Do these 3 things before closing this tab:
1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitchesTo prevent a fruit from merging twice, accept a matching collision only once: verify both fruits are eligible, mark both as merging immediately, and only then schedule removal, create the successor, and apply score or effects. This makes the merge a single transaction instead of a side effect that can run again when another collision callback arrives.
Why a single collision can produce duplicate merges
Physics engines may report contact through multiple callbacks or callback paths. If the game waits until deferred cleanup to mark a fruit as consumed, another callback can claim the same fruit first. The results can include two successor fruits, duplicate score or sound, and old fruit bodies that remain active after their artwork disappears.
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The specific event name and callback behavior depend on the engine. A Matter.js teaching example uses collisionStart; a Defold forum discussion focuses on collision groups and masks; and a melonJS adapter note describes a legacy dynamic-pair behavior that can call back twice per frame. That melonJS behavior is not a general rule for Matter.js or other engines.
Use one guarded merge transaction
- Validate the pair. Reject contacts that are not between fruit, whose types do not match, or whose bodies are already merging or consumed. For example, the cited Matter.js tutorial checks the fruit label and matching fruit index.
- Claim both bodies synchronously. Set each source body’s merging or consumed state before queuing animation, removal, spawning, score, or sound. The second callback must see that claim and exit. The Matter.js example sets both
bodyA.mergingandbodyB.mergingbefore scheduling removal and creating the next fruit. - Capture the merge data. Save the successor type and spawn position from the accepted pair before destroying or mutating either body. This also avoids deferred work relying on values that may change.
- Defer world changes only when the engine requires it. Some physics APIs require body additions or removals at a safe point. Use the timing rules for your engine; do not copy another engine’s delay as if it were universal.
- Retire both sources completely. Remove their physics bodies and game-side references, including entries in any parallel entity or fruit collections, then add exactly one successor.
- Commit effects once. Award score and trigger sound or visual effects from the accepted merge event, not from separate callbacks. Keep the consumed state in force until the old bodies can no longer receive gameplay callbacks.
A useful invariant is: one accepted pair produces one successor and one set of side effects, while each source becomes unavailable as soon as the pair is accepted.
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Choose guards that match the callback problem
| Guard | What it prevents | Tradeoff |
|---|---|---|
Per-body merging or consumed state |
A fruit being claimed again while cleanup is pending, including by a different simultaneous pair. | Set it before asynchronous work begins, and do not clear it while the source can still receive gameplay callbacks. This pattern is shown in the Matter.js tutorial: HinaTech Games’ Matter.js fruit-merge tutorial. |
| Canonical pair key using stable entity IDs | The same pair being processed through multiple callback paths. | It does not stop one fruit from being claimed by two different pairs, so retain per-body consumed state as well. This is an implementation option for the repeated-callback risk, not a benchmarked alternative. |
| Callback-side or orientation filter | Repeated handling in an engine with documented two-sided or revisited-pair callbacks. | Engine-specific; an incorrect orientation assumption can suppress a legitimate event. A legacy melonJS adapter note describes such a case and distinguishes it from Matter.js: melonJS issue 963. |
Choose based on the engine’s callback contract, whether more than one handler can process a pair, protection against multi-pair claims, and how clearly cleanup is represented. No one guard is established as universally fastest or best.
Represent fruit identity reliably
A collision filter can establish whether an object belongs to a fruit category, but the game still needs a reliable way to compare fruit types. In Defold, the cited discussion describes using collision groups and masks or checking the reported other group; the merge logic should distinguish “is a fruit” from “is the same fruit type.” See the Defold fruit-merging discussion for that engine-specific context.
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Diagnose the duplicate before changing physics settings
Log stable IDs for both bodies, their type or index, the callback phase, and each body’s merge state before mutation. Also count accepted merge commits, successor bodies created, and source bodies removed.
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- If one commit creates multiple successors, check whether more than one handler invokes creation or whether deferred callbacks captured mutable data.
- If fruit artwork vanishes but contacts continue, check that the physics bodies left the world and that game-side collections no longer retain the consumed entities.
These checks distinguish duplicate event delivery from duplicate transaction execution and from incomplete cleanup; they do not require changing collision response or tuning the physics simulation.
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Engine-specific details matter
The Matter.js example filters by label and matching fruit index, marks both bodies as merging, then schedules removal and successor creation. Defold’s discussion illustrates collision-group filtering. The melonJS adapter note concerns a distinct legacy callback behavior, so an orientation workaround from that context should not be applied blindly elsewhere. Confirm the event contract and safe mutation timing in the documentation for the engine and version your game actually uses.
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