@mifththanks for developing the app link! I was not aware that it still works in current versions of Houdini. However, I wonder if it would be possible to make the App Link work inside of SOPs. Ideally it would be one node in SOPs that takes the input and sends it to 3D-Coat to do the task that was specified in the dropdown, and loads the result (after work in 3D-Coat) back into the same node. the node could have two output ports. One with all Geo data from the Sculpt room, one with all Geo data from the Retopo room. The Retopo stream would then carry the UV and Materialpath data if there is any. Separate sculpt-objects or separate poly groups could appear in the shape of a name attribute or groups. Finally it would be great to have a dropdown to specify renderer and the place to drop the material networks so that the shaders get build automatically.
I'm not sure if any of that is even possible, I just wanted to share this in case you revisit the development of the App-Link. I tried to build an Asset myself, but I obviously can't get over the python part.... Hoping for the best