1.7.1.3. Deleting and Dissolving

Reference

Mode: Edit Mode
Panel: Tool Shelf ‣ Tools ‣ Mesh Tools ‣ Remove: Delete
Menu: Mesh ‣ Delete

These tools can be used to remove components.

1.7.1.3.1. Delete

Reference

Hotkey: X, Delete

Deletes selected vertices, edges, or faces. This operation can also be limited to:

Vertices
Delete all vertices in current selection, removing any faces or edges they are connected to.
Edges
Deletes any edges in the current selection. Removes any faces that the edge shares with it.
Faces
Removes any faces in current selection.
Only Edges & Faces
Limits the operation to only selected edges and adjacent faces.
Only Faces
Removes faces, but edges within face selection are retained.

1.7.1.3.2. Dissolve & Limited Dissolve

Dissolve operations are also accessed from the delete menu. Dissolve will remove the geometry and fill in the surrounding geometry. Instead of removing the geometry, which may leave holes that you have to fill in again,

1.7.1.3.2.1. Dissolve

Reference

Hotkey: Ctrl-X

Removes selected geometry, but without creating holes, effectively turning the selection into a single n-gon. Dissolve works slightly different based on if you have edges, faces or vertices selected. You can add detail where you need it, or quickly remove it where you do not.

Dissolve Vertices
ToDo.
Face Split

When dissolving vertices into surrounding faces, you can often end up with very large, uneven n-gons. The face split option limits dissolve to only use the corners of the faces connected to the vertex.

_images/bmesh_dissolve_face_split.png

Figure 1: Dissolve Face Split option.

Left: the input, middle: regular dissolve, right: Face Split enabled.
Tear Boundaries
ToDo.

1.7.1.3.2.1.1. Examples

_images/modeling_meshes_editing_basics_delete_dissolve-examples.png

Figure 2: 1) Original mesh 2) Face Split: Off, Tear Boundaries: Off 3) Face Split: On, Tear Boundaries: Off 4) Face Split: On/Off, Tear Boundaries: On

1.7.1.3.2.2. Limited Dissolve

Limits the dissolve on selected vertices and/or edges not touching a hole.

_images/bmesh_limited-dissolve.png

Figure 3: Example showing the how Limited Dissolve can be used.

Max Angle
Reduces detail on planar faces and linear edges with an adjustable angle threshold.
All Boundaries
ToDo.
Delimit
ToDo.

1.7.1.3.3. Edge Collapse

Reference

Mode: Edit Mode
Menu: Mesh ‣ Delete ‣ Edge Collapse
Hotkey: Alt-M, Collapse

Merges each edge into single vertices. This is useful for taking a ring of edges and collapsing it, removing the face loop it ran through.

_images/collapse1.png

Figure 4: Selected Edge Ring.

_images/collapse2.png

Figure 5: Edge Ring Collapsed.

1.7.1.3.4. Edge Loop

Reference

Mode: Edit Mode (Vertex or Edge select modes)
Menu: Mesh ‣ Delete ‣ Edge Loop
Hotkey: X or Delete, Edge Loop

Edge Loop allows you to delete a selected edge loop if it is between two other edge loops. This will create one face-loop where two previously existed.

Note

The Edge Loop option is very different to the Edges option, even if you use it on edges that look like an edge loop. Deleting an edge loop merges the surrounding faces together to preserve the surface of the mesh. By deleting a chain of edges, the edges are removed, deleting the surrounding faces as well. This will leave holes in the mesh where the faces once were.

1.7.1.3.4.1. Example

The selected edge loop on the UV Sphere has been deleted and the faces have been merged with the surrounding edges. If the edges had been deleted by choosing Edges from the (Erase menu) there would be an empty band of deleted faces all the way around the sphere instead.

_images/deleteedgeloop1.png

Figure 6: Selected Edge Loop.

_images/deleteedgeloop2.png

Figure 7: Edge Loop Deleted.