If we have the branch objects but not the surface, there are two possible main reasons why BlockSurfaces will not generate the surface:
1. It may be that the object that generates the BlockSurfaces surface exists, but the Geometry Nodes modifier has been broken. To fix it, we have the "Restore BkSurfaces Object" option in the TOOLS menu. This will reload the Geometry Nodes for the modifier and restore its functionality, generating the surface again from the objects in the collection.
You need to press the "Restore BkSurfaces Object" button, and all the objects in the scene that have this problem will be restored.
If after applying this tool, not all objects are restored and some remain unfixed:
2. It may be that the BlockSurfaces object with the modifier does not exist. To fix this, we have the "Generate BkSurfaces From Collection" tool. This will create a new Blocksurfaces object with the collections we have in the scene and apply the modifier with the Geometry Nodes.
Just select an object from the branches you want to recover and press the "Generate BkSurfaces From Collection" button to generate the new BlockSurfaces objects and have the surfaces created again.
