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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.
3
votes
Can't use "Knife Project"
Your shape seems closed, it looks like it can't work this way, so just open it:
3
votes
Accepted
Making a hollow cylinder - Blender 2.80
It really depends on what you want to achieve at the end, but you can begin this way:
Put your logo as a Background. Create a circle as large as the logo's C.
Press E to extrude, presse Enter, …
0
votes
Knife Project, bad result
Once you've done your Knife Project operation, don't delete the vertices, instead press X (Delete) > Faces Only.
0
votes
Pushing back part of extruded region after using knife tool
Try the Destructive Extrude addon, demo here, download here.
Once activated select your face(s) and altE > Destructive Extrude.
2
votes
Accepted
How to cut the same geometry into two similar meshes?
To cut through with the knife, press Z after you've pressed K. It won't work if you've selected 2 objects though. You could also use the Knife Project tool for the same kind of purpose, it would allow …
0
votes
Wierd shading when cutting faces
As Christopher Bennett explains, you have ngons all around, it creates artifacts when the surface is round. What you should do is use the current topology, here is a solution:
6
votes
Accepted
Using knife project method to make a shape into the mesh
You could do the other way around, beginning with the shape then extrude to get your rectangular object, at the end when you'll give it the Subdivision Surface modifier it will just need a bit of work …
3
votes
Accepted
some vertices won't snap when using knife tool
The vertices you're trying to snap to are not part of the face you're trying to cut through. You can't cut through nothing to join a vertex to another one.
5
votes
How to wrap a 2D shape and Knife Project toward a cylinder axis?
You could begin with a 2D shape:
Give it a Simple Deform modifier, Bend mode, 360° on Z:
Solidify, etc:
2
votes
How to mirror knife cuts on existing mesh?
The knife cut won't be symmetrized automatically with the X symmetry option on, this tool will only move or remove the vertices that are moved or removed on the opposite side. What you can do though i …
3
votes
Accepted
Blender 2.8: how to cut non visible edges?
To cut through, press Z just after you've activated the knife.
And press C to cut perpendicularly to the view and ctrl to cut an edge by its center.
1
vote
Accepted
Making a printable half sphere with a cutout in it for 3D printing
Once you've deleted the face you can extrude your object to give it thickness, or give it a Solidify modifier then apply. If there's already thickness you could extrude your F and use a Boolean modifi …
1
vote
How do I remove the overlap from merged meshes?
You could do it with the TinyCAD addon or with some extrudes.
If you want to start with your 3 parallelepipeds you could use the TinyCAD addon:
Download and istall the addon.
Join your parallelepip …
3
votes
Knife Project not available 2.8 (trying to cut two shapes out of one)
You need to select the first object, then the second, then go in Edit mode, then header menu > Mesh > Knife Project. Note that it will take your view angle into account.
If you want to project the in …
1
vote
Cut/mask multiple planes along a circle at once
We lack a bit of informations about what you want to do but let say you just want to dig a hole circle on your shape:
Select all your beams, join them with J.
Create a cylinder, make it invisib …