Creating Geometry on a Mesh Using Preset Shapes

Primitive slice allows you to cut geometry on a mesh using a preset shapes or curves and is available as both a direct and procedural modeling tool.

The Primitive Slice tool is found under the Edit tab.





Creates a rectangle 2D projection


Creates a circle 2D projection


Creates an ellipse 2D projection


Allows you to drive a slice using one of the profiles that Modo comes packaged with or with a profile that you have generated yourself.

How to Cut a Shape Using Primitive Slice

To use the Primitive Slice tool:

  1. Create a new mesh
  2. Navigate to the Edit tab, and enable the Primitive Slice tool
  3. With the tool enabled, select what Type you want your slice to be. You can assign what type of shape you want your 2D projection to be by selecting one of the four primitive types from the Type dropdown in the tool's properties window.
  4. With your type assigned, click where on the mesh you want the slice applied
  5. Depending on the size of the mesh you created, you may need to resize the 2D projection. This can be done by clicking and dragging the scale handles or dragging the corners of the bounding box around the 2D projection

    2D Projections stay live until you drop the tool, so they can be moved from face to face by clicking within the viewport.

Cutting Types for the Primitive Slice





Everything outside of the 2D outline projected onto your mesh item is cut away.


Projects the 2D outline onto your mesh item and applies an assigned material to the new geometry within the outline. Materials can be assigned via the Material input under the slice effector tab when stencil is enabled. This operation does not remove any mesh.


The 2D projection is used as an outline, and any mesh that exists within it is removed. This operation is also repeated on the face opposite the face your curve is projected on, creating a hole through the whole mesh.


The 2D Projection acts as an outline projected onto your mesh. This operates in the same way as Stencil but does not impact the surface material.


Combines the 2D projection with your mesh item and removes any overlapping geometry


A mesh is created where the Mesh item and 2D projection overlap, while all sections where the Mesh item and 2D Projection do not overlap are removed.


The 2D projection is used as an outline, and any mesh that exists inside of it is removed


The 2D projection and Mesh Item are joined together to create a single mesh.