Now passing the Lua State to the physics, so that Lua can directly access physics functions.

Levels/scripts/deleteRandomObject.lua

@@ -1,10 +1,14 @@
 function trigger(objectToChange)
-    if(not this_level) then
-        print("No level found!")
+    if(not level) then
+        print("No level found in Lua!")
         return
     end
-    a = this_level:getObjectCount()
+    if(not physics) then
+        print("No physics found in Lua!")
+        return
+    end
+    a = level:getObjectCount()
     rand = math.random(0, a - 1)
-    this_level:deleteObject(rand)
+    level:deleteObject(rand)
     print("Triggered from Lua!")
 end

level.cc

@@ -57,19 +57,19 @@ void Level::load() {
     // Create a new lua state
     L = luaL_newstate();
     luaL_openlibs(L);
-    //Expose the class Level and its functions
+    //Expose the class Level and its functions to Lua
     luabridge::getGlobalNamespace(L)
         .beginClass<Level>("Level")
         .addFunction("deleteObject", &Level::deleteObject)
         .addFunction("getObjectCount", &Level::getObjectCount)
         .endClass();
-    //Push the level as a global variable
+    //Push the level to Lua as a global variable
     luabridge::push(L, this);
-    lua_setglobal(L, "this_level");
+    lua_setglobal(L, "level");
     
     
     this->physics = Physics();
-    this->physics.init();
+    this->physics.init(L);
     
     // currently hard coded should later read this stuff out of a file
     this->camera = Camera(glm::vec2(-0.8f, 0.0f), 3.0f);

physics.cc

@@ -8,15 +8,23 @@ Physics::Physics() {
 Physics::~Physics() {
 }
 
-void Physics::init()
+void Physics::init(lua_State* L)
 {
 	colConfig = new btDefaultCollisionConfiguration();
 	dispatcher = new btCollisionDispatcher(colConfig);
 	broadphase = new btDbvtBroadphase();
 	solver = new btSequentialImpulseConstraintSolver();
 	world = new btDiscreteDynamicsWorld(dispatcher,broadphase,solver,colConfig);
+    world->setGravity(btVector3(0,-10,-0));
 	
-	world->setGravity(btVector3(0,-10,-0));	
+	//Expose the class Physics and its functions
+    luabridge::getGlobalNamespace(L)
+        .beginClass<Physics>("Physics")
+        //.addFunction("", &Physics::)
+        .endClass();
+    //Push the physics to Lua as a global variable
+    luabridge::push(L, this);
+    lua_setglobal(L, "physics");
 }
 
 void Physics::takeUpdateStep(float timeDiff)

physics.hh

@@ -7,6 +7,13 @@
 #include <string>
 #include <stdio.h>
 
+extern "C" {
+#include "extern/lua/src/lua.h"
+#include "extern/lua/src/lualib.h"
+#include "extern/lua/src/lauxlib.h"
+}
+#include "extern/luabridge/LuaBridge.h"
+
 #include "entity.hh"
 
 #include "extern/bullet/src/BulletDynamics/Dynamics/btRigidBody.h"
@@ -44,7 +51,7 @@ class Physics {
     public:
     Physics();
 	~Physics();
-	void init();
+	void init(lua_State* L);
 	void takeUpdateStep(float timeDiff); //must be used in level.update to proagate the physics
 	void rollForward(glm::vec3 camPos, float strength); //self explainitory
 	void rollLeft(glm::vec3 camPos, float strength);