Merge branch 'world-fake3D' of game-projects/gamecore into master

2019-07-06 18:13:51 +02:00 · 2019-07-06 18:13:51 +02:00 · 696360ac30
commit 696360ac30
parent ce48e451c1 0993f1e8bb
20 changed files with 1611 additions and 32 deletions
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@ -27,6 +27,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0

 - **camera:** Add two new camera types: "middle" and "zoom".

+- **world:** Add a fake 3D world, à la Zelda or BeatThemAll, complete with shadow support
+
 ### Changed

 - **world2D:** Use a list for bodies (hitboxes, etc) and one other for actors
--- a/examples/gameplay/moveplayer3D/actors/init.lua
+++ b/examples/gameplay/moveplayer3D/actors/init.lua
@ -0,0 +1,13 @@
+local Obj = {}
+
+-- On charge toutes les différentes types d'acteurs
+local cwd  = (...):gsub('%.init$', '') .. "."
+Obj.Player = require(cwd .. "player")
+
+Obj.index     = {}
+Obj.index["player"]   = Obj.Player
+
+Obj.collisions = {}
+Obj.collisions["wall"] = require(cwd .. "wall")
+
+return Obj
--- a/examples/gameplay/moveplayer3D/actors/parent.lua
+++ b/examples/gameplay/moveplayer3D/actors/parent.lua
@ -0,0 +1,14 @@
+local Base = require "gamecore.modules.world.actors.actor3D"
+local Parent = Base:extend()
+
+function Parent:new(world, type, x, y, z, w, h, d, isSolid)
+  self.scene = world.scene
+  Parent.super.new(self, world, type, x, y, z, w, h, d, isSolid)
+end
+
+function Parent:draw()
+  Parent.super.draw(self)
+  self:drawMainHitbox()
+end
+
+return Parent
--- a/examples/gameplay/moveplayer3D/actors/player.lua
+++ b/examples/gameplay/moveplayer3D/actors/player.lua
@ -0,0 +1,74 @@
+local cwd  = (...):gsub('%.player$', '') .. "."
+local Parent = require(cwd .. "parent")
+local Player = Parent:extend()
+
+function Player:new(world, x, y, z, id)
+  Player.super.new(self, world, "player", x, y, 0, 16, 16, 24, true)
+  self:setGravity(480)
+
+  self:setSprite("player", 8, 12)
+  self:cloneSprite()
+end
+
+function Player:updateStart(dt)
+  self.xfrc, self.yfrc = 480*3, 480*3
+
+  if self.keys["up"].isDown then
+    self.ysp = -120
+  end
+  if self.keys["down"].isDown then
+    self.ysp =  120
+  end
+  if self.keys["left"].isDown then
+    self.xsp = -120
+  end
+  if self.keys["right"].isDown then
+    self.xsp =  120
+  end
+
+  if self.keys["A"].isDown and (self.onGround) then
+    self.zsp = 280
+  end
+end
+
+function Player:updateEnd(dt)
+  self:setAnimation()
+end
+
+function Player:setAnimation()
+  local gsp = utils.math.pointDistance(0, 0, self.xsp, self.ysp)
+  self:setCustomSpeed(math.abs(gsp) / 12)
+  self:setDirection(self.xsp)
+  if (self.isPunching) then
+    self:changeAnimation("punch", false)
+  else
+  if (self.onGround) then
+    if (math.abs(self.xsp) > 0) or (math.abs(self.ysp) > 0) then
+      self:changeAnimation("walk", false)
+    else
+      self:changeAnimation("idle", true)
+    end
+  else
+    self:changeAnimation("jump", true)
+  end
+  end
+end
+
+function Player:setDirection(direction)
+  direction = direction or 0
+  if direction ~= 0 then
+    direction = utils.math.sign(direction)
+    self.direction = direction
+    self:setSpriteScallingX(direction)
+  end
+end
+
+function Player:draw()
+  Player.super.draw(self)
+end
+
+function Player:drawHUD(id)
+  love.graphics.print(id .. " test", 4, 4)
+end
+
+return Player
--- a/examples/gameplay/moveplayer3D/actors/wall.lua
+++ b/examples/gameplay/moveplayer3D/actors/wall.lua
@ -0,0 +1,10 @@
+local Base = require "gamecore.modules.world.actors.actor3D"
+local Wall = Base:extend()
+
+function Wall:new(world, x, y, z, w, h, d)
+  Wall.super.new(self, world, "wall", x, y, z, w, h, d, true)
+  self:setDebugColor(0,0,0)
+  self.boxes.Base(self, w, h, d)
+end
+
+return Wall
--- a/examples/gameplay/moveplayer3D/assets/arena.lua
+++ b/examples/gameplay/moveplayer3D/assets/arena.lua
@ -0,0 +1,380 @@
+return {
+  version = "1.2",
+  luaversion = "5.1",
+  tiledversion = "1.2.2",
+  orientation = "orthogonal",
+  renderorder = "right-down",
+  width = 30,
+  height = 30,
+  tilewidth = 16,
+  tileheight = 16,
+  nextlayerid = 5,
+  nextobjectid = 18,
+  properties = {},
+  tilesets = {
+    {
+      name = "overworld",
+      firstgid = 1,
+      filename = "overworld.tsx",
+      tilewidth = 16,
+      tileheight = 16,
+      spacing = 0,
+      margin = 0,
+      columns = 32,
+      image = "overworld.png",
+      imagewidth = 512,
+      imageheight = 240,
+      tileoffset = {
+        x = 0,
+        y = 0
+      },
+      grid = {
+        orientation = "orthogonal",
+        width = 16,
+        height = 16
+      },
+      properties = {},
+      terrains = {},
+      tilecount = 480,
+      tiles = {}
+    }
+  },
+  layers = {
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+      id = 1,
+      name = "Calque de Tile 1",
+      x = 0,
+      y = 0,
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+      opacity = 1,
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+      properties = {},
+      objects = {
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+          name = "",
+          type = "",
+          shape = "rectangle",
+          x = 48,
+          y = 80,
+          width = 16,
+          height = 16,
+          rotation = 0,
+          visible = true,
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+          }
+        },
+        {
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+          name = "",
+          type = "",
+          shape = "rectangle",
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+          y = 80,
+          width = 16,
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+          rotation = 0,
+          visible = true,
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+          y = 272,
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+          height = 32,
+          rotation = 0,
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+          properties = {}
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+        {
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+          name = "",
+          type = "",
+          shape = "rectangle",
+          x = 256,
+          y = 368,
+          width = 32,
+          height = 32,
+          rotation = 0,
+          visible = true,
+          properties = {}
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+        {
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+          name = "",
+          type = "",
+          shape = "rectangle",
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+          width = 32,
+          height = 32,
+          rotation = 0,
+          visible = true,
+          properties = {}
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+          name = "",
+          type = "",
+          shape = "rectangle",
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+          y = 288,
+          width = 32,
+          height = 32,
+          rotation = 0,
+          visible = true,
+          properties = {}
+        }
+      }
+    }
+  }
+}
--- a/examples/gameplay/moveplayer3D/assets/arena.tmx
+++ b/examples/gameplay/moveplayer3D/assets/arena.tmx
@ -0,0 +1,108 @@
+<?xml version="1.0" encoding="UTF-8"?>
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+ <tileset firstgid="1" source="overworld.tsx"/>
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+ </layer>
+ <layer id="2" name="Rochers" width="30" height="30">
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+ </layer>
+ <objectgroup id="3" name="player">
+  <object id="1" x="48" y="80" width="16" height="16">
+   <properties>
+    <property name="id" type="int" value="1"/>
+   </properties>
+  </object>
+  <object id="2" x="416" y="80" width="16" height="16">
+   <properties>
+    <property name="id" type="int" value="1"/>
+   </properties>
+  </object>
+  <object id="3" x="48" y="416" width="16" height="16">
+   <properties>
+    <property name="id" type="int" value="3"/>
+   </properties>
+  </object>
+  <object id="4" x="416" y="416" width="16" height="16">
+   <properties>
+    <property name="id" type="int" value="4"/>
+   </properties>
+  </object>
+ </objectgroup>
+ <objectgroup id="4" name="wall">
+  <object id="5" x="0" y="0" width="480" height="64"/>
+  <object id="6" x="448" y="64" width="32" height="416"/>
+  <object id="7" x="32" y="448" width="416" height="32"/>
+  <object id="8" x="0" y="64" width="32" height="416"/>
+  <object id="9" x="112" y="128" width="32" height="32"/>
+  <object id="10" x="272" y="128" width="32" height="32"/>
+  <object id="12" x="368" y="112" width="32" height="32"/>
+  <object id="13" x="192" y="224" width="32" height="32"/>
+  <object id="14" x="352" y="272" width="32" height="32"/>
+  <object id="15" x="256" y="368" width="32" height="32"/>
+  <object id="16" x="128" y="384" width="32" height="32"/>
+  <object id="17" x="80" y="288" width="32" height="32"/>
+ </objectgroup>
+</map>
--- a/examples/gameplay/moveplayer3D/assets/overworld.png
+++ b/examples/gameplay/moveplayer3D/assets/overworld.png
--- a/examples/gameplay/moveplayer3D/assets/overworld.tsx
+++ b/examples/gameplay/moveplayer3D/assets/overworld.tsx
@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<tileset version="1.2" tiledversion="1.2.2" name="overworld" tilewidth="16" tileheight="16" tilecount="480" columns="32">
+ <image source="overworld.png" width="512" height="240"/>
+</tileset>
--- a/examples/gameplay/moveplayer3D/init.lua
+++ b/examples/gameplay/moveplayer3D/init.lua
@ -0,0 +1,40 @@
+-- scenes/moveplayer3D :: a basic player movement example in fake3D
+
+--[[
+  Copyright © 2019 Kazhnuz
+
+  Permission is hereby granted, free of charge, to any person obtaining a copy of
+  this software and associated documentation files (the "Software"), to deal in
+  the Software without restriction, including without limitation the rights to
+  use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+  the Software, and to permit persons to whom the Software is furnished to do so,
+  subject to the following conditions:
+
+  The above copyright notice and this permission notice shall be included in all
+  copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+  FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+  COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+  IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+  CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+]]
+
+local Scene = require "gamecore.modules.scenes"
+local MovePlayer = Scene:extend()
+
+local World = require "gamecore.modules.world.world3D"
+
+function MovePlayer:new()
+  MovePlayer.super.new(self)
+  self.assets:batchImport("examples.gameplay.plateform.assets")
+
+  World(self, "examples.gameplay.moveplayer3D.actors", "examples/gameplay/moveplayer3D/assets/arena.lua")
+  self.world:setPlayerNumber(1)
+
+  self.world:loadMap()
+  self.world.obj.collisions["wall"](self.world, 0,0,-16,1000, 1000, 16)
+end
+
+return MovePlayer
--- a/examples/init.lua
+++ b/examples/init.lua
@ -6,5 +6,6 @@ return {
  Inventory = require "examples.menus.inventory",
  Options = require "examples.menus.options",
  MovePlayer = require "examples.gameplay.moveplayer",
+  MovePlayer3D = require "examples.gameplay.moveplayer3D",
  Plateformer = require "examples.gameplay.plateform"
 }
--- a/examples/mainmenu/init.lua
+++ b/examples/mainmenu/init.lua
@ -46,7 +46,7 @@ function MainMenu:new()
  self:addSubMenu("gameplay", "gameplay")
  self:addScene("gameplay", examples.MovePlayer, "movable")
  self:addScene("gameplay", examples.Plateformer, "plateform")
-
+  self:addScene("gameplay", examples.MovePlayer3D, "movable3D")

  self.menusystem:setSoundFromSceneAssets("navigate")

--- a/gamecore/modules/world/actors/actor2D.lua
+++ b/gamecore/modules/world/actors/actor2D.lua
@ -193,6 +193,10 @@ end
 -- DRAW FUNCTIONS
 -- Draw the actors.

+function Actor3D:getShape()
+  return (self.x), (self.y), self.w, (self.h)
+end
+
 function Actor2D:draw()
  self:drawStart()
  local x, y = math.floor(self.x), math.floor(self.y)
--- a/gamecore/modules/world/actors/actor3D.lua
+++ b/gamecore/modules/world/actors/actor3D.lua
@ -0,0 +1,297 @@
+-- actor3D.lua :: the implementation of a 2D actor. It contain every element
+-- needed to create your own 2D actors.
+
+--[[
+  Copyright © 2019 Kazhnuz
+
+  Permission is hereby granted, free of charge, to any person obtaining a copy of
+  this software and associated documentation files (the "Software"), to deal in
+  the Software without restriction, including without limitation the rights to
+  use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+  the Software, and to permit persons to whom the Software is furnished to do so,
+  subject to the following conditions:
+
+  The above copyright notice and this permission notice shall be included in all
+  copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+  FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+  COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+  IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+  CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+]]
+
+local cwd   = (...):gsub('%.actor3D$', '') .. "."
+local BaseActor = require(cwd .. "baseactor")
+local Actor3D = BaseActor:extend()
+
+local Hitbox  = require(cwd .. "utils.hitbox3D")
+local Boxes   = require(cwd .. "utils.boxes")
+
+-- INIT FUNCTIONS
+-- Initialise the actor and its base functions
+
+function Actor3D:new(world, type, x, y, z, w, h, d, isSolid)
+  Actor3D.super.new(self, world, type, x, y, z, w, h, d, isSolid)
+  self:initHitboxes()
+  self.world:registerShape(self)
+  self.boxes = Boxes
+  self.doCastShadows = true
+end
+
+function Actor3D:destroy()
+  self:removeOldShadowTargets()
+  if self.box ~= nil then
+    self.world:removeTerrain(self)
+  end
+  self.world:removeActor(self)
+  self.mainHitbox:destroy()
+  self.world:removeShape(self)
+  self.isDestroyed = true
+end
+
+-- PHYSICS FUNCTIONS
+-- Handle movement and collisions.
+
+function Actor3D:autoMove(dt)
+  self:updateHitboxes()
+  self.onGround = false
+  self:applyGravity(dt)
+
+  local dx, dy, dz = self:getFuturePosition(dt)
+  local newx, newy, newz, cols, colNumber = self:move(dx, dy, dz)
+
+  -- apply after the movement the friction, until the player stop
+  -- note: the friction is applied according to the delta time,
+  -- thus the friction should be how much speed is substracted in 1 second
+
+  self:solveAllCollisions(cols)
+
+  self:applyFriction(dt)
+end
+
+function Actor3D:changeSpeedToCollisionNormal(normal)
+  local xsp, ysp, zsp = self.xsp, self.ysp, self.zsp
+  local nx, ny, nz = normal.x, normal.y, normal.z
+
+  if (nx < 0 and xsp > 0) or (nx > 0 and xsp < 0) then
+    xsp = -xsp * self.bounceFactor
+  end
+
+  if (ny < 0 and ysp > 0) or (ny > 0 and ysp < 0) then
+    ysp = -ysp * self.bounceFactor
+  end
+
+  if (nz < 0 and zsp > 0) or (nz > 0 and zsp < 0) then
+    zsp = -zsp * self.bounceFactor
+  end
+
+  self.xsp, self.ysp, self.zsp = xsp, ysp, zsp
+end
+
+function Actor3D:move(dx, dy, dz)
+  local cols, colNumber = {}, 0
+  local oldx, oldy, oldz = self.x, self.y, self.z
+  if (self.isDestroyed == false) then
+    self.x, self.y, self.z, cols, colNumber = self.mainHitbox:checkCollision(dx, dy, dz, self.filter)
+    self.mainHitbox:updatePosition()
+    self.world:updateShape(self)
+  end
+
+  if (oldx ~= self.x) or (oldy ~= self.y) or (oldz ~= self.z) or (self.shadowTargetsPrevious == nil) then
+    if (self.doCastShadows) then
+      self:castShadow()
+    end
+  end
+
+  return self.x, self.y, self.z, cols, colNumber
+end
+
+function Actor3D:checkCollision(dx, dy, dz)
+  local x, y, z, cols, colNumber = dx, dy, dz, {}, 0
+  if (self.isDestroyed == false) then
+    x, y, z, cols, colNumber = self.mainHitbox:checkCollision(dx, dy, dz, self.filter)
+  end
+  return self.x, self.y, self.z, cols, colNumber
+end
+
+-- GRAVITY SYSTEM FUNCTIONS
+-- All functions related to gravity
+
+function Actor3D:applyGravity(dt)
+  local grav = self.grav * -1
+  self.zsp = self.zsp + (grav * dt)
+
+  if utils.math.sign(self.zsp) == utils.math.sign(grav) then
+    self:checkGround( )
+  end
+end
+
+function Actor3D:checkGround()
+  local dx, dy, dz = self.x, self.y, self.z - utils.math.sign(self.grav)
+  local newx, newy, newz, cols, colNumber = self:checkCollision(dx, dy, dz)
+  for i, col in ipairs(cols) do
+    if (col.type == "touch") or (col.type == "bounce") or (col.type == "slide") then
+      if not (self.grav == 0) then
+        if col.normal.z == utils.math.sign(self.grav) then self.onGround = true end
+      end
+    end
+  end
+end
+
+-- COORDINATE/MOVEMENT FUNCTIONS
+-- Handle coordinate
+
+function Actor3D:getViewCenter()
+  local x, y, z = self:getCenter()
+  return x, y - (self.d/2)
+end
+
+-- HITBOXES FUNCTIONS
+-- Functions related to actor hitboxes
+
+function Actor3D:addHitboxFromFrameData(framedata, animationID, frameID, hitboxID)
+  local sx, sy = self:getSpriteScalling()
+  local type  = framedata[1]
+  local ox    = framedata[2]
+  local oy    = framedata[3]
+  local oz    = framedata[4]
+  local w     = framedata[5]
+  local h     = framedata[6]
+  local d     = framedata[7]
+  local isSolid = framedata[8] or false
+  local anim  = animationID or "null"
+  local frame = frameID or 0
+  local id    = hitboxID or 0
+  if (sx < 0) then
+    ox = self.w - ox - w
+  end
+  if (sy < 0) then
+    oz = self.d - oz - d
+  end
+
+  if (type == "main") then
+    self.mainHitbox:modify(ox, oy, oz, w, h, d)
+  else
+    local hitboxName = anim .. frame .. type .. id
+    self:addHitbox(hitboxName, type, ox, oy, oz, w, h, d, isSolid)
+    return hitboxName
+  end
+end
+
+function Actor3D:initMainHitbox()
+  self.mainHitbox = Hitbox(self, self.type, 0, 0, 0, self.w, self.h, self.d, self.isSolid)
+  self.mainHitbox:advertiseAsMainHitbox()
+end
+
+function Actor3D:addHitbox(name, type, ox, oy, oz, w, h, d, isSolid)
+  if (self.hitboxes[name] ~= nil) then
+    print("ERROR:", "The hitbox " .. name .. " already exists")
+  else
+    local hitbox = Hitbox(self, type, ox, oy, oz, w, h, d, isSolid)
+    self.hitboxes[name] = hitbox
+    return hitbox
+  end
+end
+
+function Actor3D:checkHitboxCollisions(name, filter)
+  self:checkHitboxCollisionsAtPoint(name, self.x, self.y, self.z, filter)
+end
+
+function Actor3D:checkHitboxCollisionsAtPoint(name, dx, dy, dz, filter)
+    local x, y, z, cols, colNumber = dx, dy, dz, {}, 0
+    local filter = filter or self.filter
+    if (self.isDestroyed == false) and (self.hitboxes[name] ~= nil) then
+      x, y, z, cols, colNumber = self.hitboxes[name]:checkCollision(dx, dy, dz, filter)
+      local type = self.hitboxes[name].type
+
+      for i, col in ipairs(cols) do
+        self:hitboxResponse(name, type, col)
+      end
+    end
+
+    return x, y, z, cols, colNumber
+end
+
+-- SHADOW FUNCTIONS
+-- Handle everything related to shadow
+
+function Actor3D:castShadow()
+  local shadowTargets = self.world:getTerrainInRect(self.x, self.y, self.w, self.d)
+  -- initialize the shadowTargetsPrevious variable if it doesn't exist
+  if (self.shadowTargetsPrevious == nil) then
+    self.shadowTargetsPrevious = {}
+  end
+
+  for i, target in ipairs(shadowTargets) do
+    -- We test if the actor is below the current actor
+    if (target ~= self) and (target.box ~= nil) then
+
+      if (target.z + target.d <= self.z + self.d) then
+        -- Remove the target of the list of item targeted last update,
+        -- in order to only have object no longer shadowed after the
+        -- end of the loop
+        for j, oldtarget in ipairs(self.shadowTargetsPrevious) do
+          if (target == oldtarget) then
+            table.remove(self.shadowTargetsPrevious, j)
+          end
+        end
+
+        -- We update the shadow source
+        local x, y = math.floor(self.x - target.x), math.floor(self.y - target.y)
+        target.box:setShadowSource(self, x, y)
+      end
+
+    end
+
+  end
+
+  -- At this point, if a target is still in the shadowTargetsPrevious list,
+  -- it mean that it's not shadowed. So we can simply remove the shadow.
+  self:removeOldShadowTargets()
+
+  self.shadowTargetsPrevious = shadowTargets
+end
+
+function Actor3D:removeOldShadowTargets()
+  if (self.shadowTargetsPrevious ~= nil) then
+    for i, target in ipairs(self.shadowTargetsPrevious) do
+      if (target.box ~= nil) then
+        target.box:removeShadowSource(self)
+      end
+    end
+  end
+end
+
+function Actor3D:redrawShadowCanvas()
+  if (self.box ~= nil) then
+    self.box:redrawShadowCanvas()
+  end
+end
+
+-- DRAW FUNCTIONS
+-- Draw the actors.
+
+function Actor3D:drawShadow(x, y)
+  love.graphics.setColor(0, 0, 0, 1)
+  love.graphics.rectangle("fill", x, y, self.w, self.h)
+  utils.graphics.resetColor()
+end
+
+function Actor3D:getShape()
+  return (self.x), (self.y - self.z - self.d), self.w, (self.h + self.d)
+end
+
+function Actor3D:draw()
+  self:drawStart()
+  if (self.box ~= nil) then
+    self.box:draw(self.x, self.y, self.z)
+  else
+    local x, y = math.floor(self.x), math.floor(self.y - self.z - self.d + (self.h/2))
+    self:drawSprite(x, y)
+  end
+  self:drawEnd()
+end
+
+return Actor3D
--- a/gamecore/modules/world/actors/utils/boxes/init.lua
+++ b/gamecore/modules/world/actors/utils/boxes/init.lua
@ -0,0 +1,30 @@
+-- box3D :: drawable box with shadow handling for fake3D actors
+
+--[[
+  Copyright © 2019 Kazhnuz
+
+  Permission is hereby granted, free of charge, to any person obtaining a copy of
+  this software and associated documentation files (the "Software"), to deal in
+  the Software without restriction, including without limitation the rights to
+  use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+  the Software, and to permit persons to whom the Software is furnished to do so,
+  subject to the following conditions:
+
+  The above copyright notice and this permission notice shall be included in all
+  copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+  FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+  COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+  IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+  CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+]]
+
+local cwd   = (...):gsub('%.init$', '') .. "."
+
+local Boxes = {}
+
+Boxes.Base = require(cwd .. "parent")
+
+return Boxes
--- a/gamecore/modules/world/actors/utils/boxes/parent.lua
+++ b/gamecore/modules/world/actors/utils/boxes/parent.lua
@ -0,0 +1,156 @@
+-- box3D :: drawable box with shadow handling for fake3D actors
+
+--[[
+  Copyright © 2019 Kazhnuz
+
+  Permission is hereby granted, free of charge, to any person obtaining a copy of
+  this software and associated documentation files (the "Software"), to deal in
+  the Software without restriction, including without limitation the rights to
+  use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+  the Software, and to permit persons to whom the Software is furnished to do so,
+  subject to the following conditions:
+
+  The above copyright notice and this permission notice shall be included in all
+  copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+  FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+  COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+  IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+  CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+]]
+
+local Box3D = Object:extend()
+
+function Box3D:new(owner, w, h, d)
+  self.owner    = owner
+  self.world    = owner.world
+  self.cameras  = self.world.cameras
+
+  self.w = w
+  self.h = h
+  self.d = d
+
+  self.haveLine = true
+
+  self.shadowSources = {}
+  self.needRedraw = false
+
+  self.texture = {}
+  self:setTopTexture()
+  self:setBottomTexture()
+  self.texture.shadows = nil
+
+  self:register()
+end
+
+function Box3D:register()
+  self.owner.box = self
+  self.world:registerTerrain(self.owner)
+end
+
+function Box3D:setSizeFromOwner()
+  self:setSize(self.owner.w, self.owner.h, self.owner.d)
+end
+
+function Box3D:setSize()
+  self.w = w
+  self.h = h
+  self.d = d
+
+  self:regenerate()
+end
+
+function Box3D:setTopTexture()
+  local canvas = love.graphics.newCanvas(self.w, self.h)
+  love.graphics.setCanvas( canvas )
+  utils.graphics.resetColor()
+  love.graphics.rectangle("fill", 0, 0, self.w, self.h)
+  love.graphics.setCanvas( )
+  local imagedata = canvas:newImageData()
+  self.texture.top = love.graphics.newImage( imagedata )
+  imagedata:release()
+  canvas:release()
+end
+
+function Box3D:setBottomTexture()
+  local canvas = love.graphics.newCanvas(self.w, self.d)
+  love.graphics.setCanvas( canvas )
+  love.graphics.setColor(0.9, 0.9, 0.9, 1)
+  love.graphics.rectangle("fill", 0, 0, self.w, self.d)
+  utils.graphics.resetColor()
+  love.graphics.setCanvas( )
+  local imagedata = canvas:newImageData()
+  self.texture.bottom = love.graphics.newImage( imagedata )
+  imagedata:release()
+  canvas:release()
+end
+
+function Box3D:setShadowSource(actor, x, y)
+  local foundShadow = false
+
+  for i,v in ipairs(self.shadowSources) do
+    if (v.actor == actor) then
+      if (v.x ~= x) or (v.y ~= y) then
+        v.x = x
+        v.y = y
+        self.needRedraw = true
+      end
+      foundShadow = true
+    end
+  end
+
+  if (foundShadow == false) then
+    local shadow = {}
+    shadow.actor = actor
+    shadow.x = x
+    shadow.y = y
+    self.needRedraw   = true
+
+    table.insert(self.shadowSources, shadow)
+  end
+end
+
+function Box3D:removeShadowSource(actor)
+  for i,v in ipairs(self.shadowSources) do
+    if (v.actor == actor) then
+      table.remove(self.shadowSources, i)
+      self.needRedraw = true
+    end
+  end
+end
+
+function Box3D:redrawShadowCanvas()
+  if (self.needRedraw) then
+    local canvas = love.graphics.newCanvas(self.w, self.h)
+    love.graphics.setCanvas( canvas )
+    for i,v in ipairs(self.shadowSources) do
+      v.actor:drawShadow(v.x, v.y)
+    end
+
+    love.graphics.setCanvas( )
+
+    local imagedata = canvas:newImageData()
+    self.texture.shadows = love.graphics.newImage( imagedata )
+    imagedata:release()
+    canvas:release()
+
+    self.needRedraw = false
+  end
+end
+
+function Box3D:draw(x, y, z)
+  love.graphics.setColor(0, 0, 0, 1)
+  if (self.haveLine) then
+    love.graphics.rectangle("line", x, (y-z) - (self.d), self.w, self.d + self.h)
+  end
+  utils.graphics.resetColor()
+  love.graphics.draw(self.texture.top, x, (y-z) - (self.d))
+  love.graphics.draw(self.texture.bottom, x, (y-z) - (self.d) + (self.h))
+  if (self.texture.shadows ~= nil) and (#self.shadowSources > 0) then
+    love.graphics.draw(self.texture.shadows, x, (y-z) - (self.d))
+  end
+end
+
+return Box3D
--- a/gamecore/modules/world/actors/utils/hitbox3D.lua
+++ b/gamecore/modules/world/actors/utils/hitbox3D.lua
@ -0,0 +1,129 @@
+-- hitbox3D.lua :: a basic 3D hitbox object. It's used by the actors to check
+-- collisions and to handle different type of responses.
+
+--[[
+  Copyright © 2019 Kazhnuz
+
+  Permission is hereby granted, free of charge, to any person obtaining a copy of
+  this software and associated documentation files (the "Software"), to deal in
+  the Software without restriction, including without limitation the rights to
+  use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+  the Software, and to permit persons to whom the Software is furnished to do so,
+  subject to the following conditions:
+
+  The above copyright notice and this permission notice shall be included in all
+  copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+  FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+  COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+  IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+  CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+]]
+
+local Hitbox3D = Object:extend()
+
+-- INIT FUNCTIONS
+-- Initialise the actor and its base functions
+
+function Hitbox3D:new(owner, type, ox, oy, oz, w, h, d, isSolid)
+  self.owner    = owner
+  self.world    = owner.world
+
+  self.type     = type
+  self.ox       = ox
+  self.oy       = oy
+  self.oz       = oz
+  self.x, self.y, self.z = self:getPosition()
+  self.w        = w
+  self.h        = h
+  self.d        = d
+  self.isSolid  = isSolid
+
+  self.isMainHitBox = false
+
+  self:setDebugColor(0,0,0)
+  self:register()
+end
+
+function Hitbox3D:advertiseAsMainHitbox()
+  self.isMainHitBox = true
+end
+
+function Hitbox3D:modify(ox, oy, oz, w, h, d)
+  self.ox       = ox
+  self.oy       = oy
+  self.oz       = oz
+  self.x, self.y, self.z = self:getPosition()
+  self.w        = w
+  self.h        = h
+  self.d        = d
+end
+
+function Hitbox3D:setDebugColor(r,g,b)
+  self.debug = {}
+  self.debug.r = r
+  self.debug.g = g
+  self.debug.b = b
+end
+
+function Hitbox3D:register()
+  self.world:registerBody(self)
+end
+
+function Hitbox3D:destroy()
+  self.world:removeBody(self)
+end
+
+-- COORDINATE FUNCTIONS
+-- Handle Hitbox position
+
+function Hitbox3D:updatePosition()
+  self.x, self.y, self.z = self:getPosition()
+  self.world:updateBody(self)
+  return self.x, self.y, self.z
+end
+
+function Hitbox3D:getPosition()
+  return self.ox + self.owner.x, self.oy + self.owner.y, self.oz + self.owner.z
+end
+
+function Hitbox3D:getOwnerPosition()
+  return self.x - self.ox, self.y - self.oy, self.z - self.oz
+end
+
+function Hitbox3D:getNewOwnerPosition(x, y, z)
+  return x - self.ox, y - self.oy, z - self.oz
+end
+
+function Hitbox3D:getCenter()
+  return self.x + (self.w/2), self.y + (self.h/2), self.z + (self.d/2)
+end
+
+-- COLLISION FUNCTIONS
+-- Handle Hitbox position
+
+function Hitbox3D:checkCollision(dx, dy, dz, filter)
+  self:updatePosition()
+
+  local dx, dy = self.ox + dx, self.oy + dy, self.oz + dz
+  local x, y, z, cols, colNumber = self.world:checkCollision(self, dx, dy, dz, filter)
+  local newx, newy, newz = self:getNewOwnerPosition(x, y, z)
+
+  return newx, newy, newz, cols, colNumber
+end
+
+-- DRAW FUNCTIONS
+-- Just some debug function to draw hitbox
+
+function Hitbox3D:draw()
+  local x, y, z = self:getPosition()
+  love.graphics.setColor(self.debug.r, self.debug.g, self.debug.b, 1)
+  utils.graphics.box(x, (y-z) - (self.d), self.w, self.h)
+  love.graphics.setColor(self.debug.r/2, self.debug.g/2, self.debug.b/2, 1)
+  utils.graphics.box(x, (y-z) - (self.d) + (self.h), self.w, self.d)
+  utils.graphics.resetColor()
+end
+
+return Hitbox3D
--- a/gamecore/modules/world/baseworld.lua
+++ b/gamecore/modules/world/baseworld.lua
@ -144,15 +144,30 @@ end


 function BaseWorld:getVisibleActors(id)
-  local camx, camy, camw, camh = self.cameras:getViewCoordinate(id)
-  local paddingw  = camw * PADDING_VALUE
-  local paddingh  = camh * PADDING_VALUE
-  local x = camx - paddingw
-  local y = camy - paddingh
-  local w = camw + paddingw * 2
-  local h = camh + paddingh * 2
+  local actors = {}
+  if (id ~= nil) then
+    local camx, camy, camw, camh = self.cameras:getViewCoordinate(id)
+    local paddingw  = camw * PADDING_VALUE
+    local paddingh  = camh * PADDING_VALUE
+    local x = camx - paddingw
+    local y = camy - paddingh
+    local w = camw + paddingw * 2
+    local h = camh + paddingh * 2

-  return self:getActorsInRect(x, y, w, h)
+    actors = self:getActorsInRect(x, y, w, h)
+  else
+    actors = self:getActors()
+  end
+
+  table.sort(actors, function(a,b)
+    if (a.depth == b.depth) then
+      return a.creationID < b.creationID
+    else
+      return a.depth > b.depth
+    end
+  end)
+
+  return actors
 end

 -- BODIES MANAGEMENT FUNCTIONS
@ -426,20 +441,7 @@ function BaseWorld:draw(dt)
 end

 function BaseWorld:drawActors(id)
-  local actors
-  if (id == nil) then
-    actors = self:getActors()
-  else
-    actors = self:getVisibleActors(id)
-  end
-
-  table.sort(actors, function(a,b)
-    if (a.depth == b.depth) then
-      return a.creationID < b.creationID
-    else
-      return a.depth > b.depth
-    end
-  end)
+  local actors = self:getVisibleActors(id)

  for i,v in ipairs(actors) do
    v:draw()
--- a/gamecore/modules/world/camera.lua
+++ b/gamecore/modules/world/camera.lua
@ -357,18 +357,19 @@ function CameraSystem:followAllActors(id)
  if (#self.targets > 0) then
    local minX, minY, maxX, maxY
    for i, target in ipairs(self.targets) do
-      local xx, yy = target:getViewCenter()
+      local x, y, w, h = target:getShape()
+      local x2, y2 = x + w, y + h
      -- If start by initializing the value at the first found value
-      if (minX == nil) then minX = xx - (target.w/2) end
-      if (maxX == nil) then maxX = xx + (target.w/2) end
-      if (minY == nil) then minY = yy - (target.h/2) end
-      if (maxY == nil) then maxY = yy + (target.h/2) end
+      if (minX == nil) then minX = x  end
+      if (maxX == nil) then maxX = x2 end
+      if (minY == nil) then minY = y  end
+      if (maxY == nil) then maxY = y2 end


-      minX = math.min(minX, xx - (target.w/2))
-      maxX = math.max(maxX, xx + (target.w/2))
-      minY = math.min(minY, yy - (target.h/2))
-      maxY = math.max(maxY, yy + (target.h/2))
+      minX = math.min(minX, x)
+      maxX = math.max(maxX, x2)
+      minY = math.min(minY, y)
+      maxY = math.max(maxY, y2)
    end

    -- Add padding
--- a/gamecore/modules/world/world3D.lua
+++ b/gamecore/modules/world/world3D.lua
@ -0,0 +1,314 @@
+-- world3D.lua :: a basic fake3D world based on bump-2dpd.
+
+--[[
+  Copyright © 2019 Kazhnuz
+
+  Permission is hereby granted, free of charge, to any person obtaining a copy of
+  this software and associated documentation files (the "Software"), to deal in
+  the Software without restriction, including without limitation the rights to
+  use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+  the Software, and to permit persons to whom the Software is furnished to do so,
+  subject to the following conditions:
+
+  The above copyright notice and this permission notice shall be included in all
+  copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+  FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+  COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+  IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+  CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+]]
+
+local cwd   = (...):gsub('%.world3D$', '') .. "."
+
+local BaseWorld = require(cwd .. "baseworld")
+local World3D   = BaseWorld:extend()
+
+local Sti           = require(cwd .. "libs.sti")
+local Bump          = require(cwd .. "libs.bump")
+local Bump3D        = require(cwd .. "libs.bump-3dpd")
+local Tsort         = require(cwd .. "libs.tsort")
+local CameraSystem  = require(cwd .. "camera")
+
+local PADDING_VALUE = 10/100
+
+function World3D:new(scene, actorlist, mapfile)
+  World3D.super.new(self, scene, actorlist, mapfile)
+end
+
+-- ACTORS FUNCTIONS
+-- Add support for bodies in Actor functions
+
+function World3D:initActors()
+  self.currentCreationID  = 0
+  self.actors = {}
+  self.bodies = Bump3D.newWorld(50)
+  self:initShapes()
+  self:initTerrain()
+end
+
+function World3D:newActor(name, x, y, z)
+  self.obj.index[name](self, x, y, z)
+end
+
+function World3D:newCollision(name, x, y, z, w, h, d)
+  self.obj.collisions[name](self, x, y, z, w, h, d)
+end
+
+function World3D:moveActor(actor, x, y, z, filter)
+  return self.bodies:move(actor.mainHitbox, x, y, z, filter)
+end
+
+function World3D:getActorsInRect(x, y, w, h)
+  return self:getShapeInRect(x, y, w, h)
+end
+
+function BaseWorld:getVisibleActors(id)
+  local actors = {}
+  if (id ~= nil) then
+    local camx, camy, camw, camh = self.cameras:getViewCoordinate(id)
+    local paddingw  = camw * PADDING_VALUE
+    local paddingh  = camh * PADDING_VALUE
+    local x = camx - paddingw
+    local y = camy - paddingh
+    local w = camw + paddingw * 2
+    local h = camh + paddingh * 2
+
+    actors = self:getActorsInRect(x, y, w, h)
+  else
+    actors = self:getActors()
+  end
+
+  actors = self:zSortItems(actors)
+
+  return actors
+end
+
+
+-- PLAYER FUNCTIONS
+-- Load player stuff
+
+function World3D:addPlayer(actor, sourceid, haveCam)
+  local player = {}
+  player.actor    = actor
+  player.sourceid = sourceid or 1
+
+  table.insert(self.players, player)
+
+  self.cameras:addTarget(player.actor)
+end
+
+-- MAP LOADING FUNCTIONS
+-- Handle loading of actors from map
+
+function World3D:batchActor(objectlayer, object)
+  local name     = objectlayer.name
+  local gwidth   = object.properties.gwidth  or self.map.tilewidth
+  local gheight  = object.properties.gheight or self.map.tileheight
+  local x = object.x
+  local y = object.y
+  local z = object.properties.z or 0
+  local w = object.width
+  local h = object.height
+
+  local cellHor   = math.ceil(w / gwidth)
+  local cellVert  = math.ceil(h / gheight)
+
+  for i=1, cellHor do
+    for j=1, cellVert do
+      self:newActor(name, x + (i-1)*gwidth, y + (j-1)*gheight, z)
+    end
+  end
+end
+
+function World3D:newActorFromMap(objectlayer, object)
+  local z = object.properties.z or 0
+  self:newActor(objectlayer.name, object.x, object.y, z)
+end
+
+function World3D:newCollisionFromMap(objectlayer, object)
+  local z = object.properties.z or 0
+  local d = object.properties.d or 16
+  self:newCollision(objectlayer.name, object.x, object.y, z, object.width, object.height, d)
+end
+
+function World3D:addPlayerFromMap(object, i)
+  local z = object.properties.z or 0
+  self:addPlayer(self.obj.Player(self, object.x, object.y, z), i)
+end
+
+-- BODIES MANAGEMENT FUNCTIONS
+-- Basic function to handle bodies. Wrappers around Bump2D functions
+
+function World3D:registerBody(body)
+  return self.bodies:add(body, body.x, body.y, body.z, body.w, body.h, body.d)
+end
+
+function World3D:updateBody(body)
+  return self.bodies:update(body, body.x, body.y, body.z, body.w, body.h, body.d)
+end
+
+function World3D:removeBody(body)
+  return self.bodies:remove(body)
+end
+
+function World3D:checkCollision(body, x, y, z, filter)
+  return self.bodies:check(body, x, y, z, filter)
+end
+
+function World3D:getBodiesInRect(x, y, w, h)
+  return {} --self.bodies:queryRect(x, y, w, h)
+end
+
+-- UPDATE
+-- Update everything in the world
+
+function World3D:updateActors(dt)
+  World3D.super.updateActors(self, dt)
+  local actors = self:getActors()
+  for i,v in ipairs(actors) do
+    v:redrawShadowCanvas()
+  end
+end
+
+-- SHAPE SYSTEM
+-- Handle onscreen shapes
+
+function World3D:initShapes()
+  self.shapes = Bump.newWorld(50)
+end
+
+function World3D:registerShape(actor)
+  local x, y, w, h = actor:getShape()
+  return self.shapes:add(actor, x, y, w, h)
+end
+
+function World3D:updateShape(actor)
+  local x, y, w, h = actor:getShape()
+  return self.shapes:update(actor, x, y, w, h)
+end
+
+function World3D:removeShape(actor)
+  return self.shapes:remove(actor)
+end
+
+function World3D:checkShapeIntersection(actor, x, y)
+  return self.shapes:check(actor, x, y)
+end
+
+function World3D:getShapeInRect(x, y, w, h)
+  return self.shapes:queryRect(x, y, w, h)
+end
+
+-- TERRAIN SYSTEM
+-- Handle onscreen shapes
+
+function World3D:initTerrain()
+  self.terrains = Bump.newWorld(50)
+end
+
+function World3D:registerTerrain(actor)
+  return self.terrains:add(actor, actor.x, actor.y, actor.w, actor.h)
+end
+
+function World3D:updateTerrain(actor)
+  return self.terrains:update(actor, actor.x, actor.y, actor.w, actor.h)
+end
+
+function World3D:removeTerrain(actor)
+  return self.terrains:remove(actor)
+end
+
+function World3D:getTerrainInRect(x, y, w, h)
+  return self.terrains:queryRect(x, y, w, h)
+end
+
+-- DRAW FUNCTIONS
+-- Functions to draw the world
+
+function World3D:zSortItems(items)
+  -- zSorting algorithm taken from bump3D example, adapted to gamecore.
+  local graph = Tsort.new()
+  local noOverlap = {}
+
+  -- Iterate through all visible items, and calculate ordering of all pairs
+  -- of overlapping items.
+  -- TODO: Each pair is calculated twice currently. Maybe this is slow?
+  for _, itemA in ipairs(items) do repeat
+    local x, y, w, h = self.shapes:getRect(itemA)
+    local otherItemsFilter = function(other) return other ~= itemA end
+    local overlapping, len = self.shapes:queryRect(x, y, w, h, otherItemsFilter)
+
+    if len == 0 then
+      table.insert(noOverlap, itemA)
+
+      break
+    end
+
+    local _, aY, aZ, _, aH, aD = self.bodies:getCube(itemA.mainHitbox)
+    aDepth  = itemA.depth
+    aID     = itemA.id
+    aType   = itemA.type
+    aZ     = math.ceil(aZ)
+    aY     = math.ceil(aY)
+
+    for _, itemB in ipairs(overlapping) do
+      local _, bY, bZ, _, bH, bD = self.bodies:getCube(itemB.mainHitbox)
+      bDepth = itemB.depth
+      bID    = itemB.id
+      bType  = itemB.type
+      bZ     = math.ceil(bZ)
+      bY     = math.ceil(bY)
+
+      if aZ >= bZ + bD then
+        -- item A is completely above item B
+        graph:add(itemB, itemA)
+      elseif bZ >= aZ + aD then
+        -- item B is completely above item A
+        graph:add(itemA, itemB)
+      elseif aY + aH <= bY then
+        -- item A is completely behind item B
+        graph:add(itemA, itemB)
+      elseif bY + bH <= aY then
+        -- item B is completely behind item A
+        graph:add(itemB, itemA)
+      elseif (aY - aZ) + aH > (bY - bZ) + bH then
+        -- item A's forward-most point is in front of item B's forward-most point
+        graph:add(itemB, itemA)
+      elseif (aY - aZ) + aH < (bY - bZ) + bH then
+        -- item B's forward-most point is in front of item A's forward-most point
+        graph:add(itemA, itemB)
+      else
+        -- item A's forward-most point is the same than item B's forward-most point
+        if aDepth > bDepth then
+          graph:add(itemB, itemA)
+        elseif aDepth < bDepth then
+          graph:add(itemA, itemB)
+        else
+          if aID > bID then
+            graph:add(itemA, itemB)
+          elseif aID < bID then
+            graph:add(itemB, itemA)
+          else
+            err("two object can't have the same ID")
+          end
+        end
+      end
+    end
+  until true end
+
+  local sorted, err = graph:sort()
+  if err then
+    error(err)
+  end
+  for _, item in ipairs(noOverlap) do
+    table.insert(sorted, item)
+  end
+
+  return sorted
+
+end
+
+return World3D