ChatGpt lua code for beamng

I was curious to see if chatgpt could make a lua code for beamng, so I inputted this, but it didn't seem to work in game. I don't know if it was something with chatgpt, beamng, or I'm just not knowledgeable with this stuff yet. I don't know.
Here’s what I entered:
in beamng.drive would it be possible to have a pitch lfo for engine sounds based on rpm and be able to set a certain amount of pitches in cents? For example, 0, -5, 0, -5, -5, 0, -5, 0, -5 to get a crossplane sound from a flatplane engine. And if so, where would I reference it here?

{ "etk_engine_i4_2.0": { "information":{ "authors":"BeamNG", "name":"2.0L I4 Engine", "value":4200, }, "slotType": "etk_engine", "slots": [ ["type", "default", "description"], ["etk_enginemounts","etk_enginemounts", "Engine Mounts", {"coreSlot"


}], ["etk_oilpan_i4","etk_oilpan_i4", "Oil Pan", {"coreSlot"

}], ["etk_intake_i4_2.0_petrol","etk_intake_i4_2.0_petrol_turbo", "Intake", {"coreSlot"

}], ["etk_exhaust_i4_2.0_petrol","etk_exhaust_i4_2.0_petrol", "Exhaust"], ["etk_engine_i4_2.0_ecu","etk_engine_i4_2.0_ecu_150", "Engine Management", {"coreSlot"

}], ["n2o_system","", "Nitrous Oxide System"], ["etk_engine_i4_2.0_internals","etk_engine_i4_2.0_internals", "Engine Long Block", {"coreSlot"

}], ["etk_transmission","etk_transmission_6M", "Transmission"], ], "powertrain": [ ["type", "name", "inputName", "inputIndex"], ["combustionEngine", "mainEngine", "dummy", 0], ], "mainEngine": { "torque":[ ["rpm", "torque"], [0, 0], [500, 135], [1000, 177], [2000, 214], [2500, 230], [3000, 233], [4000, 238], [4500, 235], [5000, 228], [6000, 212], [7000, 163], [7500, 150], ], "idleRPM":650, //max capable "maxRPM":7000, "inertia":0.10, "friction":14, "dynamicFriction":0.0239, "engineBrakeTorque":36, //"burnEfficiency":0.42, "burnEfficiency":[ [0, 0.12], [0.05, 0.28], [0.4, 0.51], [0.7, 0.48], [1, 0.34], ], //fuel system "energyStorage": "mainTank", "requiredEnergyType":"gasoline",


json
//exhaust
"instantAfterFireSound": "event:>Vehicle>Afterfire>i4_01>single",
"sustainedAfterFireSound": "event:>Vehicle>Afterfire>i4_01>multi",
"shiftAfterFireSound": "event:>Vehicle>Afterfire>i4_01>shift",
"particulates":0.015,
"instantAfterFireCoef": 0.25,
"sustainedAfterFireCoef": 0.1,
"afterFireAudibleThresholdShift":150000,
"instantAfterFireVolumeCoef": 0.6,
"sustainedAfterFireVolumeCoef": 0.3,
"shiftAfterFireVolumeCoef": 0.5,

//cooling and oil system,
"thermalsEnabled":true,
"engineBlockMaterial":"aluminum",
"engineBlockAirCoolingEfficiency":28,

//engine durability
"cylinderWallTemperatureDamageThreshold":150,
"headGasketDamageThreshold":1500000,
"pistonRingDamageThreshold":1500000,
"connectingRodDamageThreshold":2000000,
"maxTorqueRating": 430,
"maxOverTorqueDamage": 400,

//node beam interface
"torqueReactionNodes:":["e3r","e4r","e2l"],
"waterDamage": {"[engineGroup]:":["engine_intake"]},
"radiator": {"[engineGroup]:":["radiator"]},
"engineBlock": {"[engineGroup]:":["engine_block"]},
"breakTriggerBeam":"engine",
"uiName":"Engine",

"soundConfig": "soundConfig",
"soundConfigExhaust": "soundConfigExhaust",

//starter motor
"starterSample":"event:>Engine>Starter>i4_2009_eng",
"starterSampleExhaust":"event:>Engine>Starter>i4_2009_exh",
"shutOffSampleEngine":"event:>Engine>Shutoff>i4_2009_eng",
"shutOffSampleExhaust":"event:>Engine>Shutoff>i4_2009_exh",
"starterVolume":0.76,
"starterVolumeExhaust":0.76,
"shutOffVolumeEngine":0.76,
"shutOffVolumeExhaust":0.76,
"idleRPMStartRate":1.25,
"idleRPMStartCoef":1.2,

//engine deform groups
"deformGroups":["mainEngine", "mainEngine_intake", "mainEngine_accessories"]
},
"soundConfig": {
"sampleName": "I4_2_engine",
"intakeMuffling": 1,

"mainGain": -12.5,
"onLoadGain":1,
"offLoadGain":0.57,

"maxLoadMix": 0.73,
"minLoadMix": 0,

"lowShelfGain":3,
"lowShelfFreq":150,

"highShelfGain":4,
"highShelfFreq":7500,

"eqLowGain": 0,
"eqLowFreq": 120,
"eqLowWidth": 0.1,

"eqHighGain": 0,
"eqHighFreq": 500,
"eqHighWidth": 0.1,

"fundamentalFrequencyCylinderCount":4,
"eqFundamentalGain":0,
},
"soundConfigExhaust": {
"sampleName": "I4_2_exhaust",
"sampleSmoothingFactor": 0.3

"mainGain": 2.5,
"onLoadGain":1,
"offLoadGain":0.55

"maxLoadMix": 0.73,
"minLoadMix": 0,

"lowShelfGain":-12,
"lowShelfFreq":100,

"highShelfGain":7,
"highShelfFreq":4000,

"eqLowGain": 0,
"eqLowFreq": 120,
"eqLowWidth": 0.2,

"eqHighGain": 0,
"eqHighFreq": 4000,
"eqHighWidth": 0.1,

"fundamentalFrequencyCylinderCount":4,
"eqFundamentalGain": -2
},
"vehicleController": {
"clutchLaunchStartRPM":1500,
"clutchLaunchTargetRPM":2000,
//**highShiftDown can be overwritten by automatic transmissions**
"highShiftDownRPM":[0,0,0,2800,3800,4300,4700,4700],
//**highShiftUp can be overwritten by intake modifications**
"highShiftUpRPM":6800,
},

3/8
ChatGPT
To implement a pitch LFO (Low-Frequency Oscillator) for engine sounds in BeamNG.drive based on RPM and allowing for pitch modulation in cents, you'll need to:

1. Create a Lua script that handles the pitch modulation.
2. Modify your vehicle's JBeam file to reference the Lua script and ensure it integrates correctly with the engine sound system.

Step 1: Create the Lua Script
Here's a Lua script that adjusts engine sound pitch based on RPM and uses a sequence of pitch values in cents:

lua
-- File: pitch_lfo_cents.lua
-- This script modifies engine sound pitch in BeamNG.drive using an LFO and a sequence of pitch values in cents.

local M = {}

-- Function to convert cents to frequency ratio
local function centsToRatio(cents)
return 2^(cents / 1200)
end

-- Example: Define a sequence of pitch modulation values in cents
local pitchSequenceInCents = {0, -5, 0, -5, -5, 0, -5, 0, -5}
local sequenceLength = #pitchSequenceInCents

-- Calculate the corresponding frequency ratios for the pitch sequence
local pitchSequenceRatios = {}
for i, cents in ipairs(pitchSequenceInCents) do
table.insert(pitchSequenceRatios, centsToRatio(cents))
end

-- Function to update engine pitch based on RPM and LFO
local function updateEnginePitch(engine)
if engine then
local rpm = engine.rpm
local normalizedRpm = rpm / engine.maxRPM -- Normalize RPM to a 0-1 range

-- Calculate LFO value (oscillating between -1 and 1)
local lfoValue = math.sin(2 * math.pi * normalizedRpm)

-- Determine pitch index based on LFO value
local index = math.floor((lfoValue + 1) * (sequenceLength - 1) / 2) + 1
index = math.max(1, math.min(sequenceLength, index)) -- Ensure index is within bounds

-- Get the pitch ratio from the sequence
local pitchRatio = pitchSequenceRatios[index]

-- Set engine pitch to modified frequency
engine.sounds.mainSample:setPitch(pitchRatio)
end
end

-- Function called when the script initializes
local function onInit()
-- Initialize any necessary variables or resources here
print("Pitch LFO for engine sounds script initialized")
end

-- Function called on each simulation update
local function onUpdate()
local vehicle = be:getPlayerVehicle(0)
if vehicle then
local engine = vehicle.engine
updateEnginePitch(engine)
end
end

-- Hook functions to the vehicle's lifecycle events
M.onInit = onInit
M.onUpdate = onUpdate

return M

Step 2: Modify the JBeam File
Integrate the Lua script with your vehicle’s JBeam file. Here’s how you can modify your engine.jbeam file:

json
{
"etk_engine_i4_2.0": {
"information": {
"authors": "BeamNG",
"name": "2.0L I4 Engine",
"value": 4200
},
"slotType": "etk_engine",
"slots": [
["type", "default", "description"],
["etk_enginemounts", "etk_enginemounts", "Engine Mounts", {"coreSlot": true}],
["etk_oilpan_i4", "etk_oilpan_i4", "Oil Pan", {"coreSlot": true}],
["etk_intake_i4_2.0_petrol", "etk_intake_i4_2.0_petrol_turbo", "Intake", {"coreSlot": true}],
["etk_exhaust_i4_2.0_petrol", "etk_exhaust_i4_2.0_petrol", "Exhaust"],
["etk_engine_i4_2.0_ecu", "etk_engine_i4_2.0_ecu_150", "Engine Management", {"coreSlot": true}],
["n2o_system", "", "Nitrous Oxide System"],
["etk_engine_i4_2.0_internals", "etk_engine_i4_2.0_internals", "Engine Long Block", {"coreSlot": true}],
["etk_transmission", "etk_transmission_6M", "Transmission"]
],
"powertrain": [
["type", "name", "inputName", "inputIndex"],
["combustionEngine", "mainEngine", "dummy", 0]
],
"mainEngine": {
"torque": [
["rpm", "torque"],
[0, 0],
[500, 135],
[1000, 177],
[2000, 214],
[2500, 230],
[3000, 233],
[4000, 238],
[4500, 235],
[5000, 228],
[6000, 212],
[7000, 163],
[7500, 150]
],
"idleRPM": 650,
"maxRPM": 7000,
"inertia": 0.10,
"friction": 14,
"dynamicFriction": 0.0239,
"engineBrakeTorque": 36,
"burnEfficiency": [
[0, 0.12],
[0.05, 0.28],
[0.4, 0.51],
[0.7, 0.48],
[1, 0.34]
],
"energyStorage": "mainTank",
"requiredEnergyType": "gasoline",
"instantAfterFireSound": "event:>Vehicle>Afterfire>i4_01>single",
"sustainedAfterFireSound": "event:>Vehicle>Afterfire>i4_01>multi",
"shiftAfterFireSound": "event:>Vehicle>Afterfire>i4_01>shift",
"particulates": 0.015,
"instantAfterFireCoef": 0.25,
"sustainedAfterFireCoef": 0.1,
"afterFireAudibleThresholdShift": 150000,
"instantAfterFireVolumeCoef": 0.6,
"sustainedAfterFireVolumeCoef": 0.3,
"shiftAfterFireVolumeCoef": 0.5,
"thermalsEnabled": true,
"engineBlockMaterial": "aluminum",
"engineBlockAirCoolingEfficiency": 28,
"cylinderWallTemperatureDamageThreshold": 150,
"headGasketDamageThreshold": 1500000,
"pistonRingDamageThreshold": 1500000,
"connectingRodDamageThreshold": 2000000,
"maxTorqueRating": 430,
"maxOverTorqueDamage": 400,
"torqueReactionNodes:": ["e3r", "e4r", "e2l"],
"waterDamage": {"[engineGroup]:": ["engine_intake"]},
"radiator": {"[engineGroup]:": ["radiator"]},
"engineBlock": {"[engineGroup]:": ["engine_block"]},
"breakTriggerBeam": "engine",
"uiName": "Engine",
"soundConfig": "soundConfig",
"soundConfigExhaust": "soundConfigExhaust",
"starterSample": "event:>Engine>Starter>i4_2009_eng",
"starterSampleExhaust": "event:>Engine>Starter>i4_2009_exh",
"shutOffSampleEngine": "event:>Engine>Shutoff>i4_2009_eng",
"shutOffSampleExhaust": "event:>Engine>Shutoff>i4_2009_exh",
"starterVolume": 0.76,
"starterVolumeExhaust": 0.76,
"shutOffVolumeEngine": 0.76,
"shutOffVolumeExhaust": 0.76,
"idleRPMStartRate": 1.25,
"idleRPMStartCoef": 1.2,
"deformGroups": ["mainEngine", "mainEngine_intake", "mainEngine_accessories"]
},
"soundConfig": {
"sampleName": "I4_2_engine",
"intakeMuffling": 1,
"mainGain": -12.5,
"onLoadGain": 1,
"offLoadGain": 0.57,
"maxLoadMix": 0.73,
"minLoadMix": 0,
"lowShelfGain": 3,
"lowShelfFreq": 150,
"highShelfGain": 4,
"highShelfFreq": 7500,
"eqLowGain": 0,
"eqLowFreq": 120,
"eqLowWidth": 0.1,
"eqHighGain": 0,
"eqHighFreq": 500,
"eqHighWidth": 0.1,
"fundamentalFrequencyCylinderCount": 4,
"eqFundamentalGain": 0
},
"soundConfigExhaust": {
"sampleName": "I4_2_exhaust",
"sampleSmoothingFactor": 0.3,
"mainGain": 2.5,
"onLoadGain": 1,
"offLoadGain": 0.55,
"maxLoadMix": 0.73,
"minLoadMix": 0,
"lowShelfGain": -12,
"lowShelfFreq": 100,
"highShelfGain": 7,
"highShelfFreq": 4000,
"eqLowGain": 0,
"eqLowFreq": 120,
"eqLowWidth": 0.2,
"eqHighGain": 0,
"eqHighFreq": 4000,
"eqHighWidth": 0.1,
"fundamentalFrequencyCylinderCount": 4,
"eqFundamentalGain": -2
},
"vehicleController": {
"clutchLaunchStartRPM": 1500,
"clutchLaunchTargetRPM": 2000,
"highShiftDownRPM": [0, 0, 0, 2800, 3800, 4300, 4700, 4700],
"highShiftUpRPM": 6800
},
"lua": {
"controller": "vehicles/your_vehicle/lua/pitch_lfo_cents.lua"
}
}
}

Explanation

• Lua Script: Save the Lua script as pitch_lfo_cents.lua in the appropriate directory (e.g., vehicles/your_vehicle/lua/).
• JBeam Modification: Add the "lua": { "controller": "vehicles/your_vehicle/lua/pitch_lfo_cents.lua" } line to your engine configuration in the JBeam file. This line references the Lua script to ensure it is executed for the engine sounds.

Testing

1. Save all changes: Ensure your Lua script and JBeam file are correctly saved in the respective directories.
2. Load the vehicle: Start BeamNG.drive, select your vehicle, and listen for the pitch changes as the RPM varies.

This setup allows for dynamic pitch modulation based on RPM, using a sequence of pitch values in cents to achieve a desired engine sound effect. Adjust the pitchSequenceInCents array in the Lua script to fine-tune the sound to your liking.

 

Would something like this actually be possible in-game?

 

Because it would definitely give more variety to the engine sounds

 

Who would know if lua can access fmod?