case, except may be less confusing (at least to me)
09:09 lissobone       I have released the checkpoint mod, but -- oops! -- forgot to add the license notice.
09:15 MTDiscord       <luatic> fluxionary: making iterators more convenient is a typical use case of coroutines, go right ahead :)
09:15 MTDiscord       <luatic> in fact the usage of coroutines in modlib is due to iterator utils
09:22 lissobone       Final question.
09:24 lissobone       When a player punches the checkpoint, it blinks with green for approximately 1/√2 (0.717) seconds, then turns red again.  Would it be appropriate to set the checkpoint position metadata only after the green period?  This opens up room for some cool tricks.
09:24 lissobone       Why am I even asking?
09:28 lissobone       I only wonder how to change anything in the inventory inside a minetest.after() clause.
09:29 sfan5           @luatic the patch you provided for spiraling-down seems to incomplete, I don't see a single call to register_mapgen_dofile
09:29 sfan5           +be
09:30 MTDiscord       <luatic> let me check
09:32 sfan5           even better when you have the changes just push them to a branch
09:32 MTDiscord       <luatic> ah yeah, I had an uncommitted file that didn't make it into the diff
10:01 MTDiscord       <luatic> sfan5: here you go: https://github.com/spiraling-down/game/tree/mapgen-threads (got sidetracked while compiling https://xkcd.com/303/)
10:01 MTDiscord       <luatic> thank you very much for your work, it makes SD almost playable now that the main thread isn't constantly blocked :)
10:06 lissobone       Almost playable?
10:09 sfan5           fyi you can import files even from the mapgen env, so the sd_map:stuff hack might not be necessary
10:11 MTDiscord       <luatic> lissobone: there's still quite some optimization to be done even if mapgen doesn't block the main thread anymore
12:05 sfan5           @luatic I can't reproduce the error messages you meant
12:06 sfan5           plus: I spawned inside a node, this text is overlapping: https://0x0.st/HT1p.png, the window with the story didn't disappear automatically
12:06 sfan5           and the music is quite loud
12:08 sfan5           and there's z-fighting on sd_map:deco_pebbles_basalt_1
12:09 sfan5           respawning drops me far in the sky
12:09 sfan5           also z-fighting on snow somehow
12:10 sfan5           plus it's hard to keep track of the information I get dumped on me in the beginning
12:10 sfan5           at least a "show item name when hotbar selection changes" thing would be nice
15:20 MTDiscord       <luatic> sfan5: It currently doesn't error for me either. This was a while ago, you've probably fixed the underlying cause since then.
15:20 sfan5           I don't think I have but 🤷
18:33 Wuzzy           do i have access to moveresult to players, too?
18:33 Wuzzy           because I want to look at touching_ground (which tells me if an entity is touching the ground)
18:34 sfan5           nope
18:34 Wuzzy           Someone reported a strange bug for my game. Apparently the player Y velocity isn't reliably 0 anymore when the FPS is high, like 165. https://codeberg.org/Wuzzy/Glitch/pulls/35
18:35 Wuzzy           i suppose looking at the player Y velocity to check if im touching the ground isnt a great idea, right? :D
18:36 sfan5           that's an engine bug, probably
18:37 sfan5           similar to this https://github.com/minetest/minetest/issues/10962
18:40 Krock           the movement is really jerky with 800 FPS according to my tests
18:41 Wuzzy           any tips on how to check "this player is standing on the ground?"
18:42 Krock           pos.Y - 0.1
18:43 Wuzzy           not precise for me. if the player moves vertically, thats not "standing". seems like i kinda am forced to test vertical vel but it goes weird at high FPS
18:46 Krock           when they're moving vertically they have no solid ground under their feet position, neither if the speed is positive
18:47 Krock           it could be that the collision detection does not exactly set the player at the node's surface, resulting in slightly nonzero downwards velocities. these however should still be <0.1 in absolute value
18:50 Wuzzy           funny you say this because 0.1 is exactly the value suggested to me by the PR author :D
18:51 Wuzzy           it still feels off the vel Y value wiggles around 0 instead of staying exactly 0.
18:52 Wuzzy           but yeah the issue in my game seems to be i set the current threshold to 0.001 instead of 0.1 so maybe it was just too low.
19:13 zuffnick        wo gibts die besten mods?
19:13 Krock           bei Marcel D'Avis von 1&1
19:13 zuffnick        :)
19:14 zuffnick        oder bei obi?
19:14 Krock           #minetest-de ist übrigend wür deutschsprachige Diskussionen. hier nur auf English.
20:25 uyku            Desour: sup
20:25 Desour          hi
20:26 uyku            Desour: send another msg, am testing something
20:26 Desour          ok
20:26 uyku            Yass, it works
20:27 uyku            Are you playing today?
20:27 Desour          maybe
20:52 MinetestBot     02[git] 04numberZero -> 03minetest/minetest: Cull liquid back face on liquid-glasslike interface (#13594) 13f1feeb3 https://github.com/minetest/minetest/commit/f1feeb319c0a64ee18fb8b29571d5540c084e12c (152023-06-18T20:52:14Z)
23:22 Guest20         is there an sdl2 build of minetest for windows? many mouse issues in the non-sdl2 version of it
23:22 Guest20         seemed like sdl2 might fix it but i can't find builds
23:25 Desour          Guest20: yes
23:25 Desour          build with -DUSE_SDL2=1
23:25 Guest20         no i mean ready builds
23:25 Guest20         i tried to do it myself but idk how to use all this stuff
23:26 Desour          no
23:26 Guest20         will it switch to sdl2 in the next release at least?
23:27 Desour          possibly
23:27 Guest20         heres hoping then
23:27 Guest20         thanks for the helpe
23:27 Guest20         *help
23:27 Desour          !next
23:27 MinetestBot     Another satisfied customer. Next!