particles emit crash unity

Unity Engine
1

hi all!
I’ve got an issue with unity 2017.2, so I decided to reinstall unity 2017.1 that worked well before today, and now the game crash when I emit the particles:
here is my code:

ParticleSystem m_particles;
ParticleSystem.EmitParams m_emitParams = new ParticleSystem.EmitParams();

void OnEnable()
{
    m_particles = GetComponent<ParticleSystem>();
    m_particles.Stop();
}

public void Emit()
{
    m_emitParams.position = position;
    m_emitParams.rotation = rotation;

    m_emitParams.startLifetime = lifetime;
    m_emitParams.startSize = size;
    m_emitParams.startColor = color;
    m_emitParams.randomSeed = randomSeed;

    m_particles.Emit(m_emitParams, 1);
}

when I call m_particles.Emit function unity creates an access violation…
I tried to put the function under try catch but no glue… ctd always

thanks in advance

2

Can you share crash dumps and log files?

It sounds like this issue Unity Issue Tracker - Unity crashes when emitting particles from script and using a Size module, if system has not been updated yet

Did you open your 2017.2 project with 2017.1 or reopen a backup? We do not support downgrading versions so its possible that something was updated in 2017.2 and is not supported in 2017.1.
Do you have a 2017.1 version of the project?

3

hi @karl_jones
seems like the issue you linked…
here is the dump, built checkout a previuos version, built with 2017.1

but a question: it’s ok that unity doesn’t support downgrade, but for example, when I upgraded to 2017.2, the only scripts changed were about the VR, that changed the Class to XR… if I go back correcting the errors, is not a good downgrade? also I removed the library and obj is not ok?

thanks in advance

3255308–250772–Crash_2017-10-16_153148.rar (29.8 KB)

4

Can you share gRallySim.exe that was used to generate the dmp?
Its not really the scripts that are a problem with downgrading but more the various asset files. If you have made a change and saved in 2017.2 then the related asset files(prefabs, scenes etc) will have been updated to the 2017.2 format which may have changed some properties/data types etc. Downgrading to 2017.1 can then cause issues as it has no understanding of newer versions and so can cause all sorts of issues. Particles have had quite a few changes so there is a good chance that this is what is happening.

5

thanks @karl_jones for your interest… I’m trying to create a little project with only this thing…
p.s. I’ve tried with an empty project downloading edy vehicle (like in the bug above) and it crashes like mine…

6

Sounds like a different issue then. Can you file a bug report with the small project that has the same issue?

7

thanks @karl_jones !
here is the example… I tried to add in the bug error but I’ve got some web issues…

3255487–250796–ParticleIssue.rar (39.8 KB)