Add in chicken head code with additional pitch modifier

mods/ENTITIES/mcl_mobs/api/api.lua

@@ -393,6 +393,7 @@ function mobs:register_mob(name, def)
 		--this part controls the visual of the head
 		head_bone_pos_y = def.head_bone_pos_y or 3.6,
 		head_bone_pos_z = def.head_bone_pos_z or -0.6,
+		head_pitch_modifier = def.head_pitch_modifier or 0,
 
 		--these variables are switches in case the model
 		--moves the wrong way

mods/ENTITIES/mcl_mobs/api/mob_functions/head_logic.lua

@@ -97,6 +97,10 @@ mobs.do_head_logic = function(self,dtime)
         head_pitch = minetest.dir_to_yaw(vector.new(vector.distance(vector.new(pos.x,0,pos.z),vector.new(look_at.x,0,look_at.z)),0,pos.y-look_at.y))+(math.pi/2)
     end
 
+    if self.head_pitch_modifier then
+        head_pitch = head_pitch + self.head_pitch_modifier
+    end
+
     if self.swap_y_with_x then
         self.object:set_bone_position("head", bone_pos, vector_new(degrees(head_pitch),degrees(head_yaw),0))
     else

mods/ENTITIES/mobs_mc/chicken.lua

@@ -110,6 +110,21 @@ mobs:register_mob("mobs_mc:chicken", {
 		}, true)
 	end,
 
+	--head code
+	has_head = true,
+	head_bone = "head",
+
+	swap_y_with_x = false,
+	reverse_head_yaw = false,
+
+	head_bone_pos_y = 1.675,
+	head_bone_pos_z = 0,
+
+	head_height_offset = 0.55,
+	head_direction_offset = 0.0925,
+
+	head_pitch_modifier = -math.pi/2,
+	--end head code
 })
 
 --spawn

mods/ENTITIES/mobs_mc/cow+mooshroom.lua

@@ -97,6 +97,7 @@ local cow_def = {
 
 	head_height_offset = 1.0525,
 	head_direction_offset = 0.5,
+	head_pitch_modifier = 0,
 	--end head code
 }
 

mods/ENTITIES/mobs_mc/creeper.lua

@@ -65,6 +65,7 @@ mobs:register_mob("mobs_mc:creeper", {
 
 	head_height_offset = 1.1,
 	head_direction_offset = 0,
+	head_pitch_modifier = 0,
 	--end head code
 
 	-- Force-ignite creeper with flint and steel and explode after 1.5 seconds.