when set Warmup Time to 0.f, Particle would appear with 1 second delay; when set Warmup Time to 1.f, Particle would appear immediately with no delay, why would this happen?
warm up time basically means how long the particle system is simulating before being rendered. If you have particles that spawn 1 second after the emitter starts, but the warm up time is 1 second, the particles will spawn immediately because according to emitter time 1 second has passed
Thx for your reply! I see