Simulation Space

Simulation Space (Simulation Space) is a technical term that is extremely important in the rendering and optimization of game graphics (technical art). In a particle system, a setting that determines whether the particle behavior and coordinate calculations are based on the parent game object (Local) or the scene's world space (World).

Real world analogy: Physics of whether garbage thrown out of the window of a moving train will "stick to the train and run parallel to it (Local)" or "fall on the spot (World)" in the air

Simulation Space is ``Physical settings for the behavior when garbage (particles) are thrown out of the window of a fast-moving train''. If the setting is "Local", the thrown garbage will stand still in the air next to the train and continue running parallel to the train at the same speed as the train (very unnatural behavior). When set to "World", the garbage will be left floating at the GPS coordinates (world position) at the moment it was thrown away, and only the train will move away. This is the natural physical phenomenon of smoke and sparks floating in the wind.

Detailed mechanism and operating principle

Simulation Change the Space setting to "World" to create a natural exhaust/trajectory effect where once the particles are generated, they are completely freed from the movement of the parent object and remain statically left in the world coordinate space of the scene.