From 0794bc54372c6aaa9c653693da3a18194adf5c95 Mon Sep 17 00:00:00 2001 From: jordan4ibanez Date: Sat, 17 Apr 2021 13:04:55 -0400 Subject: [PATCH] Make flying mobs float in water and lava --- .../mcl_mobs/api/mob_functions/ai.lua | 133 +++++++++++++++++- .../mcl_mobs/api/mob_functions/movement.lua | 70 +++++++++ 2 files changed, 199 insertions(+), 4 deletions(-) diff --git a/mods/ENTITIES/mcl_mobs/api/mob_functions/ai.lua b/mods/ENTITIES/mcl_mobs/api/mob_functions/ai.lua index e558716fe..2cbde7324 100644 --- a/mods/ENTITIES/mcl_mobs/api/mob_functions/ai.lua +++ b/mods/ENTITIES/mcl_mobs/api/mob_functions/ai.lua @@ -29,7 +29,7 @@ end | | / _` | '_ \ / _` | | |___| (_| | | | | (_| | \_____/\__,_|_| |_|\__,_| -]] +]]-- --this is basically reverse jump_check local cliff_check = function(self,dtime) @@ -290,13 +290,137 @@ local swim_state_execution = function(self,dtime) else --do animation mobs.set_mob_animation(self, "stand") - + mobs.flop(self) end end +--[[ +______ _ +| ___| | +| |_ | |_ _ +| _| | | | | | +| | | | |_| | +\_| |_|\__, | + __/ | + |___/ +]]-- + +-- state switching logic (stand, walk, run, attacks) +local fly_state_list_wandering = {"stand", "fly"} + +local fly_state_switch = function(self, dtime) + self.state_timer = self.state_timer - dtime + if self.wandering and self.state_timer <= 0 then + self.state_timer = math.random(4,10) + math.random() + self.state = fly_state_list_wandering[math.random(1,#fly_state_list_wandering)] + end +end + + +--check if a mob needs to turn while flyming +local fly_turn_check = function(self,dtime) + + local pos = self.object:get_pos() + pos.y = pos.y + 0.1 + local dir = minetest_yaw_to_dir(self.yaw) + + local collisionbox = self.object:get_properties().collisionbox + local radius = collisionbox[4] + 0.5 + + vector_multiply(dir, radius) + + local test_dir = vector.add(pos,dir) + + local green_flag_1 = minetest_get_item_group(minetest_get_node(test_dir).name, "solid") ~= 0 + + return(green_flag_1) +end + +--this is to swap the built in engine acceleration modifier +local fly_physics_swapper = function(self,inside_fly_node) + + --should be flyming, gravity is applied, switch to floating + if inside_fly_node and self.object:get_acceleration().y ~= 0 then + self.object:set_acceleration(vector_new(0,0,0)) + --not be fly, gravity isn't applied, switch to falling + elseif not inside_fly_node and self.object:get_acceleration().y == 0 then + self.pitch = 0 + self.object:set_acceleration(vector_new(0,-self.gravity,0)) + end +end + + +local random_pitch_multiplier = {-1,1} +-- states are executed here +local fly_state_execution = function(self,dtime) + + local pos = self.object:get_pos() + pos.y = pos.y + self.object:get_properties().collisionbox[5] + local current_node = minetest_get_node(pos).name + local inside_fly_node = minetest_get_item_group(current_node, "solid") == 0 + + --recheck if in water or lava + if minetest_get_item_group(current_node, "water") ~= 0 or minetest_get_item_group(current_node, "lava") ~= 0 then + inside_fly_node = false + end + + --turn gravity on or off + fly_physics_swapper(self,inside_fly_node) + + --fly properly if inside fly node + if inside_fly_node then + if self.state == "stand" then + + --do animation + mobs.set_mob_animation(self, "stand") + + mobs.set_fly_velocity(self,0) + + elseif self.state == "fly" then + + self.walk_timer = self.walk_timer - dtime + + --reset the walk timer + if self.walk_timer <= 0 then + + --re-randomize the walk timer + self.walk_timer = math.random(1,6) + math.random() + + --set the mob into a random direction + self.yaw = (math_random() * (math.pi * 2)) + + --create a truly random pitch, since there is no easy access to pitch math that I can find + self.pitch = math_random() * random_pitch_multiplier[math_random(1,2)] + end + + --do animation + mobs.set_mob_animation(self, "walk") + + --do a quick turn to make mob continuously move + --if in a bird cage or something + if fly_turn_check(self,dtime) then + quick_rotate(self,dtime) + end + + mobs.set_fly_velocity(self,self.walk_velocity) + end + else + --make the mob float + if self.floats and minetest_get_item_group(current_node, "water") ~= 0 then + mobs.float(self) + end + end +end + + + + + + + --[[ ___ ___ _ _ _ | \/ | (_) | | (_) @@ -306,7 +430,7 @@ ___ ___ _ _ _ \_| |_/\__,_|_|_| |_| \_____/\___/ \__, |_|\___| __/ | |___/ -]] +]]-- --the main loop mobs.mob_step = function(self, dtime) @@ -322,7 +446,8 @@ mobs.mob_step = function(self, dtime) swim_state_execution(self, dtime) --flying elseif self.fly then - print("I probably should be flying >:(") + fly_state_switch(self, dtime) + fly_state_execution(self,dtime) --regular mobs that walk around else land_state_switch(self, dtime) diff --git a/mods/ENTITIES/mcl_mobs/api/mob_functions/movement.lua b/mods/ENTITIES/mcl_mobs/api/mob_functions/movement.lua index 0cf6a6ab2..76e0fe7d5 100644 --- a/mods/ENTITIES/mcl_mobs/api/mob_functions/movement.lua +++ b/mods/ENTITIES/mcl_mobs/api/mob_functions/movement.lua @@ -12,6 +12,31 @@ local vector_multiply = vector.multiply local minetest_yaw_to_dir = minetest.yaw_to_dir + +--this is a generic float function +mobs.float = function(self) + + local current_velocity = self.object:get_velocity() + + local goal_velocity = { + x = 0, + y = 5, + z = 0, + } + + local new_velocity_addition = vector.subtract(goal_velocity,current_velocity) + + new_velocity_addition.x = 0 + new_velocity_addition.z = 0 + + --smooths out mobs a bit + if vector_length(new_velocity_addition) >= 0.0001 then + self.object:add_velocity(new_velocity_addition) + end +end + + + --[[ _ _ | | | | @@ -151,6 +176,51 @@ mobs.set_swim_velocity = function(self, v) } + local new_velocity_addition = vector.subtract(goal_velocity,current_velocity) + + if vector_length(new_velocity_addition) > vector_length(goal_velocity) then + vector.multiply(new_velocity_addition, (vector_length(goal_velocity) / vector_length(new_velocity_addition))) + end + + --smooths out mobs a bit + if vector_length(new_velocity_addition) >= 0.0001 then + self.object:add_velocity(new_velocity_addition) + end +end + +--[[ +______ _ +| ___| | +| |_ | |_ _ +| _| | | | | | +| | | | |_| | +\_| |_|\__, | + __/ | + |___/ +]]-- + +-- move mob in facing direction +--this has been modified to be internal +--internal = lua (self.yaw) +--engine = c++ (self.object:get_yaw()) +mobs.set_fly_velocity = function(self, v) + + local yaw = (self.yaw or 0) + local pitch = (self.pitch or 0) + + if v == 0 then + pitch = 0 + end + + local current_velocity = self.object:get_velocity() + + local goal_velocity = { + x = (math_sin(yaw) * -v), + y = pitch, + z = (math_cos(yaw) * v), + } + + local new_velocity_addition = vector.subtract(goal_velocity,current_velocity) if vector_length(new_velocity_addition) > vector_length(goal_velocity) then