Foliage atlas shows has edges when using mipmaps

Hello all,
I am experimenting importing speed tree files into unreal.

So this is the “Tree”…

The srt file does everthing automatically.
But the leaves on the tree has a very bright edge.

Only after I disable mipmap for its diffuse texture can I solve this problem.

Is that normal?

That happens because your masked texture probably uses a solid white colour as the background. You need to dilate the leafs on the masked texture so that it extends beyond the mask.

It’s because there’s no texture padding. Basically the green around the leaf texture should extend to the borders of the image. The mask/alpha does not need to change.

There are guides online using photoshop to pad textures using gaussian blur.