Exact Cuts the Way You Want Them!
The new Knife brushes are designed to accurately cut and close a mesh along the precise line of the stroke. The result is an exact profile based on what you draw. The new topology created is quads and so can be sculpted. This is a powerful and versatile new tool which, unlike the Trim brushes, can be used with symmetry.
This brush uses the Curve stroke.
This brush uses the Lasso stroke.
Using the Knife Brushes
Select which brush you want to use by holding Ctrl+Shift and selecting from the Brush palette pop-up. Turn on symmetry if you want to use it. Hold Ctrl+Shift and start drawing off the model. Finish drawing off the model and the cut will be made. The new surface will have its own Polygroup.