Knifepro

孙堪伟 in Modeling

Viewport cutting system

Draw the cut.
Skip the setup.

Name: KnifePro
Brand: 孙堪伟
Price: 9.00 USD
Availability: InStock

Knifepro turns a cutter outline into an interactive viewport operation. Position the contour where it belongs, choose projection or Boolean cutting, and finish without assembling the usual temporary setup by hand.

Version 1.1.4 Blender 4.5 - 5.2 Interactive viewport workflow

MOVE

Drag the contour into place

SCALE

Pull a corner to resize

ROTATE

Use Ctrl + Wheel

The modeling problem

A simple shape should not need a long cutting ritual

Projection cutting often means preparing a cutter, aligning the view, adjusting scale and position, switching selections, and only then running the operation. Knifepro keeps those decisions in one visible contour over the model.

Without Knifepro

Setup interrupts the shape decision

The modeling idea gets buried under object placement, view alignment, and operator steps.

With Knifepro

The contour becomes the workflow

Place, resize, rotate, choose the cut mode, select the target, and execute.

Positioning and resizing a cutter contour directly in the Blender viewport

Three cutting choices

Choose the result while the contour is still visible

Projection Cut

Project the visible contour onto the selected target mesh from the current view.

Cut Through

Toggle through-cutting from the on-screen mode label when the cut must pass through the mesh.

Boolean Cut

Turn one closed edge loop into a Boolean difference without building the temporary cutter manually.

Built-in knife library

Start with a shape instead of an empty object

Browse 50 ready-to-use cutter presets with visual thumbnails. Pick one, choose Import and Cut, and enter the projection workflow immediately.

50 preset shapes

Geometric forms, symbols, and practical profile shapes.

Five favorite slots

Bind frequently used shapes and switch with Alt + 1–5 during the operation.

Browsing the Knifepro visual library and launching a preset cutter

Sight align

Face the surface before you project

In Edit Mode, select one or more faces and use Sight align from the context menu. The view rotates toward the selected surface and frames it, giving the projection a clear starting direction.

Aligning the Blender viewport to selected mesh faces before cutting

Bring your own shape

Clipboard input for references and custom cutters

Press Ctrl + Shift + V and Knifepro detects compatible clipboard content. Paste an image as a view-aligned reference, or paste SVG data and optionally process it into mesh edges for projection cutting.

Image clipboard

Adds the clipboard image as an Empty aligned to the view. This path uses the optional Pillow dependency.

SVG clipboard

Imports valid SVG data and can convert the result to clean edge geometry for use as a knife profile.

Pasting an image from the clipboard into the Blender viewport

Importing SVG clipboard data and preparing it for projection cutting

Direct controls

Keep your attention on the model

Drag contour

Move the cutter outline.

Drag corners

Scale the outline.

Ctrl + Wheel

Rotate by the preferred step.

Alt + 1–5

Switch favorite cutters.

Alt + C

Execute the cut.

Backspace or Esc

Cancel the operation.

The add-on preferences expose the registered shortcuts, contour colors, line width, and rotation step.

Useful output

Projection cuts stay organized for the next step

After a successful projection cut, Knifepro creates three vertex groups on the target mesh: the new cut edge, the area inside the contour, and the area outside it. That gives later modeling operations useful selections without rebuilding them manually.

CutEdge

New cut boundary

CutIn

Vertices inside

CutOut

Vertices outside

Quick start

From a cutter to a finished operation

Choose a knife profile

Use a preset from the Knife Library or select your own edge-only mesh.

Start Projection Cut

Launch it from the library or the 3D Viewport context menu.

Place the contour

Move, scale, rotate, and choose Projection, Cut Through, or Boolean mode.

Select the target and execute

Select the mesh to cut, then press Alt + C.

Before you begin

A few clear requirements

A custom projection cutter must be a mesh made from edges without faces.
Boolean mode requires exactly one closed edge loop.
Clipboard image import requires Pillow; install or check it from the add-on preferences.
Install Knifepro from its ZIP file through Blender Preferences.

Common questions

Can I use my own cutter shape?

Yes. Select an edge-only mesh and start Projection Cut from the 3D Viewport context menu. SVG clipboard data can also be processed into edge geometry.

Why is Boolean mode unavailable for my cutter?

Boolean cutting accepts one closed edge loop. Open contours, multiple loops, or cutters with unsuitable geometry do not meet that requirement.

Does image import create cutting geometry?

No. A clipboard image is added as a view-aligned reference. Use a mesh outline or process imported SVG data when you need a cutter.

Can I change the overlay appearance and controls?

Yes. Preferences include contour colors, line width, rotation step, shortcut entries, and five favorite cutter bindings.

Current release

Version 1.1.4

Improved Pillow installation for clipboard images, with immediate refresh, self-check, and accessible logs.
Improved cleanup after completed or failed cuts to prevent leftover overlays and operation state.
Improved contour updates after view changes and favorite-cutter switching.
Added clearer handling when the built-in cutter library file is unavailable.