Camera Distance App

Debug app that displays the distance between the camera and the player vehicle.

Overview

ui_cameraDistanceApp is a simple debug extension that calculates and displays the distance between the camera and the player vehicle each frame.

Extension path: lua/ge/extensions/ui/cameraDistanceApp.lua

Exports (M)

Internals

Per-Frame Logic

local function onUpdate(dtReal, dtSim, dtRaw)
  local veh = getPlayerVehicle(0)
  if not veh then
    guihooks.trigger('cameraDistance', -1, "no vehicle")
    return
  end
  local vehPos = veh:getPosition()
  local camPos = core_camera.getPosition()

  -- Debug sphere at vehicle position
  debugDrawer:drawSphere(vehPos, 0.5, sphereColor)
  debugDrawer:drawTextAdvanced(vehPos, "camera distance target", textColor, true, false, textBackgroundColor)

  local distance = vehPos:distance(camPos)
  guihooks.trigger('cameraDistance', distance)
end

UI Communication

Sends distance via guihooks.trigger('cameraDistance', distance). When no vehicle exists, sends -1 with "no vehicle" message.

Debug Visualization

Draws a red sphere (radius 0.5) and text label at the vehicle position in 3D world space using debugDrawer.

How It Works

1. Each frame, gets player vehicle position and camera position
2. Calculates Euclidean distance between them
3. Triggers cameraDistance guihook with the value
4. Draws a debug sphere at the vehicle for visual reference

Additional Exports

The following exports are available but not yet documented in detail:

• M.onUpdate