Particle doesn't start to scale at birth

Development Asset Creation FX
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1

I have created a simple particle system that should spawn a circle and then scale it up and disappear.
I have that working but with a small problem, particle does not begin to scale at spawn.
particle spawns, stays at initial spawn size for some moments (half a second I believe) and then it finally scales up as desired.

https://dl.dropboxusercontent.com/u/10682768/particlesystemcircles.gif

Emitter loop count is 1
Added 1 element to Burst List
Lifetime is 1
Added 2 points to Size Scale: 0.0/[1.0,1.0,1.0] , 1.0/[5.0,5.0,5.0]

2

Hey ,

I wasn’t able to reproduce issue you had when making a new particle system. Can you tell us your repro steps with as much detail as you can, including which Modules you have in your emitter? Thanks!

3

Hey, sure no problem!

I only have one particle emitter with following non-default values:

Required:
Emitter:

  • Kill on completed = true
  • Use legacy Emitter Time = false

Duration:

  • Emitter Loops = 1

Spawn:
Rate

  • Distribution:
    RequiredDistributionSpawnRate
  • Constant: 1.0

Rate Scale

  • Distribution:
    RequiredDistributionSpawnRateScale
  • Constant: 1.0

Burst:

  • Burst List: 1 element
  • Count 1
  • Count Low -1
  • Time 0.0

Burst Scale

  • Distribution: BurstScaleDistribution
  • Constant : 1.0

Lifetime:
Distribution: DistributionFloatConstant_0
Constant: 1.0

Initial Size:
Start Size

  • Distribution:
    DistributionVectorConstant_1
  • Constant: 30.0, 30.0, 30.0

Size Scale:

  • Distribution:
    DistributionVectorConstantCurve_4

  • Points elements = 2

  • Point 1 - InVal = 0.0 - OutVal = 1.0,
    1.0, 1.0

  • Point 2 - InVal = 1.0 - OutVal =
    5.0,5.0,5.0

  • Points Interpolation are both:
    CIM_Linear

Lock Axis:

  • Orientation: EPAL_Z

Particle Material:

Blend Mode is set to Translucent
Lighting model to Unlit

Usage is checked for Particle Sprite and Mesh Particle.

Thank you!

4

Have you tried using a Size by Life module instead of a Size Scale?

5

I did.
Ok I found a solution for problem.
I just needed to change InVal value of first point for SizeScale or Size By Life from 0.0 to -1.0

I’m not sure why it requires a value less than 0, shouldn’t InVal correspond to lifetime of particle system?

6

It should, yes. That is strange, mine worked fine at 0.0. Glad you were able to get it working, though!

7

Found out what real problem was!
I had to change following values for Spawn:
Rate Constant from 1 to 0
Rate Scale Constant from 1 to 0

This way it doesn’t mess up with burst system which is set to 1 element with 1 particle at time 0

Now Size by Life works fine with value 0.

All my mistake :slight_smile:

Thanks!