Unity project for a tool that convert PBR textures between Roughness and Standard for Unity shaders
Unity 2018.3 or more (the script should work on lower version, but the minimum version I used was that one)
The app has been tested on OSX and Windows 10.
On application start, you can select the list of texture you want to convert with the button on the left.
When all textures have been selected, you can of course clear the list, to start a new selection if needed.
When the textures have been selected, you should select the naming scheme of the textures. The names used in the industry are usually suffixes, like '-diffuse', or '_normal', or '_D', '_N'... For the moment, only 'full names' for the suffixes are used.
You then choose the order you will follow for the conversion. You can go from 'Standard' to 'Roughness' or from 'Roughness' to 'Standard'. (For the moment, only Roughness to Standard is available.
The PBR rendering mode is available in Unity via the Specular/Glossiness mode or the Roughness mode. The textures built for one mode aren't direcly usable in the other mode. This tool/project is made to help you automatically convert the textures from one mode to the other.
In Unity, the Standard shader is asking for a Metallicity map, with the Smoothness being stored as the Alpha channel of the Metal map.
The Smoothness is equivalent to the inverted Roughness.
That means that to go from Roughness to Standard, you take the Roughness map, keep one channel, invert it, and store it into the alpha channel of the metal map.
A test is available in the project, to give a comparison between the three shaders.
The (ugly) test model was created in Blender, and exported as FBX.
The textures were made to use the Roughness mode.
The model on the left is using the 'Roughness' shader, also called 'Autodesk Interactive' in Unity.
The model in the center is using the 'Standard' shader, while direcly using the textures of the 'Roughness' mode.
The model on the right is using the 'Standard' shader, while using the textures of the 'Roughness' mode, that have been converted to 'Standard'.
You can visually check that the model on the left is similar to the model on the right.
By substracting the images (left minus center, left minus right and center minus right), you can have the visual proof of the effective difference between the images.
The code is built around two classes: TextureConverter and TextureConverterGUI.
For the moment, the conversion is only possible from Roughness to Standard. The other way, Standard to Roughness, isn't implemented yet.
Change the ugly GUI. Implement Standard to Roughness. Implement the 'short naming' convention.
The project is using OpenCV as an asset, to do the texture conversion. The asset is OpenCV plus Unity : https://assetstore.unity.com/packages/tools/integration/opencv-plus-unity-85928
The project is using StandAloneFileBrowser to access the native file browser : https://github.com/gkngkc/UnityStandaloneFileBrowser
The C# code of the app and the Unity project is MIT licensed : https://github.com/github-for-unity/Unity/blob/master/LICENSE