What causes fast objects passing through trigger volumes undetected?

Trigger overlap is tested only at discrete physics frames, so a body moving far enough in one step is on both sides of a thin trigger without ever overlapping it on a sampled frame.

How do I catch this when it only happens for some players?

Capture it automatically from the player's device with the full stack trace, the device and OS, the build, and a breadcrumb trail of what they did. That turns a vague complaint into a specific, reproducible issue you can fix without owning the hardware it happens on.

How to Fix Fast Objects Passing Through Trigger Volumes Undetected

Quick answer: Make the moving body continuous-detection, thicken the trigger, or sweep a raycast/overlap between last and current position so the crossing is always registered.

A bullet that should arm a tripwire or a dash that should enter a zone sometimes just skips it. Triggers are sampled per frame, and a fast body can tunnel through a thin one between samples. Here is how to fix it.

How to fix it

1. Enable continuous detection

Set the moving rigidbody's collisionDetectionMode to Continuous (or Continuous Dynamic) so the engine sweeps its path and catches thin trigger crossings between frames.

2. Thicken the trigger volume

Make the trigger collider deeper along the travel direction so even a fast body overlaps it on at least one physics frame; a paper-thin trigger is the most fragile.

3. Sweep-test the movement

For very fast objects, cast a ray or use Physics.OverlapCapsule from last frame's position to this frame's and treat any hit as having entered the zone, independent of the trigger callback.

Catching the ones you can't reproduce

The hardest version of this to fix is the one you can't reproduce — it only happens on a player's hardware, OS, driver, or save state, under conditions that simply aren't present on your machine. A report that says “it crashed” or “it froze” gives you nothing to act on, so the bug survives release after release while quietly costing you players.

Automatic error capture closes that gap. Each failure arrives with its full stack trace, the device and OS, the build number, and a breadcrumb trail of what the player did right before it broke, so even a failure you have never seen becomes a specific, reproducible issue. Fold identical failures into one signature ranked by how many players each hits, and your worklist sorts itself worst-first instead of arriving as a stream of vague complaints.

This is where a tool like Bugnet earns its place. Its SDK captures every Unity error automatically with the full stack trace plus device, OS, memory, build, and game-state context, folds duplicates into one grouped issue with an occurrence count, and ties each to the build it first appeared on — so you fix the problem that hurts the most players first and confirm it is gone when its signature disappears from the next release.

Reproduce it once with full context and the fix writes itself. The hunt is the expensive part.