Create texture atlas from several pngs

Unity Engine
1

so far all examples I found about texture atlas assumes I have one png with several sprite art on it and slice them up inside unity3d.

I want to do the opposite, I have all individual png files one for each sprite and I want to create one texture atlas in unity3d with them

any tips?

2

If you have Unity Pro, assign all the files the same packing tag, and it’s done automatically.

–Eric

3

or if you don’t have Unity Pro, you can create texture atlas in Photoshop, Gimp, or etc graphical apps. and after that slice them in Unity,

4

Do any of these work?

Or if you don’t have Unity Pro - Glueit is a nice free minimalistic tool.