Trail (trail / trail) is a technical term that is extremely important in rendering and optimizing game graphics (technical art). Explanation of the function that tracks the movement path of particles and moving objects and dynamically generates beautiful afterimages and flight trajectory polygons that flow behind them.
Real-world analogy: Trails of contrails left in the sky by airplanes
trail is "a contrail that appears naturally behind a plane and slowly fades and disappears over time". When an object (plane) moves, its coordinates (footprints) are automatically recorded, and a ribbon-like polygon sheet is stretched in real time to connect the coordinates. Older coordinates that have passed over time gradually become transparent and disappear, allowing you to express a beautiful ``reverberation of movement.''
Figure: An infographic that clearly illustrates the basic processing flow and mechanism of Trail (Trail / Trail) in Japanese notation
Detailed mechanism and operating principle
Use Unity's "Trail Renderer" component or enable Shuriken Particle System's "Trails" module to automatically crawl a strip mesh behind the movement path.