Do Particle Systems render sprites at a different scale?

Heyo!

So my repro is pretty simple here. I have an object that has a sprite renderer and an animator. I also have a script attached attached that feeds the spriterenderer.sprite to a particle system. The particle is set to emit using texture sheet animation, using only 1 sprite reference ever (which keeps getting hot swapped out at runtime with the aforementioned script).

Now the problem I'm seeing is that the emitted sprite is distorted in its scale. What i've highlighted in red are eye-balled adjustments i had to make to the start size of the particles so that they match the same size as what the sprite renderer shows.

So simply put, why would the particle system (despite having a (1,1,1) scale on both the object and the start size param in the particle system) render the exact same sprite a different scale than what the sprite renderer would show?

 

Hey @richardkettlewell ! Thanks for the quick reply.

So I did some testing in a brand new project (2019.3.1f1) and it turns out that the Pixels Per Unit (PPU) property has no effect on the particle rendering (while it does on the sprite renderer). Check out this simple repro project with the sample scene i made. Just simply select the particle system to preview it rendering the sprite above the sprite renderer.

The sizes are different. You can adjust the PPU but the particle system wont respond to it.

Repro Project:
https://drive.google.com/file/d/17_RO5mlxT8HRHjBJKnRvmBLzvPpa3hd5/view?usp=sharing

 

Thanks @richardkettlewell,

I've went ahead and filed the bug.

Thanks again for your help, I very much appreciate it

 

@richardkettlewell Its filed as Case 1249923

 

**Necromancy**

Any updates on this?
I just ran into the same issue, PPU does not affect particle sprites in any way, so sprites I try to emit as particles have different sizes than their regular GameObject counterparts.

I couldn't find this issue on the tracker by ID with the Search function

 

Thanks for the quick reply! Perfectly understandable, I'll go the custom script route

This seems to have worked for me. Apparently the particle size is calculated based on sprite width.
I'm not sure the result is 100% accurate, but it cerainly is close enough.

Code (CSharp):

1.  
2. var main = particles.main;
3. main.startSize = new ParticleSystem.MinMaxCurve(ItemSprite.rect.width/ItemSprite.pixelsPerUnit);