In this lesson, you will learn how to leverage console commands and built-in debug visualizers to inspect exactly where your Field System actors are exerting influence in your game world.
The Challenge of Invisible Forces
When you set up a Field System Actor to apply radial forces or fractures to a Geometry Collection, you are often manipulating invisible physics volumes. If your debris isn't reacting, or if fractures are triggering in the wrong location, you are essentially "flying blind." To fix this, you must rely on Unreal Engine’s internal physics visualization tools to bridge the gap between your intent and the physics engine's execution.
Enabling Physics Visualization
The most efficient way to see these invisible fields is via the console commands. During a Play-In-Editor (PIE) session, press the tilde (~) key and type:
p.Chaos.FieldSystem.ShowFields 1
Once enabled, Unreal Engine will render wireframe representations of your Field System actors directly in the viewport. You will see colored shapes corresponding to the bounds of your Radial Falloff, Box Falloff, or Plane Falloff fields.
If you need to dig deeper into how those fields are impacting the specific geometry, use:
p.Chaos.DebugDraw.Fracture 1
Analyzing Interactions
By activating these visualizers, you can perform real-time verification of your field setups:
- Overlap Validation: Ensure your field’s radius actually intersects the specific Geometry Collection clusters you intend to break.
- Falloff Verification: Observe the gradient of your falloff fields. If the "strength" of your field is dropping off too quickly, the visualization will show you exactly where the influence terminates relative to your mesh.
- Trigger Timing: By observing the shapes move in real-time, you can confirm if a dynamic field is reaching the target mesh at the exact frame your gameplay logic dictates.
Always remember to toggle these off (set to 0) once you have finished debugging, as they impose a performance cost on your render thread.
Key Takeaway: Use p.Chaos.FieldSystem.ShowFields 1 to instantly render your physics fields as wireframe volumes, allowing you to visually align forces and fractures with your Geometry Collections for precise, predictable destruction.