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Bepu Physics: MaxStepPerFrame does not bound steps per frame, and -1 stops the simulation from advancing

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@Nicogo1705 is already working on this.

Since Oct 7, 2026.

  • #3524 by @Nicogo1705 — open

Assessment

Difficulty
2/5
Estimated time
1-3 hours
Newbie friendliness
80/100
Issue type
Bug
Clarity
Clearly specified
Activity status
Active
Tech stack
csharp
Domain
game-dev

Research direction

Start at the loop in sources/engine/Stride.BepuPhysics/Stride.BepuPhysics/BepuSimulation.cs#L734 and check how its condition combines stepCount with MaxStepPerFrame. Verify the loop respects the configured limit and that -1 allows the simulation to advance.

Written by the indexing model from the issue text.

Description

bug

Release Type: GitHub

Version: 5cefe91c1a13d91154a696352147340ff6fb77fe

Describe the bug
sources/engine/Stride.BepuPhysics/Stride.BepuPhysics/BepuSimulation.cs#L734

for (int stepCount = 0; _remainingUpdateTime >= FixedTimeStep &&
     (stepCount < MaxStepPerFrame || MaxStepPerFrame != -1);
     stepCount++, _remainingUpdateTime -= FixedTimeStep)

Because MaxStepPerFrame does not change during the loop, the second operand
does not depend on stepCount, and the guard reduces to the value of
MaxStepPerFrame:

  • Any value other than -1 (including the default 3): MaxStepPerFrame != -1
    is true, so the guard is true for every stepCount. The number of steps taken
    in one Update call is not bounded by MaxStepPerFrame at all.
  • -1: stepCount < -1 is never true (stepCount starts at 0) and
    MaxStepPerFrame != -1 is false, so the loop body never executes and the
    simulation does not advance.
Dominant language
C#
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