Hi @Black_Feather ,
There are a couple ways you might go about this.
- Most precise:
Create an overlapping piece of geometry as a separate subtool that completely envelops one of the sections of geometry you wish to separate, and that creates the shape of the cut you want to make where they intersect. So if you want it to cut along those recessed areas the geometry needs to follow that shape. If you want hard edges, then that cutting shape has to have sharp planar surfaces.
Then simply perform two Live Boolean operations in succession–one set to “intersection” mode so that it creates a new mesh from the section of geometry the cutting shape envelops, and one set to “subtraction” so that it creates a new mesh with that portion cut away.
You will then have two meshes that fit together perfectly, separated by the contour of the cutting mesh. Append one to the other or both back into the original tool.
- Quick and Dirty:
Use the Knife Curve brush, and activate Brush> Clip Brush Modifiers> BRadius.
Now when you cut along the knife curve stroke it will cut out a “slice” of the mesh along that stroke with the thickness based on the DrawSize.
However, if you press and hold ALT after starting the stroke, it will instead cut the mesh into two or more separate volumes separated by a thickness determined by the Drawsize. Please see the following image:
Please keep in mind that the Knife Brushes are very sensitive to issues with the geometry. If your mesh has any problems reported with Tool> Geometry> Mesh Integrity Check Mesh you will need to fix these or you may experience stability issues with the brush.
Likewise , try to avoid cutting through edges of the model that have already been cut by the tool, as it produces suboptimal topology along those edges that could be problematic for additional cuts. It may periodically be necessary to resurface the mesh to clean it and return it to quads to make further cuts in an area.
Good luck!
