388 lines
8.8 KiB
Lua
388 lines
8.8 KiB
Lua
-- localize math functions
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local math = math
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local HALF_PI = math.pi / 2
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local DOUBLE_PI = math.pi * 2
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-- localize vector functions
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local vector = vector
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local minetest_yaw_to_dir = minetest.yaw_to_dir
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local minetest_dir_to_yaw = minetest.dir_to_yaw
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local DEFAULT_JUMP_HEIGHT = 5
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local DEFAULT_FLOAT_SPEED = 4
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local DEFAULT_CLIMB_SPEED = 3
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mobs.stick_in_cobweb = function(self)
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local current_velocity = self.object:get_velocity()
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local goal_velocity = vector.multiply(vector.normalize(current_velocity), 0.4)
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goal_velocity.y = -0.5
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local new_velocity_addition = vector.subtract(goal_velocity,current_velocity)
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--smooths out mobs a bit
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if vector.length(new_velocity_addition) >= 0.0001 then
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self.object:add_velocity(new_velocity_addition)
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end
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end
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--this is a generic float function
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mobs.float = function(self)
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local acceleration = self.object:get_acceleration()
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if acceleration and acceleration.y ~= 0 then
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self.object:set_acceleration(vector.new(0,0,0))
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else
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return
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end
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local current_velocity = self.object:get_velocity()
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local goal_velocity = {
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x = 0,
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y = DEFAULT_FLOAT_SPEED,
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z = 0,
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}
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local new_velocity_addition = vector.subtract(goal_velocity,current_velocity)
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new_velocity_addition.x = 0
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new_velocity_addition.z = 0
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--smooths out mobs a bit
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if vector.length(new_velocity_addition) >= 0.0001 then
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self.object:add_velocity(new_velocity_addition)
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end
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end
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--this is a generic climb function
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mobs.climb = function(self)
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local current_velocity = self.object:get_velocity()
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local goal_velocity = {
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x = 0,
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y = DEFAULT_CLIMB_SPEED,
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z = 0,
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}
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local new_velocity_addition = vector.subtract(goal_velocity,current_velocity)
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new_velocity_addition.x = 0
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new_velocity_addition.z = 0
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--smooths out mobs a bit
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if vector.length(new_velocity_addition) >= 0.0001 then
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self.object:add_velocity(new_velocity_addition)
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end
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end
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--[[
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_ _
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| | __ _ _ __ __| |
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| | / _` | '_ \ / _` |
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| |___| (_| | | | | (_| |
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\_____/\__,_|_| |_|\__,_|
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]]
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-- move mob in facing direction
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--this has been modified to be internal
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--internal = lua (self.yaw)
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--engine = c++ (self.object:get_yaw())
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mobs.set_velocity = function(self, v)
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local yaw = (self.yaw or 0)
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local current_velocity = self.object:get_velocity()
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local goal_velocity = {
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x = (math.sin(yaw) * -v),
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y = 0,
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z = (math.cos(yaw) * v),
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}
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local new_velocity_addition = vector.subtract(goal_velocity,current_velocity)
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if vector.length(new_velocity_addition) > vector.length(goal_velocity) then
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vector.multiply(new_velocity_addition, (vector.length(goal_velocity) / vector.length(new_velocity_addition)))
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end
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new_velocity_addition.y = 0
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--smooths out mobs a bit
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if vector.length(new_velocity_addition) >= 0.0001 then
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self.object:add_velocity(new_velocity_addition)
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end
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end
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-- calculate mob velocity
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mobs.get_velocity = function(self)
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local v = self.object:get_velocity()
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v.y = 0
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if v then
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return vector.length(v)
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end
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return 0
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end
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--make mobs jump
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mobs.jump = function(self, velocity)
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if self.object:get_velocity().y ~= 0 or not self.old_velocity or (self.old_velocity and self.old_velocity.y > 0) then
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return
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end
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--fallback velocity to allow modularity
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velocity = velocity or DEFAULT_JUMP_HEIGHT
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self.object:add_velocity(vector.new(0,velocity,0))
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end
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--make mobs fall slowly
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mobs.mob_fall_slow = function(self)
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local current_velocity = self.object:get_velocity()
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local goal_velocity = {
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x = 0,
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y = -2,
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z = 0,
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}
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local new_velocity_addition = vector.subtract(goal_velocity,current_velocity)
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new_velocity_addition.x = 0
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new_velocity_addition.z = 0
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if vector.length(new_velocity_addition) > vector.length(goal_velocity) then
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vector.multiply(new_velocity_addition, (vector.length(goal_velocity) / vector.length(new_velocity_addition)))
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end
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new_velocity_addition.x = 0
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new_velocity_addition.z = 0
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--smooths out mobs a bit
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if vector.length(new_velocity_addition) >= 0.0001 then
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self.object:add_velocity(new_velocity_addition)
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end
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end
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--[[
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_____ _
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/ ___| (_)
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\ `--.__ ___ _ __ ___
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`--. \ \ /\ / / | '_ ` _ \
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/\__/ /\ V V /| | | | | | |
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\____/ \_/\_/ |_|_| |_| |_|
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]]--
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--make mobs flop
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mobs.flop = function(self, velocity)
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if self.object:get_velocity().y ~= 0 or not self.old_velocity or (self.old_velocity and self.old_velocity.y > 0) then
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return false
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end
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mobs.set_velocity(self, 0)
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--fallback velocity to allow modularity
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velocity = velocity or DEFAULT_JUMP_HEIGHT
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--create a random direction (2d yaw)
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local dir = DOUBLE_PI * math.random()
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--create a random force value
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local force = math.random(0,3) + math.random()
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--convert the yaw to a direction vector then multiply it times the force
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local final_additional_force = vector.multiply(minetest_yaw_to_dir(dir), force)
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--place in the "flop" velocity to make the mob flop
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final_additional_force.y = velocity
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self.object:add_velocity(final_additional_force)
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return true
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end
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-- move mob in facing direction
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--this has been modified to be internal
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--internal = lua (self.yaw)
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--engine = c++ (self.object:get_yaw())
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mobs.set_swim_velocity = function(self, v)
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local yaw = (self.yaw or 0)
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local pitch = (self.pitch or 0)
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if v == 0 then
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pitch = 0
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end
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local current_velocity = self.object:get_velocity()
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local goal_velocity = {
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x = (math.sin(yaw) * -v),
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y = pitch,
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z = (math.cos(yaw) * v),
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}
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local new_velocity_addition = vector.subtract(goal_velocity,current_velocity)
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if vector.length(new_velocity_addition) > vector.length(goal_velocity) then
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vector.multiply(new_velocity_addition, (vector.length(goal_velocity) / vector.length(new_velocity_addition)))
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end
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--smooths out mobs a bit
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if vector.length(new_velocity_addition) >= 0.0001 then
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self.object:add_velocity(new_velocity_addition)
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end
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end
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--[[
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______ _
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| ___| |
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| |_ | |_ _
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| _| | | | | |
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| | | | |_| |
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\_| |_|\__, |
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__/ |
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|___/
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]]--
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-- move mob in facing direction
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--this has been modified to be internal
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--internal = lua (self.yaw)
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--engine = c++ (self.object:get_yaw())
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mobs.set_fly_velocity = function(self, v)
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local yaw = (self.yaw or 0)
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local pitch = (self.pitch or 0)
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if v == 0 then
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pitch = 0
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end
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local current_velocity = self.object:get_velocity()
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local goal_velocity = {
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x = (math.sin(yaw) * -v),
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y = pitch,
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z = (math.cos(yaw) * v),
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}
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local new_velocity_addition = vector.subtract(goal_velocity,current_velocity)
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if vector.length(new_velocity_addition) > vector.length(goal_velocity) then
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vector.multiply(new_velocity_addition, (vector.length(goal_velocity) / vector.length(new_velocity_addition)))
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end
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--smooths out mobs a bit
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if vector.length(new_velocity_addition) >= 0.0001 then
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self.object:add_velocity(new_velocity_addition)
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end
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end
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--a quick and simple pitch calculation between two vector positions
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mobs.calculate_pitch = function(pos1, pos2)
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if pos1 == nil or pos2 == nil then
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return false
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end
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return minetest_dir_to_yaw(vector.new(vector.distance(vector.new(pos1.x,0,pos1.z),vector.new(pos2.x,0,pos2.z)),0,pos1.y - pos2.y)) + HALF_PI
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end
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--make mobs fly up or down based on their y difference
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mobs.set_pitch_while_attacking = function(self)
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local pos1 = self.object:get_pos()
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local pos2 = self.attacking:get_pos()
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local pitch = mobs.calculate_pitch(pos2,pos1)
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self.pitch = pitch
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end
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--[[
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___
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| |_ _ _ __ ___ _ __
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| | | | | '_ ` _ \| '_ \
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/\__/ / |_| | | | | | | |_) |
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\____/ \__,_|_| |_| |_| .__/
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]]--
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--special mob jump movement
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mobs.jump_move = function(self, velocity)
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if self.object:get_velocity().y ~= 0 or not self.old_velocity or (self.old_velocity and self.old_velocity.y > 0) then
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return
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end
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--make the mob stick for a split second
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mobs.set_velocity(self,0)
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--fallback velocity to allow modularity
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local jump_height = DEFAULT_JUMP_HEIGHT
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local yaw = (self.yaw or 0)
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local current_velocity = self.object:get_velocity()
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local goal_velocity = {
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x = (math.sin(yaw) * -velocity),
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y = jump_height,
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z = (math.cos(yaw) * velocity),
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}
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local new_velocity_addition = vector.subtract(goal_velocity,current_velocity)
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if vector.length(new_velocity_addition) > vector.length(goal_velocity) then
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vector.multiply(new_velocity_addition, (vector.length(goal_velocity) / vector.length(new_velocity_addition)))
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end
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--smooths out mobs a bit
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if vector.length(new_velocity_addition) >= 0.0001 then
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self.object:add_velocity(new_velocity_addition)
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end
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end
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--make it so mobs do not glitch out and freak out
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--when moving around over nodes
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mobs.swap_auto_step_height_adjust = function(self)
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local y_vel = self.object:get_velocity().y
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if y_vel == 0 and self.stepheight ~= self.stepheight_backup then
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self.stepheight = self.stepheight_backup
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elseif y_vel ~= 0 and self.stepheight ~= 0 then
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self.stepheight = 0
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end
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end
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