Turn particle polish into a visual acceptance contract

An artist has the power to reject an effect that passes all code checks, but the timing and visual aspects require a separate evaluation. The tutorial introduces an acceptance contract for a coin pickup effect, focusing on the visual decision rather than the specific tools used. To create this contract, an approved reference is defined, including the revision, viewport, camera, background, and timing of the pickup event.

The artist should review and approve this reference before execution. The contract outlines specific timing requirements for the pickup effect, such as the ring appearing at 80 milliseconds, reaching maximum radius at 240 milliseconds, and disappearing at 600 milliseconds. The artist must approve these timings before proceeding.

The technical brief is written separately, detailing the required changes, such as adjusting the pickup ring timing and opacity while preserving the coin award logic and event count. The review process involves engineering, art, and technical reviewers, with the artist ultimately approving the visual result. The capture process should be repeatable, using a fixed trigger, camera, and initial state.

If the effect is randomized, a seed should be recorded. The review scene should have an adapter contract for capturing frames at specific time intervals. The contract can be documented in a repository issue, serving as a reference and decision record. However, it is important to note that still frames cannot prove smooth motion, and a short clip should be added for temporal judgment.

Performance and synthesis review are separate considerations, and the artist's sign-off only ensures the scoped visual request is acceptable under the recorded conditions.