Trying to extract the trajectory ball from the AIControl app to a standalone UI app

Edit: That trajectory ball that you want to draw can only come from AI data as that is what the AI calculated where it wants to go to.

The code that draws the trajectory of the AI is located in BeamNG.drive\lua\vehicle\ai.lua and not in the app code, and so the app code calls functions from ai.lua. Here is the code (line 2171)

Code:

-- Debug Throttle brake application
trajecRec = {last = 0} -- place this as a global variable

local maxLen = 175
local len = min(#trajecRec, maxLen)
local last = trajecRec.last
if len == 0 or (trajecRec[last][1] - aiPos:toFloat3()):length() > 0.25 then
[INDENT]last = 1 + last % maxLen
trajecRec[last] = {aiPos:toFloat3(), lastCommand.throttle, lastCommand.brake}
len = min(len+1, maxLen)
trajecRec.last = last[/INDENT]
end

local fl3 = float3(0.7, aiWidth, 0.7)
for i = 1, len-1 do
[INDENT]local n = trajecRec[1+(last+i)%len]
debugDrawer:drawSquarePrism(trajecRec[1+(last+i-1)%len][1], n[1], fl3, fl3, color(255*sqrt(abs(n[3])), 255*sqrt(n[2]), 0, 100))[/INDENT]
end

You wouldn't be able to copy and paste this straight into a Lua file and expect it to work for your own non-AI vehicle though, since some of the functions only work with the AI. For example, you would need to change "aiPos:toFloat3()" to "obj:getFrontPosition()". The "lastCommand.throttle" and "lastCommand.brake" need to be changed to "electrics.values.throttle" and "electrics.values.brake" respectively. So here's my modified version of this to make it work:

Code:

local M = {}

local max = math.max
local min = math.min
local sin = math.sin
local asin = math.asin
local pi = math.pi
local abs = math.abs
local sqrt = math.sqrt
local floor = math.floor
local tableInsert = table.insert
local tableRemove = table.remove
local strFormat = string.format

local trajecRec = {last = 0}

local function updateGFX(dt)
    local debugDrawer = obj.debugDrawProxy
  
    local pos = (vec3(obj:getFrontPosition()) - vec3(0,0,0.8)):toFloat3()
    local maxLen = 175
    local len = min(#trajecRec, maxLen)
    local last = trajecRec.last
    if len == 0 or (trajecRec[last][1] - pos):length() > 0.25 then
        last = 1 + last % maxLen
        trajecRec[last] = {pos, electrics.values.throttle, electrics.values.brake}
        len = min(len+1, maxLen)
        trajecRec.last = last
    end

    local width = 2

    local fl3 = float3(0.7, width, 0.7)
    for i = 1, len-1 do
        local n = trajecRec[1+(last+i)%len]
        debugDrawer:drawSquarePrism(trajecRec[1+(last+i-1)%len][1], n[1], fl3, fl3, color(255*sqrt(abs(n[3])), 255*sqrt(n[2]), 0, 100))
    end
end

M.updateGFX = updateGFX
 
return M

So paste this code into an empty Lua file and name it whatever. Then stick this file in your mod directory "mods\unpacked\your_mod_name\vehicles\etk800\lua" (this only shows trajectories for the etk800 vehicle and I'm not sure how to apply this to all without copying and pasting this file to all the vehicle folders) You won't need to call anything from other files to see this in action. Hope this helps

 

Lol at first I didn't know what "trajectory" ball you were talking about since it was being hidden by the car from my viewing perspective so I just assumed you were talking about the trajectory boxes/lines. But later I looked around more and saw it was right in front of the car and I just facepalmed since I could have easily answered your question.