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Add player knockback on punch to builtin
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@ -33,5 +33,6 @@ dofile(gamepath .. "features.lua")
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dofile(gamepath .. "voxelarea.lua")
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dofile(gamepath .. "forceloading.lua")
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dofile(gamepath .. "statbars.lua")
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dofile(gamepath .. "knockback.lua")
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profiler = nil
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46
builtin/game/knockback.lua
Normal file
46
builtin/game/knockback.lua
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@ -0,0 +1,46 @@
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-- can be overriden by mods
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function core.calculate_knockback(player, hitter, time_from_last_punch, tool_capabilities, dir, distance, damage)
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if damage == 0 or player:get_armor_groups().immortal then
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return 0.0
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end
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local m = 8
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-- solve m - m*e^(k*4) = 4 for k
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local k = -0.17328
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local res = m - m * math.exp(k * damage)
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if distance < 2.0 then
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res = res * 1.1 -- more knockback when closer
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elseif distance > 4.0 then
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res = res * 0.9 -- less when far away
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end
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return res
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end
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local function vector_absmax(v)
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local max, abs = math.max, math.abs
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return max(max(abs(v.x), abs(v.y)), abs(v.z))
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end
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core.register_on_punchplayer(function(player, hitter, time_from_last_punch, tool_capabilities, unused_dir, damage)
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if player:get_hp() == 0 then
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return -- RIP
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end
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-- Server::handleCommand_Interact() adds eye offset to one but not the other
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-- so the direction is slightly off, calculate it ourselves
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local dir = vector.subtract(player:get_pos(), hitter:get_pos())
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local d = vector.length(dir)
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if d ~= 0.0 then
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dir = vector.divide(dir, d)
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end
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local k = core.calculate_knockback(player, hitter, time_from_last_punch, tool_capabilities, dir, d, damage)
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local kdir = vector.multiply(dir, k)
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if vector_absmax(kdir) < 1.0 then
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return -- barely noticeable, so don't even send
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end
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player:add_player_velocity(kdir)
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end)
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@ -5019,6 +5019,15 @@ Misc.
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of the creative mode setting, checks for "sneak" to set the `invert_wall`
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parameter and `prevent_after_place` set to `true`.
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* `minetest.calculate_knockback(player, hitter, time_from_last_punch,
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tool_capabilities, dir, distance, damage)`
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* Returns the amount of knockback applied on the punched player.
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* Arguments are equivalent to `register_on_punchplayer`, except the following:
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* `distance`: distance between puncher and punched player
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* This function can be overriden by mods that wish to modify this behaviour.
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* You may want to cache and call the old function to allow multiple mods to
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change knockback behaviour.
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* `minetest.forceload_block(pos[, transient])`
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* forceloads the position `pos`.
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* returns `true` if area could be forceloaded
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