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Breaks

mlody.lew

Hi
What to do in the settings so that there are no such breaks?

I have such settings. I tried different variants.

mlody.lew

Mario

Try the Permultiplied alpha setting. What runtime are you using? In some cases, you have to manually enable premultiplied alpha.

mlody.lew

The alpha premultippel creates white stripes so I can not use it. The only solution I found was to change Rutime to nearest . It's a bit pixel-like but it looks pretty good on the phone. Is there a better way?

Harald

You could examine the RGB channels at the transparency-border of your input-images and check if it contains the same color as the opaque part, just with transparent alpha value.

Unfortunately Photoshop (or at least my old CS5.5 version) hides the true RGB values at png files in the channels view, Gimp does however show the content of the png file correctly.

If the input image contains white RGB values there, then it is wrong and I recommend re-exporting the input image.
If it contains dark values there, then maybe it has already been saved with a "premultiplied alpha" setting, which ends up twice-pre-multiplied (black) if you again check the box in the atlas export settings. Then you could uncheck the "premultiplied alpha" setting in the atlas export but still have the "straight alpha" setting disabled at your Material in the engine you use.

Mario

What runtime are you using? Pre-multiplied alpha should fix the issue you are seeing. As I said, you might have to enable pre-multiplied alpha programmatically in the runtime.

Harald

In case you are still encountering artifacts at borders: Please see this forum thread here, where we just discovered that with mipmaps enabled, Unity's default settings generate incorrect mipmaps on premultiplied-alpha atlas assets, leading to incorrect borders:

Mipmap issue and General Unity Downscaling Question