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‎cars_physics/turbo_map/README.md

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# Turbo with a LUT
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Instead of using gamma and reference RPM, this script allows turbos to use an RPM-boost LUT. Also includes original turbo implementation for reference.

‎cars_physics/turbo_map/script.lua

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local data = ac.accessCarPhysics()
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local engineINI = ac.INIConfig.carData(car.index, 'engine.ini')
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---Turbo acting similar to original Kunos turbo with CSP extensions. Only for illustrative purposes.
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---@return fun(dt: number)
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local DefaultTurbo = function (index)
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local section = 'TURBO_'..index
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local gamma = engineINI:get(section, 'GAMMA', 2)
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local rpmRef = engineINI:get(section, 'REFERENCE_RPM', 2000)
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local lagDown = engineINI:get(section, 'LAG_DN', 0.99)
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local lagUp = engineINI:get(section, 'LAG_UP', 0.99)
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local wastegate = engineINI:get(section, 'WASTEGATE', 0)
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local maxBoost = engineINI:get(section, 'MAX_BOOST', 1)
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local controllerMaxBoost = ac.getDynamicController('ctrl_turbo'..index..'.ini')
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local controllerWastegate = ac.getDynamicController('ctrl_wastegate'..index..'.ini')
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local gasCurve = engineINI:tryGetLut(section, 'EXT_GAS_CURVE')
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local spinDelay = engineINI:get(section, 'EXT_SPIN_DELAY', 0)
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local spinning = 0
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return function (dt)
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if controllerMaxBoost then
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maxBoost = controllerMaxBoost()
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end
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if controllerWastegate then
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wastegate = controllerWastegate()
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end
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local gas = data.gas
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if gasCurve then
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gas = gasCurve:get(gas)
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end
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local intensity = math.pow(math.saturateN(data.rpm * gas / rpmRef), gamma)
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spinning = spinning + (intensity - spinning) * (intensity > spinning and lagUp or lagDown) * dt
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if wastegate ~= 0 then
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local adjustedWastegate = wastegate * ac.getTurboUserWastegate(index)
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if maxBoost * spinning > adjustedWastegate then
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spinning = adjustedWastegate / maxBoost
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end
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end
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local finalBoost = maxBoost * (spinning * (1 + spinDelay) - spinDelay)
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ac.overrideTurboBoost(index, finalBoost)
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-- Of course final version shouldn’t have this debugging data printed:
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ac.debug('boost:'..index, finalBoost)
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end
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end
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---Turbo using LUTs instead of gamma and reference RPM. Based on:
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---https://docs.google.com/document/d/1uBc-bHx3yiR905IoTuWzJJIMKHdtDtz1mMplsrRbyzc
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---@return fun(dt: number)
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local MapTurbo = function (index)
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local section = 'TURBO_'..index
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local gamma = engineINI:get(section, 'GAMMA', 2)
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local rpmRef = engineINI:get(section, 'REFERENCE_RPM', 2000)
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local lagDown = engineINI:get(section, 'LAG_DN', 0.99)
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local lagUp = engineINI:get(section, 'LAG_UP', 0.99)
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local wastegate = engineINI:get(section, 'WASTEGATE', 0)
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local maxBoost = engineINI:get(section, 'MAX_BOOST', 1)
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local controllerWastegate = ac.getDynamicController('ctrl_wastegate'..index..'.ini')
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local gasCurve = engineINI:tryGetLut(section, 'EXT_GAS_CURVE')
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local spinDelay = engineINI:get(section, 'EXT_SPIN_DELAY', 0)
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local setupItem = ac.getScriptSetupValue('MAP_TURBO_'..index) or refnumber(0)
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local spinning = 0
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---@type ac.DataLUT11[]
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local mapNamesLut = engineINI:get(section, 'MAP_NAMES', '')
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local mapNames = {}
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if #mapNamesLut > 0 then
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local lut = ac.readDataFile(ac.getFolder(ac.FolderID.ContentCars)..'/'..ac.getCarID(car.index)..'/data/'..mapNamesLut)
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if lut and #lut > 0 then
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mapNames = table.map(table.map(lut:split('\n'), function (x)
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return x:split('|', 2, true)
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end), function (x)
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if #x ~= 2 then return end
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return x[1], tostring(x[2]) + 1
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end)
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end
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end
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local maps = {}
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for i = 0, 999 do
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local lut = engineINI:tryGetLut(section, 'MAP_'..i)
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if not lut then break end
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table.insert(maps, lut)
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end
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-- Silly trick for using user setting for switching between maps. First, set it to 100% (0 digit):
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ac.setTurboUserWastegate(index, 1)
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return function (dt)
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-- Continuing user setting trick here. Checking the current value:
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local currentUserSetting = ac.getTurboUserWastegate(index)
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if currentUserSetting ~= 1 then -- if it’s not 1, user changed it
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local selectedMap = math.round(currentUserSetting * 10) - 1 -- compute the new value based on whatever user has set
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ac.setTurboUserWastegate(index, 1) -- and reset it to 100%: this way default message wouldn’t be shown
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if maps[selectedMap + 1] then
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ac.setScriptSetupValue('MAP_TURBO_'..index, selectedMap)
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ac.setSystemMessage('Turbo', mapNames[selectedMap + 1] or ('Unnamed turbo map #'..(selectedMap + 1))) -- and we can add a custom message
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else
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ac.setSystemMessage('Turbo', 'No such map')
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end
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end
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local map = maps[setupItem() + 1]
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if not map then return end
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if map then
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maxBoost = map:get(data.rpm)
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end
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if controllerWastegate then
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wastegate = controllerWastegate()
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end
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local gas = data.gas
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if gasCurve then
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gas = gasCurve:get(gas)
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end
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local intensity = math.pow(math.saturateN(data.rpm * gas / rpmRef), gamma)
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spinning = spinning + (intensity - spinning) * (intensity > spinning and lagUp or lagDown) * dt
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if wastegate ~= 0 then
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local adjustedWastegate = wastegate * ac.getTurboUserWastegate(index)
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if maxBoost * spinning > adjustedWastegate then
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spinning = adjustedWastegate / maxBoost
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end
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end
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local finalBoost = maxBoost * (spinning * (1 + spinDelay) - spinDelay)
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ac.overrideTurboBoost(index, finalBoost)
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-- Of course final version shouldn’t have this debugging data printed:
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ac.debug('boost:'..index, finalBoost)
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ac.debug('setupItem():'..index, setupItem())
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-- ac.debug('setupItem.value:'..index, setupItem.value)
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end
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end
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local turbos = {}
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for i, section in engineINI:iterate('TURBO') do
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if engineINI:tryGetLut(section, 'MAP_0') then
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turbos[i] = MapTurbo(i - 1)
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else
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turbos[i] = DefaultTurbo(i - 1)
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end
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end
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function script.update(dt)
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for i = 1, #turbos do
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turbos[i](dt)
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end
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end

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