Multires Modifier undo/revert brush?

Question

I have a low poly model that looks nice. I use the Multires modifier to subdivide it and sculpt extra detail in some parts of the mesh. Now i discover that i messed up a part. Can i "undo" parts of the multires sculpt like with a brush thats called revert to original subdivision. I can of course always remove the whole modifier and restart adding detail, or try to resculpt the messed up part, but its very difficult to do this if you want to stay as close as possible to the low poly mesh.

Is there an addon that lets you do that in a convenient way? Or a built in feature that I overlooked?

How do you do it? Is there a different workflow that allows you to do this?

Answer 1

Try the Multires Displacement Eraser brush to restore the low-poly base mesh.

If it doesn't help you still can try the following workaround:

• switch to Edit mode
• select the vertices of the bad area and separate the mesh with P Separate > Selection
• select the separated mesh object, and remove the MultiRes modifier from it
• now join it again with the original mesh object. Make sure the original mesh object is the active¹⁾ object so the result gets the MultiRes modifier.
• now there are duplicated vertices where you had separated the meshes. This can cause problems. So switch to Edit mode, select the vertices that you want to merge (or everything), and weld the meshes with a M > Merge By Distance operation. Otherwise, the separated mesh is still a loose part after you joined them.

Note 1): The active object is usually the one that you selected last in the viewport. It's highlighted in orange, while the selected object(s) are highlighted in red. Only the active object keeps its modifiers when you join objects.