I am trying to get some wheel data to find out if the tire is spinning or the car is going to lose control. Does anyone have any suggestions. So I have the following command. vObj is the vehicle vObj:queueLuaCommand("obj:queueGameEngineLua('Test = ('..streams['wheelInfo']..')')") How can I get the system to return the table wheelInfo? Also does Test need to be a global variable or can we pass the table back to a local variable.
Maybe tcsData would be better then the stream data. How can I get the entire tcsData table from the command above into my scenario?
So I changed the command to vObj:queueLuaCommand([[for i = 0, 3 do wheelData = wheels.wheels end]]) This creates a global variable wheelData. But I still get an errors 48.91718|E|libbeamng.lua.V|*** FATAL LUA ERROR: [string "string"]:1: attempt to index global 'wheelData' (a nil value) 48.91723|E|libbeamng.lua.V|=============== Stack Traceback >> START >> 48.91725|E|libbeamng.lua.V|(1) main chunk of [string "string"] at line 1 48.91727|E|libbeamng.lua.V|--------------- << END << 48.91730|E|libbeamng.lua.V|*** while executing this line: for i = 0, 3 do wheelData = wheels.wheels end If I use the print operation on this it works fine. vObj:queueLuaCommand([[for i = 0, 3 do print(wheels.wheels.name) end]])
Hi You can't concatenate tables. So, you have to extract the fields and send them across. You need to use a callback function that is setup to receive the fields. For example In your scenario have a function with the number of fields you need Code: local function wheelDataCallback(absActive) log('I','example', 'wheelDataCallback triggered....Data type is '..type(absActive)) end Then just before you make the call to VLua, assign the callback to the active scenario (simplest method, but there are also others) Code: scenarios.getScenario().wheelDataCallback = wheelDataCallback local command = string.format("obj:queueGameEngineLua('scenarios.getScenario().wheelDataCallback('..tostring(wheels.wheels[0].absActive)..')')") vObj:queueLuaCommand(command) Hope this helps.
Thank you! I was thinking about doing this for each wheel and multiple fields. Would something like this work? Example: scenarios.getScenario().wheelDataCallback = wheelDataCallback vObj:queueLuaCommand("for i,v in pairs(wheels.wheels) do obj:queueGameEngineLua('scenarios.getScenario().wheelDataCallback('..tostring(v)..','..tostring(i)..')') end")
I almost have this working. Can the function call return more than one variable at a time? Here is what I have: local function wheelDataCallback(n,value,i) log('I','example', 'wheelDataCallback triggered....Data type is '..type(n)) log('I','example', 'wheelDataCallback triggered....Data type is '..type(value)) log('I','example', 'wheelDataCallback triggered....Data type is '..type(i)) end scenarios.getScenario().wheelDataCallback = wheelDataCallback vObj:queueLuaCommand([[for i,v in pairs(wheels.wheels) do for n,value in pairs(v) do if n == "name" then obj:queueGameEngineLua('scenarios.getScenario().wheelDataCallback('..tostring(n)..','..tostring(value)..','..tostring(i)..')') end end end]]) It works except that I get n = nil value = nil i = numer: 3 If I cause an error by removing type() in the log line I get more details. It looks like the function call is working because I can see "scenarios.getScenario().wheelDataCallback(name,FR,0)". 38.68008|E|GameEngineLua|*** FATAL LUA ERROR: lua/scenario/derby_main.lua:383: attempt to concatenate local 'n' (a nil value) =============== Stack Traceback >> START >> (1) Lua field 'wheelDataCallback' at file 'lua/scenario/derby_main.lua:383' Local variables: n = nil value = nil i = number: 3 (*temporary) = Lua function '?' (defined at line 13 of chunk "lua/ge/main.lua"]) (*temporary) = string: "I" (*temporary) = string: "example" (*temporary) = string: "wheelDataCallback triggered....Data type is " (*temporary) = nil (*temporary) = string: "attempt to concatenate local 'n' (a nil value)" (2) main chunk of [string "line"] at line 1 --------------- << END << 38.68012|E|GameEngineLua|*** while executing this line: scenarios.getScenario().wheelDataCallback(name,FR,3)
This is working by changing the tostring to serialize. What does the serialize do? local command = string.format("obj:queueGameEngineLua('scenarios.getScenario().wheelDataCallback('..serialize(wheels.wheels[0].absActive)..')')")
Hi, calling the callback once per field would be too slow. You can make the callback take more than 1 parameter, this allows you to access the directly using a named variable Code: local function wheelDataCallback(arg1, arg2, arg3) log('I','example', 'wheelDataCallback triggered....with '..arg1..','..arg2..','..arg3) end You could also make it take a variable number of arguments, but this is more complicated and requires processing Code: local function wheelDataCallback(...) -- here you'd have to process the ... to extract the arguments end In your case, you should send across a table with the fields you want Code: local command = "obj:queueGameEngineLua(string.format('scenario_scenarios.getScenario().wheelDataCallback(%s)', serialize({absActive=wheels.wheels[0].absActive, angularVelocity=wheels.wheels[0].angularVelocity, angularVelocityBrakeCouple=wheels.wheels[0].angularVelocityBrakeCouple})))" Then the callback should change to processing the table Code: local function wheelDataCallback(data) log('I','example', 'wheelDataCallback triggered....with ') dump(data) log('I','example', 'Abs is Active: '..tostring(data.absActive)) end Good luck.
