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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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101 views

How to use knife tool in python? [duplicate]

I want my script to cut geometry faces with knife tool. I read about bpy.ops.mesh.knife_tool() but there's no parameter for specifying the cut path. Is there an ...
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1answer
985 views

Having trouble with knife tool

I am having an issue with the knife tool. I'm attempting to make a cut where the maroon line is in the above image, however, when i click the left mouse button, the line goes away, and no cut is made. ...
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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:
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98 views

Cut and separated object don't fit in real life

My problem is with cutting one big irregular pipe in two pieces which are printable in SLA 3d printer. After have it cut with "knife" I merge two edges with "bridge edge loops". The procedure is ...
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1answer
397 views

Knife Tool - Constrain to global axis?

Is there anyway to cut a face whilst still constraining to a global axis regardless of the view orientation? The knife tool appears to constrain to 45 degree increments but this only appears to be ...
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1answer
134 views

Shading Issues after knife project

Just starting out in the world of Blender 3d and I am trying to replicate the bottle below but am having difficulty creating the ridges that go around the centre of the bottle. ​I have tried a couple ...
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375 views

Blender exported mesh extremely deformed

After exporting my mesh to FBX form to test out my sails in physx clothing, I noticed my mesh was terribly deformed. There were a lot of random spikes and abnormalities that appeared in the main hull ...
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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 ...
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1answer
115 views

3D Connexion Space Mouse stops responding during Blender operations

As the question title suggests, I have a minor problem with Blender's implementation of Space mouse/3D mouse control. I finally got the actual operation of the 3D mouse to be like I want. Except ...
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623 views

Intersect (Knife) not working correctly

I want my mesh to connect so I attempted Intersect (Knife). As you can see these edges are not connected, I pulled it away for the picture so you can see the topology. So I selected these faces and ...
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1answer
210 views

Union partially overlapping cubes without boolean modifier

My goal is to generate a model composed of many partially overlapping cubes. But I need to get rid of the parts where they overlap, so I have a single mesh without any intersections. One of the ...
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1answer
3k views

Knife project not cutting through

I have a simple rounded edge prism. I created a circle to use as the "knife" because I want to cut 2 holes through the prism. I first select the circle, then select the prism, go into ortho view, ...
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2answers
780 views

Editing different meshes together — Bezier curve and Circle

I've had 100% success finding answers to questions on this site, though, I've finally become stalled on one problem in which I don't even know how to phrase into a search. I can't seem to edit both ...
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629 views

How do I edit a face symmetrically, or copy and mirror it?

I want to cut out the shapes seen in the background of the image below, onto the plane: I want to do it symmetrically, preferably using the knife tool. The mirror modifier won't work here; I only ...
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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 ...
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2answers
647 views

Cut faces where they intersect with the mesh

I exported an object from a game and I am working to clean it up so I can 3d print it. I am almost finished, however I have a small issue with the gun barrel, where I created some new faces to close a ...
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36 views

Want this cut-out part to be seperate object, how? [duplicate]

I have cut out this selected piece with a knife and i want it to be a part of its own in the right colon (scene section). Right now its still part of the cube around of it. What is the option for this?...
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1answer
752 views

Selecting 1 side of an edge loop in a mesh

Hi, I created an edge loop by knife tool on this model (with K , then Z shortcuts in edit mode). Now, how can I select all the vertices only right or left side of it (selected vertices will be ...
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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 ...
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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)...
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1answer
102 views

Automated vectoring or knife tool / autotracing

I use the knife tool in Blender to create holes in the object geometry (trace the assigned texture). This takes a lot of time. Is there a function or a software product to autotrace the assigned ...
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1answer
420 views

Messed up Topology (Shading?) due to the usage of the Knife Project Tool

Dear Blender Stack Exchange Community, After trying to model a sword (after a concept art) I did run into some issues after using the Knife Project Tool. I am trying to add some Screws using the ...
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1answer
316 views

Height map to cube

I have an textured object that looks approximately like this. It is one-sided, like a height map. I want to make sort of a cube out of it. And I want to keep the texture. How could I do it? I ...
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1answer
515 views

Why does 'Knife Project' only sometimes select the new faces?

In some cases the result of the cut with knife project is not selected, why? How do I get the result to be selected?
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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 ...
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133 views

How can I Knife Project only selected polygons, rather than the whole object?

So I'm trying to knife project a circle here See the circle? Well I'm trying to cut it into the blue part. But it'll cut it into the pink and green as well And even still, the circle doesn't even ...
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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 ...
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1answer
94 views

Blender cutting face to fit a hole

I have a hole like this in my mesh I wish to fill these 2 holes by cutting larger faces to fit, that way I don't have to do the UVs myself since these large square faces already have UVs. Example: ...
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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 ...
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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 ...
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2answers
228 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 ...
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1answer
213 views

Odd Vertices When Using The Knife Tool

When I use the knife tool on my mesh, any face connected to the cut becomes "incorrect". (I don't know the true term) The underside of my mesh was smooth before I cut the mesh. Now, there are odd ...
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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 & ...
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276 views

Knife project not working when using imported .svg curve

I am trying to import a .SVG curve and use it to cut shapes into a robot's mesh that I am modeling. After importing the curve and following Thom Blair III's advice from this question, the result ...
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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-...
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2answers
672 views

Knife Tool Making Extra Faces

The knife tool is one of the things I use most in blender. I use it to add vertices with out adding a Loop/cut/slide. I recently got a new laptop and installed blender on it, and it creates a random ...
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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 ...
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1answer
319 views

Delete parts of a grid outside of another object

I created a grid (as multiple curve paths) which is in and outside of a sphere. When I'm trying to delete all parts outside with the Boolean Modifier, it says "Cannot execute boolean operation". How ...
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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 ...
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2answers
2k views

How do I cut up a 3D object into separate pieces

I have here a 3D piece of glass which I need to smash in Unity. Is there an easy way of cutting it in Blender into separate pieces? As you can see I have started cutting on one side but can't separate ...
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1answer
453 views

Is there an add-on for a knife-like tool for curves?

For instance, splitting a Bezier circle into cyclic halves cutting across its diameter is quite tedious when directly manipulating segments, control points and handles. Things get complicated when ...
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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 ...
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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 ...
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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 ...
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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 ...
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264 views

Was the knife cut tool changed?

Did knife cut tool change its behavior from 2.5 to 2.76? I noticed, that in Blender tutorial, the behavior of Knife Cut tool is described differently, than I see. Particularly, in "exact cut mode" (...
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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 ...
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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 ...
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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 ...
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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 ...