What steps will reproduce the problem? 1. Create an AtlasSpriteManager in a layer 2. Get two AtlasSprites from the manager 3. Position the two sprites 4. Set the opacity of the second sprite to some value like 50

What is the expected output? What do you see instead?

The second AtlasSprite should be painted with the specified opacity

but just a part of the first sprite changes it's opacity

A Texture in TextureAtlas need four colors for four vertices

Yes, that fixed it. Thanks