Particle system emit with single frame delay

Hi everyone,

it seems that particle systems emit their first particle one frame after activation, i.e., with a delay of one "Fixed Timestep". This makes it hard to synchronize particle systems with other timing sensitive animations. I was wondering if this is intentional and whether it is possible to make particle systems emit on the first frame instead. I would expect this to be the default, because I can setup a burst emission at time 0, which is explicitly not delayed by one frame.

To visualize the problem, I have created a particle system that emits one particle with speed one and a sphere that is moved by an Animator at the same speed for reference. Particle and Sphere should be always perfectly aligned. However, they are offset with a distance corresponding to the configured fixed timestep. It becomes very apparent when increasing the fixed timestep.

Thanks!

 

same question

 

Ah, sorry I left this pending!`
I actually reported a bug back then and it was claimed to be fixed in Unity 2022.1.0a10 and above.
https://fogbugz.unity3d.com/default.asp?1352736_bto92e6pcvis0ac0

I was talking about burst emissions. It used to be that a burst configured for t=0 was actually only emitted after one FixedTimeframe period had passed.