From Spring

Debug Drawing Modes

Spring has several drawing modes which are useful for debugging and performance checking. They are listed below by UI commands with their default key binding.

/Debug (alt+b)


Draws a toggleable list of engine functions and a breakdown of how much time is spent computing them. When toggled on a line graph is drawn to illustrate the change in performance over time.

Since 97.0 there is a new Frame Grapher visualisation which shows how the last half-second was spent:

  • Green are video frames
  • Red are simframes
  • Blue is swapBuffer (gpu/vsync)
  • Pink is lua gc

/DebugColVol (alt+v)


Draws unit and feature collision volumes as purple meshes. When hit by a weapon the meshes turn red. Since 99.0 weapon debug spheres are also drawn in this mode for the AimFromWeapon() position, QueryWeapon() (muzzle) position and unit target position.

/DebugPath (alt+p)

/DebugPath Close up view
/DebugPath Far out view

Draws pathfinder routes, colour coded by accuracy.

  • Red is the most finely computed pathing
  • Green is intermediate paths
  • Blue is least accurate long range path


It is meant for debugging trajectories of ballistic projectiles. Currently broken in 98.0


/DebugDrawAI implemented in E232AI

This mode is toggled through the engine but is up to the native AI to implement itself. The image shows how E232AI implements a real-time threatmap rendering and a real-time performance profiler.