Sprite Atlas always creates a texture with alpha, even if none of the source sprites doesn't have.

Unity Engine
1

After seeing that Sprite Packer is now legacy, I tried Sprite Alpha feature and set up almost all the UI with it.

However, Sprite Asset is missing a feature that the old system had.

We have lots of non-transparent UI sprites. Mostly for tutorial screenshots and etc. To save space I added these to a separate sprite atlas just because they don’t have alpha. But Sprite Asset packing doesn’t realize that and creates a texture with alpha instead. And I couldn’t find an option to pack non-transparent.

I know the Override buttons would work but it’s a complicated workaround to set up texture format for all the platforms we would support, I usually just select compression quality and leave the rest to unity, and I don’t know which one is more suitable for a UI sprite.
And those overrides get removed for example if the file is modified with for example a PC without Unity Android Support installed.

I attached an image below.

Is there an easier workaround for this?

Unity 2017.4.24f1

4490515--413770--upload_2019-5-1_19-51-48.png
4490515--413770--upload_2019-5-1_19-51-48.png744×803 163 KB

1 Like
2

Hi, @Meceka . I was wondering if you ever solved this issue?

3

Hi @unity_cderochie

No, I gave up creating a sprite atlas for these or similar sprites because of this problem.

It means game will run slightly less optimized. They will not batch and as far as I know, there is a small cost of having multiple separate textures rather than one atlas for GPU as well.

If there is no alpha in the imported source textures (For example RGB Compressed something), should create a texture atlas also without alpha.