Function RetrieveVarFromScript

engine/gameobject/src/gameobject/comp_script.cpp:949–1010

    }

    static PropertyResult RetrieveVarFromScript(HScriptInstance script_instance,
                                        const char* property_name, PropertyType type, dmhash_t* element_ids, bool is_element, uint32_t element_index,
                                        PropertyDesc& out_value)
    {
        if (type == PROPERTY_TYPE_VECTOR3)
        {
            out_value.m_ElementIds[0] = element_ids[0];
            out_value.m_ElementIds[1] = element_ids[1];
            out_value.m_ElementIds[2] = element_ids[2];
        }
        else if (type == PROPERTY_TYPE_VECTOR4 || type == PROPERTY_TYPE_QUAT)
        {
            out_value.m_ElementIds[0] = element_ids[0];
            out_value.m_ElementIds[1] = element_ids[1];
            out_value.m_ElementIds[2] = element_ids[2];
            out_value.m_ElementIds[3] = element_ids[3];
        }

        lua_State* L = GetLuaState(script_instance);

        int top = lua_gettop(L);
        (void)top;

        // Only push the script instance if it's not present already
        dmScript::GetInstance(L);
        bool push_instance = lua_isnil(L, -1);
        lua_pop(L, 1);
        if (push_instance)
        {
            lua_rawgeti(L, LUA_REGISTRYINDEX, script_instance->m_InstanceReference);
            dmScript::SetInstance(L);
        }

        lua_rawgeti(L, LUA_REGISTRYINDEX, script_instance->m_ScriptDataReference);

        PropertyResult result = PROPERTY_RESULT_NOT_FOUND;
        lua_pushstring(L, property_name);
        lua_rawget(L, -2);
        if (!lua_isnil(L, -1))
        {
            result = LuaToVar(L, -1, out_value.m_Variant);
            if (result == PROPERTY_RESULT_OK)
            {
                if (is_element)
                {
                    out_value.m_Variant = PropertyVar(out_value.m_Variant.m_V4[element_index]);
                }
            }
        }

        lua_pop(L, 2);

        if (push_instance)
        {
            lua_pushnil(L);
            dmScript::SetInstance(L);
        }