Vehicle Lua to GE lua

Discussion in 'Programming' started by NuclearKnight, Jan 6, 2022.

  1. NuclearKnight

    NuclearKnight
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    Joined:
    Nov 30, 2013
    Messages:
    50
    I'm much closer now to completing my mod but there is something that is causing me a lot of headache. Once again, I'm sure there is something simple i'm missing but I can't figure out how to use data from Vehicle lua to run functions in GE lua. For example, using updateGFX to get a value such as airspeed and then when that value is more than 10 or whatever, run a function in GE lua. I searched around for anything relating to this but couldn't find any clear explanations on how to do what I want, thanks in advance for any help!



    Also on a sidenote, having trouble with lua triggers as well. I can get code to work when I input it into the function window in the world editor, but I can't figure out how to use this trigger to interact with my custom scripts.
     
  2. angelo234

    angelo234
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    Aug 11, 2017
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    Here's an example of how to call a GE Lua function from VE Lua, without and with parameters:
    Code:
    obj:queueGameEngineLua('your_func()')
    
    local x = 10
    obj:queueGameEngineLua('other_func('.. tostring(x) ..')')
    Could you give more info on what you're trying to do with the Lua triggers and FYI the Lua triggers run in the GE Lua environment.
     
  3. NuclearKnight

    NuclearKnight
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    Messages:
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    All I'm really trying to do with the trigger is have it call a function that is in my GE Lua script file that triggers
    So, I couldn't get the queueGameEngineLua working right. I made a simple function called "testScript()" in my lua script file in lua\ge\extensions\myscriptfile but when i try to call that function with the queueGameEngineLua it says "attempt to call nil value(or nil field i cant remember which but i can check later) testScript".
    '

    As for the triggers, all i really wanna do with that is to trigger a function that does a TriggerServerEvent for BeamMP but am unsure how to use the trigger to execute the code in my lua\ge\extensions\myscript file.

    Thanks for your help btw!
     
  4. NuclearKnight

    NuclearKnight
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    Yeah I've been trying to get this to work to no avail. To clarify on what I'm trying to do, right now I just want to get the vehicle z position and pass that over to a function in the GE environment that I have made. I can get the vehicle z position with no issues but when I try to queue my custom function it doesn't work and says "attempt to call field myfunction() a nil value".
    --- Post updated ---
    Code:
    local M = {}
    slowTime = 0
    local function updateGFX(dt)
        playerPos = obj:getPosition()
           posZ = playerPos.z
      
        slowTime = slowTime + dt
        
        
        if slowTime >= 1 then
          
      
                obj:queueGameEngineLua("testScript('tostring(posZ)')")
              
        print(playerPos.z)
        print(dt)
      
      
     
            
          
        slowTime = 0
    end
    end
    M.updateGFX = updateGFX
    return M
    
    This is the vehicle lua



    Code:
    M = {}
    playerID = nil
    local function testScript(posZ)
    print("Test", posZ )
     
    end
    
       
    M.testScript = testScript
    return M
    and the GE code


    This gives me an error: "attempt to call global testScript" (a nil value)
    However, if i replace my function with be:restVehicle() or similar it works
     
    #4 NuclearKnight, Jan 7, 2022
    Last edited: Jan 7, 2022
  5. angelo234

    angelo234
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    Messages:
    409
    Okay its because that function isn't in the global scope. There's a specific way to load in the GE Lua script too and I've attached a zip file containing how it should look like. Now that you've loaded in the script, the variable name of the Lua script is (derived from the file path "scripts\test_mod\extension.lua"):
    Code:
    scripts_test__mod_extension
    So in order to call the testScript function, you would call it like this:
    Code:
    scripts_test__mod_extension.testScript()
    And this is how you should call the testScript function from VE Lua (you want to resolve the posZ's value first and then concatenate it with the function call):
    Code:
    obj:queueGameEngineLua("scripts_test__mod_extension.testScript(" .. tostring(posZ) .. ")")
     

    Attached Files:

  6. NuclearKnight

    NuclearKnight
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    Joined:
    Nov 30, 2013
    Messages:
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    Ah yes that got rid of the error thanks for you help! Maybe I'll be able to finish what I'm doing now lol

    Actually I was wrong, still gives the same error. I'll keep messing around and try to get it to work.

    Well I was an idiot and named it "extensions" instead of just "extension" so its fixed now...
     
    #6 NuclearKnight, Jan 7, 2022
    Last edited: Jan 7, 2022
    • Like Like x 1
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