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Questions tagged [knife-tool]

The Knife Tool cuts new edges into meshes, adding vertices to user-defined points regardless of existing topology. The Knife Project Tool projects the topology of one object onto another, using the current view angle. Use this tag for questions pertaining to the Knife Tool and the Knife Project Tool.

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68
votes
4answers
159k views

How would you cut a shape out of an object using another object?

Coming from SketchUp one of the tools I miss most is the circle draw tool which lets you draw a circle on any face and then you could extrude it in/out. The only tool that I know of that comes close ...
51
votes
5answers
143k views

Cutting a mesh in half

I have a mesh which I have imported from an OBJ file. I would like to apply Material A to the section of the mesh which is on one side of a given plane, and apply Material B to the section of the mesh ...
33
votes
2answers
39k views

Cut straight lines with knife tool

How can I get the knife tool to snap to the same spot on another edge to get a straight cut. Here is an example of what I want to do: When the line turns green the cut is straight. How can I do this ...
15
votes
1answer
48k views

How to connect faces between 2 edge loops?

I'm trying to fill empty space in my mesh, and I looked at the knife tool page on the Blender Wiki, and I'm not sure if there's a way to make it so that a new edge is made using the knife tool. I took ...
10
votes
2answers
2k views

Is there any way to get a specific angle using the knife tool?

Instead of the constrained 45 degrees that happens when you press C, is there a specific angle I can get for example 35 degrees instead? It's currently cut at 45 degrees in the attached image and I ...
10
votes
2answers
4k views

Knife tool doesn't cut obscured edges

I'm using Blender 2.66, I find that the knife tool (K) doesn't work the way it used to. Dragging across an obscured edge, even if selected, doesn't cut it. There seems to be no way to activate the ...
10
votes
2answers
546 views

Can I confirm knife action with mouse, or other key than Enter?

Can I confirm knife actions with the mouse, or some other key than Enter? Going all the way to Enter breaks the flow in a way that's inconsistent with blender's philosophy.
10
votes
1answer
2k views

Remove vertex while using knife tool?

When using the knife tool, if I accidentally click in the wrong spot, is there a way to remove the last placed vertex instead of cancelling the whole operation and starting over?
7
votes
1answer
3k views

How to cut a mesh at the edge?

Is there a way I can cut by continuing an edge? So I want a cut at the red line, possibility using the knife tool, but I can't use the angle snap, since its not on any particular angle, so is there a ...
7
votes
1answer
4k views

Split mesh into two pieces using bezier curve

I've created a Bezier curve, and used to shrinkwrap modifier to project it onto my object: Now I want to cut along the curve, splitting the mesh into two. How can I do this? If I just use knife ...
7
votes
1answer
402 views

Why does the knife tool create random extra geometry?

The knife tool seems to be generating duplicate vertices, creating additional unwanted geometry. Is this a bug or related to camera or tool settings? Any idea? edit: Clarifying the vert:
6
votes
1answer
10k views

Knife project not working

In some simple cases such using the default Monkey as the object to project, the resulting cut looks nothing like the monkey. Note the selected cube only has only been cut around the monkey's eyes, ...
6
votes
2answers
3k views

How to cut a mesh by specifying the angle [duplicate]

I wanna cut a mesh by specifying the angle, but knife mode only cut 45° with C key. I want to cut by the angle around specifying the vertex.
6
votes
1answer
490 views

How do I get knife_project operator to use view settings within the operator?

I have coded an Operator that tries to change the view to Top using bpy.ops.view3d.viewnumpad, and then the ...
5
votes
3answers
3k views

Knife Project - Extrude through thickness?

Is it possible to use the Knife Project tool to somehow cut through thickness and extrude the edges that are formed? I'm trying to cut through these 4 faces (2 "cubes") but Knife Project only ...
5
votes
1answer
7k views

How to cut a hole through both sides of a cube? [duplicate]

I'm trying to make a hole through the face: So it will come out just like this hole on the other side of the mesh: If it doesn't make sense, i'm saying this: On the first picture, It clearly has no ...
4
votes
2answers
229 views

Knife Tool Limited Cut - Not Cutting All of Mesh/Edges

Currently, I am trying to cut my mesh in half with the knife tool, K. The cutting seems to work at the top and side of the mesh (I pressed enter), but it won't apply at the bottom. Img1 and Img2 ...
4
votes
1answer
721 views

Problem with knife project tool: the result is not smooth

I use a circle to cut on a cube by knife project tool, but the result is not smooth as the circle, did i do wrong some thing, please help, i'm very new to blender.
4
votes
1answer
563 views

knife_project in python

I am a blender noob trying to use bpy.ops.mesh.knife_project() in my script. It fails with the message: RuntimeError: Operator bpy.ops.mesh.knife_project.poll() expected a view3d region & ...
4
votes
1answer
379 views

Mesh Bisect Algorithm: How does it actually work?

So Ive been writing some C# algorithms for bisecting a mesh in Unity but I had a hard time finding any information on the best way to do this. I love blender's mesh bisect tool and this is basically ...
4
votes
1answer
201 views

Creating or Altering a Modifier, specifically Boolean

So, this whole idea of mine started when I got sick of using knife tool, and I can't get a handle on knife project. I started getting the results I'm looking for by using the Boolean modifier using a ...
3
votes
3answers
1k views

How to generate a cylinder with a hole except by knife tool and Boolean methods

This is a shape I want to generate. I know it is a very easy to generate by a knife tool and boolean method. But I want to use the extrude method to generate. a unfinished work is shown as following ...
3
votes
2answers
350 views

What is the best way to model the intersection of multiple hard-surface pieces?

What is the best way to model the intersection of multiple hard-surface objects? Not technically different "objects" persay - but where different pieces meet visually. What are various ways of ...
3
votes
1answer
970 views

Cut BMesh with python

Goal: Efficiently cut out (holes) or trim off regions of dense meshes defined by editable polyline or bezier curves which are snapped to a mesh surface. Uses: My narrow use is to cut teeth out of ...
3
votes
1answer
551 views

How to get the coordinates of the knife tool on an edge (in real time)?

After developing my first addon (Arrange objects along a curve), I was interested in continuing learning and developing scripts for Blender. The question now might be difficult, but I know it's ...
3
votes
1answer
402 views

How to cut a plane

Is there a way to cut a slice through a plane, like through a piece of paper? Specifically, I created a plane, gave it a thickness, and applied a cloth modifier to it. The cloth is supposed to be hair ...
3
votes
1answer
1k views

Knife project on subsurf-object leaves artifacts

I have a plane with subsurf modifier, And a circle to cut(knife project) with. The hole is cut, but it leaves mesh(artifacts) inside of it. Creasing (Ctrl E) works on the outer edges only, leaving ...
3
votes
1answer
866 views

Why does knife project cut only one hole into a disc?

I used the spin operator to duplicate a circle, after that I tried to knife project all circles (single object), all the duplicated circles don't have an effect but the original circle is cut out. Why ...
3
votes
1answer
275 views

How to subdivide concave face into quads

I'm aware of bpy.ops.mesh.vert_connect_concave() and the result is similar to what I'm looking to implement. However, with ...
2
votes
2answers
6k views

How to cut an edge at specific point?

I have an object representing a room. I want to cut a door on it. I planed to use knife tool, because I do not know any better for this - any other (or "proper") idea would be good too BTW. I want to ...
2
votes
1answer
769 views

What's the most elegant way to cut shapes out of a mesh?

I'm trying to cut shapes out of a mesh, but I'm having trouble doing it, or at least doing it properly. I'm currently trying to model this flashlight: The part I'm specifically having trouble with ...
2
votes
1answer
548 views

Blender knife tool options

So I'm 3d modeling a logo and there's one oddly shaped part that needs to be extruded. I am trying to use the knife tool to cut it out, but every time I finish it deletes the face. In the operator I ...
2
votes
1answer
575 views

Disable snapping for knife tool cut?

If I use the knife tool, and I use it near edges, the mouse will snap to them and it wont allow to me make lines close to it unless I zoom in very close. How can I disable snapping for the knife tool?
2
votes
1answer
425 views

Blender 2.8: how to cut non visible edges?

I'm using the knife tool (shift + spacebar + K) to cut a cube. I would like to reach the edges that are behind my current view also. What is the procedure?
2
votes
2answers
1k views

Slice up terrain mesh into chunks

I have terrain (ANT Landscape plugin) that I would like to cut up into chunks (don't need to be equal size) for a game engine so that I can do occlusion culling / or load and unload chunks around the ...
2
votes
1answer
7k views

Why the knife tool can't be used on some of my faces?

The knife tool or knife project tool cannot be applied on the faces shown in the screenshot, but they worked on other faces. I've used 'remove doubles' and 'recalculate normals' on my model but that ...
2
votes
1answer
88 views

Slice surface mesh with polygon

I would like to cut a shape out of a surface mesh using a polygon. The "Knife Project" function isn't working for me, as it changes the size of the polygon. When it projects the polygon down onto ...
2
votes
1answer
1k views

Separate in two parts a Mesh using Knife Project

How can I separate this mesh: Using this plane: In two separate parts, the on above the plane and the one under? Objective: What I want to achieve is to separate the mesh in two part like a ...
2
votes
1answer
122 views

Knife project tool is looking rough after I extrude on a curved surface

Hello Blender Stack Exchange Community! I'm creating a cuff bracelet and using the knife project tool to "etch" text on the inside of the cuff, but the results are super rough. The cuff (mesh circle)...
2
votes
2answers
279 views

How do I fix these mesh deformations I get when exporting from Blender to 3DS Max?

I have to export from Blender to 3DS Max in .obj format. I cut faces with Knife Tool (K), but when I imported to 3DS Max, I was presented with this problem on the edges. Is there a solution for this ...
2
votes
2answers
307 views

How to cut all faces in a specific direction from a point?

I'd like to be able to cut the faces belonging to a mesh, from a specific point, in a specific direction. For example, if I were trying to cut an icosphere from it's center at an angle 30 from the x-...
2
votes
1answer
2k views

Snap to grid using knife tool

I have a situation where, after extruding an angled face, I need to make an edge of it flush with the grid lines. I tried to illustrate what I want to do with the image below. Note, the new location ...
2
votes
0answers
60 views

How to use knife tool properly?

I am new to blender. Is there a way to make knife tool cut exactly along the axes?
2
votes
0answers
158 views

knife_project in --background

I like to use the function knife_project() in a command line : blender.exe --background --python ... but bpy.ops.wm.redraw_timer(type='DRAW_WIN_SWAP', iterations=1) isn't avaible. I try to use ...
2
votes
0answers
956 views

Merge vertex into an edge

I'd like to merge a vertex into an edge without subdivide the edge and merge the vertices; i usually use the knife tool, create a second vertex in the edge, set "cursor to selected" to the first ...
2
votes
0answers
169 views

Why is the Knife Tool so Finicky? [closed]

So many times I try to use the knife tool and it simply won't grab anything. I move the screen around randomly and zoom in and out and if I'm lucky it will eventually start working. See gif for ...
1
vote
2answers
445 views

Smooth shading of different vertices

I have this mesh: I Bisect it, select one of the parts, and Separate>By Selection. My problem is that because the vertices are not shared, there is a visible seam between the two parts. Is it ...
1
vote
1answer
869 views

Can't use “Knife Project”

I tried to use the "Knife project" tool in order to shape a soda can ring but, even though I selected both the object supposed to cut and the object "to be cut", it only results in the message "No ...
1
vote
1answer
915 views

Cutting a 2D plane using intersecting planes as a guide

Sorry if this seems like a newbie question (I'm very new to Blender!), but what's the easiest way to cut into a mesh using other objects as a guide? I attached an image for clarity. I want to remove ...
1
vote
1answer
250 views

Punching a Hole

Alright, I am new to Blender, I have watched many videos explaining how to make a hole in a mesh, but all the examples use just a plane or a cube, I am making a Helo/Jet or VTOL with props in the ...