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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26 views

Is this valid geometry? Any problems for games?

I'm looking to make low poly models for games so I'd like to keep poly counts minimal, but there is one thing I've done with the knife tool and I'm not sure if it causes any issues. I honestly don't ...
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18 views

How to cut extra piece of face on intersection with other face? [duplicate]

There is no common edges or vertices on intersection
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1answer
46 views

Airplane windshield

I’m trying to create a high detail 787 and I am currently on the windshield part. My question is how do you properly model a knife project object to work on all axis? Here’s my current window cutout: ...
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26 views

Knife Tool creates redundant edges and faces

When I use the Knife tool, Blender 2.81 create edges and faces which I don't want. How can I only create the edges and vertices which I draw with the knife tool?
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1answer
21 views

How do I attach floating vertices to the mesh?

I am trying to make a turbine with cuts in the sides. I did this with the knife tool and copied the vertices made with the knife tool to the areas marked on the picture. At the place where I used the ...
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1answer
66 views

How to use one object to cut a hole into another one [duplicate]

My issue is that I have 2 objects in edit mode, I want to use the second object to cut the first one to make a hole. I hope the image can make what I want a little clear because I don't find the ...
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1answer
53 views

The knife tool won't show the exact result that was done before pressing enter

So the first picture is right after I selected where I will cut, and the second picture is after pressing Enter/Space Bar which should apply my previous result to the world. But it is not what I asked ...
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15 views

Is there a way to bisect using a compound line or curve?

Right now, the bisect tool only works with a single straight line. I'm just wondering if the the question above is possible and, if so, how?
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1answer
172 views

Knife Project not available 2.8 (trying to cut two shapes out of one)

For some reason my knife project is not available when I search it, the only thing that comes up is knife, I am trying to cut one shape out of another shape but keep both shapes in tact so I would ...
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29 views

Why can't I use my knife tool project wide?

Been using Blender for years, but for some reason in this project I'm working on I can't use the knife tool. Its all low poly stuff and I've used the knife tool in the project since I started it. At ...
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19 views

Is it possible to Cut a curve in a sphear?

I want to cut a semi-circle curve into a sphear then apply solidify modifier. However i always end up with crimping along the curves. Is it possible to cut smooth curves in blender??
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14 views

How to cut edges with knife without deforming new vertex and edges?

I'm trying to cut a ring with knife tool in a rigged mesh, but new vertex and edges move to another position, I used to do this procedure but I didn't have problems, I don't know if I pressed a key, ...
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42 views

Attach road to terrain in a single mesh

I have the following terrain and road (extracted from OSM) i want to combine them so i can have 'nice' quads for the road and borders mixing nicely with the terrain; and combine everything in a '...
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1answer
37 views

knife tool not ending

I'm just starting to use the knife tool and, after I finish using the knike tool, I can't seem to get it off of the knife tool. How do I get it off of the knife tool?
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20 views

Can i select “extra edges” in ngon by script or special command in blender?

I have a problem. Maybe somebody can help me. I want select man on plane after knife projection without these "extra edges by script or one command". 1) Can i select "extra edges" in ngon by script ...
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2answers
19 views

Pushing back part of extruded region after using knife tool

Is there an easy way of pushing back the faces on the left part on the screenshot (selected faces) to the place the original faces were extruded from? Result should be like the one the right side. The ...
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1answer
79 views

Problem with Intersect (knife) - making extra cuts in mesh

I am trying to make a thread around a cylinder by cutting faces at the intersection. The cut tool makes extra vertices and connects vertices in random places. I also tried using the boolean intersect ...
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3answers
928 views

Making a hollow cylinder - Blender 2.80

I am trying to recreate the C64 logo in 3D, which roughly looks like this: C= My thought was to create a cylinder the size of the C, then create a second cylinder the size of the inside of the C, lay ...
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1answer
71 views

How to fix weird edges when doing knife project?

I am quite new to hard surface modeling but wanted to get into it a little bit. I am doing something like a Porsche 911 back and wanted to cut out the bonnet area. Since I thought Knife project would ...
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1answer
40 views

Cut out everything within a volume. Is it possible?

I have a very large model of terrain, spanning several thousand kilometers, with meshes of buildings and trees scattered across it. I'm only interested in one single area of the terrain, and I want to ...
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1answer
225 views

knife tool 2.8- used in past with no problems

Vertices are not appearing when I drag with the knife tool across the object in edit mode. Am I missing a toggle somewhere? I would include a picture/screenshot but wouldn't really show you anything ...
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1answer
64 views

Adding a vertex onto an angled edge in precise X position

I'm designing a part for 3D printing, but I do not know how to cut an angled edge at a precise absolute X position. I marked in red the place where I would like to insert a vertex. It's exactly 2 ...
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1answer
284 views

Blender 2.8 (Python) - knife project

In Blender/Python 2.8, I am trying to use knife project to cut a circle through a cube. I am attempting to automate a process I can do manually. My code is below; the last line throws this error: ...
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277 views

Blender 2.8 carving a circle out of the face of a cube using the knife tool [duplicate]

In Blender 2.8, I am trying to cut a circle out of one face of a cube, but for some reason I can't get it to work. My procedure thus far: (a) Add the cube (add -> mesh -> cube) (b) Add the circle (...
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2answers
52 views

Beginner Problem with Knife Tool

How can I use the Knife tool to create a line between two vertices? When I try to use it, the tool simply deselects my first vertex.
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106 views

Break up Model and Texture For Unreal Engine 4 Import

I have a large model (.obj file) that was generated by another piece of software and represents a real world location. I also have a very large texture (.jpg file) that was created from images of that ...
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65 views

3D Jigsaw Sphere

I've made a sphere which is UV wrapped with a picture of a world map, and then made hollow by using the 'solidify' modifier. I was wondering if I can break up this hollow sphere into a 3D jigsaw ...
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1answer
55 views

How do you cut a clean hole into an object that has been subdivided?

I can't get it to work using any of the existing answers to this question. I have a box that has been subdivided. I want to cut a square hole into it. I've tried using Knife Project and the Boolean ...
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1answer
25 views

Knife cut with closed sides like boolean difference does

I am using knife project to cut holes into an object. Is there a way to close the sides of the cut so I cannot see the hollow inside of the remaining part? I created the second picture using boolean ...
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1answer
44 views

Making a printable half sphere with a cutout in it for 3D printing

I made a half sphere which prints nicely. The sphere is to be used as a stencil for marking your golf ball. I used the Knife Project to cutout the F. This however created a lot of non-manifolded ...
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1answer
254 views

How can I make the knife tool cut in a straight line between two vertices?

If I were to make a sphere and cut between a vertex near the sphere's "north" and a vertex near the sphere's "east," the cut becomes curved in a way reminiscent of the Coriolis effect. I just want the ...
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2answers
90 views

Why I can't cut there with the knife tool, I want to make a quad out of this n-gons

Why I can't cut there with the knife tool, I want to make a quad out of this n-gons
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63 views

Split unjoined mesh into smaller grid based chunks

I have a large blender scene consisting of different objects like streets, trees, walls, roofs, etc. all created from an openstreetmap file imported into blender. I want to split the complete scene ...
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1answer
125 views

Non-manifold, bad contig Edges and Sharp Edges on simple basic geometry

I have had issues trying to produce clean geometry for 3D printing for what is simple geometry. I check wether my mesh is clean or not using the 3D printing addon. Here is a step by step simple ...
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1answer
247 views

How to make a precise bolt hole in a simpler way?

I'm new to blender and using it to create 3d objects for my printer. Part of this is "cutting" holes for bolts very precisely which I managed to do but my way is so long/tedious I must be missing ...
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1answer
209 views

How to evenly divide a face when loop cut doesn't work

I have a face. It is rectangular, but has extra vertices linking it to surrounding faces. From what I've read, these extra vertices are likely the reason why loop cut (my go to tool for this type of ...
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1answer
594 views

Knife tool won't select edges

I've looked everywhere but nobody has this issue, I'm using blender 2.8 and I'm trying to cut a plane model from a top view, but when I press k, select the edge, and then try to cut the inside, it ...
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1answer
1k 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 ...
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1answer
599 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?
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1answer
143 views

How do I remove the overlap from merged meshes?

I have recently decided to delve back into 3D modeling, I am a hobbyist I guess you could say. I have been trying to find a solution for this particular problem for days now. I have scoured this as ...
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2answers
505 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 ...
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1answer
299 views

How to delete internal intesected faces?

The following mesh is created by converting a curve with bevel effect like below: The mesh has some faces which extrude into the inside of the shape. This effect can be seen by cutting the mesh into ...
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1answer
64 views

Quad Junctions. Why are some not working the same as identical looking one nearby?

NOTE: as per Moonboots helpful suggestions. Here is the .Blend file for this problem: Hello all I am trying to learn Blender. I've read lots and watched lots of videos and kinda understand the ...
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1answer
139 views

How can I cut an edge at the mathematical middle?

I have an edge selected and I need to add a new point that is exactly at the middle of that edge. How can I achieve that?
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1answer
294 views

Knife tool with bmesh API

I need to find the intersection curve between two (open) meshes, and I can do that interactively with the knife tool. In search for a way to do it from a script, I came across the following highly ...
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1answer
101 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 ...
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28 views

Using edge-loops/knife tools on character model?

I am doing an example model through a workbook, and I am stuck at a specific section. This section is asking me to add edge-loops to my model (creature figure). I can not get the edge loops to work ...
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2answers
623 views

Cutting multiple objects

How do i cut all these small cylinders in stright line like this?
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95 views

How can I add/cut face into an inside face of a cube?

I'm unable to cut a face into an inside face of a cube as it's not really accessible, can't move the view there. I was trying to zoom in and navigate inside of the cube in order to use a plane to ...
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0answers
63 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?