unity-texture-packer
                                
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                        Feature Suggestions
- Adding greyscale inverse can be useful for roughness <-> smoothness maps
- A color picker for creating a solid color channel.
- A label to hint the internal shader's channel representation. Or better, creating some preset with corresponding labels for that.
Thanks for the suggestion ! I also plan to turn this into a package for easier integration with latest versions (2019 and above)