How do I accelerate particles in Shuriken?

I’d like to create a burst effect that starts slowly but explodes quickly, but I haven’t found anything that can change the speed over time…

I tried these things, and none of them works:

  1. Velocity over Lifetime: this module messes up the direction of the burst.
  2. Limit Velocity over Lifetime: as it says, it only limits the velocity but never increase it. This works perfect with slowing, how about the opposite?
  3. Force over Lifetime: this also messes up the direction.
  4. Change start speed to curve instead of a constant: I cannot see the reason why it can be curve. Apparently this only sets the initial speed, and only the first point of the curve matters.

Did I miss anything? Or it’s just impossible to set the speed of particles?

I would develop your own behavior to put on your particle system. Use the :

ParticleSystem.Particle[] particles = new ParticleSystem.Particle[particleSystem.particleCount];
particleSystem.GetParticles(particles);

Now you have an array of every particle in the system. Each particle if you iterate through it can be individually changed:

for(int p = 0; p < particles.Length; p++)
{
    ParticleSystem.Particle part = particles[p];
    //now you can adjust anything
    //part.velocity is going to be what you want but there are other adjustments to be
    //made check out https://docs.unity3d.com/Documentation/ScriptReference/ParticleSystem.Particle.html

    //update your array with the updated particle
    particles[p] = part;
}

//set your array back to the particleSystem
particleSystem.SetParticles(particles, particles.Length);

Let me know if you have any questions about this or if this is not what you are looking for.