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blender-portable-repo/extensions/user_default/retopoflow/docs/knife.md
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2026-03-17 14:58:51 -06:00

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Knife Help

Shortcut: {{ site.data.keymaps.knife_tool }}

Quick Shortcut: {{ site.data.keymaps.knife_quick }}

The Knife tool allows you to cut into the existing geometry similarly to Blender's Knife tool.

Note: the Knife tool will only cut into existing geometry; it will not create new vertices, edges, or faces.

If nothing is selected, the first insert will

  • insert a new detached vertex if the mouse is hovering a face,
  • split the hovered edge,
  • select the hovered vertex, or
  • set a knife starting point (does not create a new vertex).

The subsequent insertions will cut in new edges, splitting faces and edges accordingly.

Note: an existing face will not be split until there are distinct entrance and exit vertices. Until the face can split, the created vertices and edges will be non-manifold (possibly detached) geometry.

Creating

| :--- | :--- | :--- | | {{ site.data.keymaps.insert }} | : | insert geometry connected to selected geometry | | {{ site.data.keymaps.knife_reset }} | : | resets the knife starting point |

Selecting

| :--- | :--- | :--- | | {{ site.data.keymaps.select_single }}, {{ site.data.keymaps.select_single_add }} | : | select geometry | | {{ site.data.keymaps.select_paint }}, {{ site.data.keymaps.select_paint_add }} | : | paint geometry selection | | {{ site.data.keymaps.select_path_add }} | : | select along shortest path | | {{ site.data.keymaps.select_all }} | : | select / deselect all | | {{ site.data.keymaps.deselect_all }} | : | deselect all |

Transforming

| :--- | :--- | :--- | | {{ site.data.keymaps.grab }} | : | grab and move selected geometry | | {{ site.data.keymaps.action }} | : | grab and move selected geometry under mouse | | {{ site.data.keymaps.smooth_edge_flow }} | : | smooths edge flow of selected geometry |

Other

| :--- | :--- | :--- | | {{ site.data.keymaps.delete }} | : | delete/dissolve/collapse selected | | {{ site.data.keymaps.rip }} | : | rip selected edge | | {{ site.data.keymaps.rip_fill }} | : | rip and fill selected edge |