Per-player speed / jump / gravity overrides

[MirceaKitsune]

Since I coded the new player physics, people frequently asked if something could be done to create low gravity areas and allow per-player weights. RealBadAngel also said he's like to do a jump boots powerup for one of his ideas, and I don't think running boots would be a bad idea either (or slow nodes like MineCraft's "soul sand").

So here's a patch which allows doing all that. It implements a new Lua function that can modify walking speed, jump height and gravity for individual players. To test it, use this function in a Lua script: player:set_physics_override(float_speed, float_jump, float_gravity). By default all values are 1... 0.5 means half of the normal amount while 2 means double the normal amount. They basically multiply the global physics settings in minetest.conf for individual players as optional overrides. I found this the cleanest and safest implementation so I hope no major changes are needed.

[ShadowNinja]

I think you should be able to set the three overrides individually.
That way you would be able to, for example, use running boots and also have a jump boost.

[MirceaKitsune]

ShadowNinja: I thought about that. But adding a function for each setting would make a mess in the code and add unnecessary complexity. Best to keep one function for the physics override as a whole. Especially since if I'm correct, you can modify individual values if you need to.

eg: Instead of using (1, 1, 0.5) to modify gravity (erasing speed and jump changes other mods could have made) you can use ( , , 0.5) which only modifies the third value. Hope I'm not wrong here, but pretty sure Lua works that way when the ~nil check is in place.

[ShadowNinja]

Good, I thought then you had to set them all.

[Uberi]

If you ask me, there should also be a function that gets the movement physics values, even if only for consistency.

[PilzAdam]

c5a8448

[ghost]

...maybe now someone can resurrect a new potion mod