Texture Sheet Animation causes particles to be of an unexpected size.

Hello.

I'm using Texture Sheet Animation in Particle System (Shuriken), Unity version is 2019.4.12f1 (225e826a680e) Personal.

I hadn't been using Texture Sheet Animation, but I realized that SetPass was much more than I thought it would be. So I changed the texture from Standard to Sprite and used Sprite Atlas and Texture Sheet Animation, using the same material instead of a different one.

Then the particles were larger than their original size.

I think this is because when the texture became a sprite atlas, the completely transparent part of the perimeter was trimmed down and it was expanded from one end of the mesh to the other.

I realize that I can fix the problem by manually adjusting the size of the particles, but calculating them manually is a pain. Is there an approach that would automatically solve this problem?

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I know you can define 'slice' method in the legacy versions editor - https://docs.unity3d.com/Manual/TextureTypes.html#Sprite

for the new version check 'tight packing' - https://docs.unity3d.com/Manual/class-SpriteAtlas.html
try 'variant' and adjusting with 'scale' https://docs.unity3d.com/Manual/VariantSpriteAtlas.html

legacy version controls also define 'pixel per unit' - https://docs.unity3d.com/Manual/TextureTypes.html#Sprite
each sprite can be adjusted in the editor to define border size - https://docs.unity3d.com/Manual/SpriteEditor.html

 

Thank you Torbach78.

I changed the property

Mesh Type

in Sprite (2D and UI) from

Tight

to

Full Rect

and this issue has been resolved.

If I want to use sprites in Particle System instead of Sprite Renderer, I'll basically use Full Rect.

Using the Sprite Atlas property

Tight Packing

did not resolve this issue.