# Questions tagged [geometry]

Questions pertaining to creating, generating or editing an objects geometry. Object geometry is defined by editing and creating the location and rotation of vertices, edges, and faces.

333 questions with no upvoted or accepted answers
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### Recreate Solidify Thickness Clamp in Geometry Nodes?

I am trying to build the Solidify modifier in geometry nodes. Generally this is simple as there are many ways to offset a copy of the geometry. And we have Extrude to create the Rim. However, I am ...
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### GeoNodes: How to use captured positions from one set of points and offset individual mesh island positions using the captured positions

Link to the blend file (uses Blender 4.0): My question is a little long, but hopefully with the screenshots it becomes clear what I am trying to achieve. Here's what I have so far in my geometry ...
1k views

### How to triangulate a polygon using Python?

I often meet the following problem: mapping a point on the surface of a polygon in 3D coordinates to the corresponding polygon in a UV map. To do that, the only way I've found is to: Triangulate the ...
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### Does Geometry Nodes use Memory or CPU when instancing?

When using Geometry Nodes what part of the computer does it use when instancing, i.e., memory, cpu? When I try to instance large areas the computer is unable to process. My computer is 2014 ...
398 views

I've created a displacement map which is based on the height of the mesh. The problem is that by the nature of this organic texture there is some self-intersecting geometry. I don't believe this can ...
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### How to make a golden isosceles triangle spiral/fractal, and its associated scaffold, with iterable depth?

Any way to control the fractal depth while having both the spiral and the triangular scaffold as separate objects so that they can be manipulated together or separately. I'm interested in this exact ...
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### Geometry nodes: is there a way to create a centerline of a closed curve/mesh?

See above image for a reference. For this kind of closed curve I would like to create a centerline. I have previously worked with an extension in Inkscape which creates a centerline but it is cutting ...
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### Self-intersecting geometry removal

I'm working on a number of icons for 3-D printing. I'm having an issue where I've traced out the object as linked edges and vertices, and then gone through the following process: Convert to curve. In ...
454 views

### Artifacts when rendering irregular mesh in Cycles (black lines)

when I render with Cycles any mesh (specially planes) with a bit of irregular shape (by using previously, for example, a displacement map) some black lines appear on it. Those black lines are not ...
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### Separate distinct internal closed volume (automated)

I have an object containing multiple interior faces defining closed volumes. I'm looking for a way to identify each of those volume and separate them in different objects. The object is in "one ...
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### How to create topographical contour lines ?

I am working on engraved cave walls, got from 3D scan. I would like to create topographical contour lines (maybe not "lines" but "ranges" ...) in order to see better the engravings. I have already ...
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### How to read the value through Python from Geometry Nodes Output Node

When the socket is not connected to other nodes, the script can be read into its variable. Everything is fine. ...
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### Get edge slope/angle of depression in mesh

I’m looking to write a script that is able to produce each edge’s change in height between its two vertices so that I can export the data to an external file. I am using a model of this mesh as a ...
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### "Masonry" alignment of 2D or 3D objects of various sizes using geometry nodes

i would like to take a collection of image planes, for example, or 3D objects of various sizes and instance them in a "masonry" style distribution pattern based that arranges each instance ...
38 views

### How to shade a mesh according to UV distortion / mesh size?

I'm trying to create a reasonably-accurate article of clothing for a character. Unfortunately, cloth simulation is... very challenging for this particular case, and while I am using some simulation as ...
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### Intersecting Boolean Not Working

I used to use C4D, but have moved to blender since it is free. I am trying to recreate a 3D printing project I had done in C4D but am struggling. (I am using Mac btw. Idk if that’s important) I am ...
228 views

### Thicken walls in geometry nodes properly, accounting for concave corners

I have run into situations where I wanted to do this multiple times now, but I have yet to find a way to do it. Lets say I have the following geometry, generated using geometry nodes: And I want to ...
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### Calculate the circumference of an irregular shape

I watched your video "100+ Tips to Boost Modeling in Blender", it's great, I couldn't pick it up. I am involved in a humanitarian association. I am an ortho-prosthetist and I make 3D ...
64 views

### Aligning dominos onto any Curve with GN

I'm trying to create a setup with GN to align dominos on any curve, that follows the direction AND the tilt of the shape. So far, it works with simple shapes, but as soon as I try to add tilt to the ...
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### Displacement makes geometry visible even with shade smooth set

I'm trying to apply voronoi noise displacement to a mesh. See Below, I have a very simple shader node setup. With shade smooth set, I can still see the mesh geometry, which looks pretty bad. I've ...
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### Aling two dodecahedron on their faces

I am using blender 2.93.5 and I am using the extra objects plugin to create those dodecahedrons. I want them to align exactly (position and rotation)on one of their faces so that everyone of the five ...
96 views

### Use Two Circles to Bend a Cylinder's Geometry in an Animation?

Is it possible to control the shape of a cylindrical cone using two bezier circles? (See GIF) Currently, I am using two hook modifiers that connect all of the vertices of the cylinder to two separate ...
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### Modeling irregularly shaped flower bed

I'm looking to model this flower bed which is a slightly atypical shape. I would quite like it to be as realistic as possible but only have a 4gb nvidia card so realise i might have to balance. I'm ...
359 views

### Creating rough mesh colliders for objects in Unity

Hello fellow blender users, I'm working on a big scene in a science project, a city with over 200 houses, streets, walls, and all that good stuff that's appearing in a city scene. The whole scene gets ...
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### Geometry Nodes - Point Cloud from custom XYZ coordinates?

I'd like to create a point cloud using the Geometry Node Editor based on my own custom data. The data is stored in a .txt file, plain [x,y,z] coordinates and looks like this: ...
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### Overlapping faces in imported .obj file

I've imported a model I made in Zephyr, and the model looks quite nice, except for these strange overlapping vertices/faces all over the place. Looks like blender just doesn't know what to do about ...
1k views

### How do I only select vertices which are visible from my perspective in 3D View?

I'm trying to retopologize a high poly mesh and create a low poly version out of the existing sculpt. While selecting some vertices of my low poly mesh in order to edit them, other non-visible ...
98 views

### What is the theory behind loops? How can I select the entire edge loop in this case?

I fail to develop an intuition when it comes to the working of loops in blender Geometry created from manipulating a cube, all the faces are quads All the inner loops are continuous, in both the ...
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### How do you know what will make the boolean modifier work?

The green mesh and the blue mesh are identical except the green one started out as a 3mm diameter cylinder and the blue one started out as a 6.5mm diameter cylinder. I hate to say it this way because ...
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### How to make a spiral torus?

How to make a spiral torus as shown below? I do know how to make various spirals in Blender, but this one escapes me and makes my head spin (forgive the pun). I believe it consists of several torus ...
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### Separate mesh into separate batches with python

I am working on an export / import addon for a custom model file format which stores its geometry in the so-called "render batches", the structures aimed at optimizing geometry for effecient live ...
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### Bind and apply SURFACE_DEFORM modifier without bpy.ops?

Is there a way to bind a surface deform mod without running bpy.ops.object.surfacedeform_bind(modifier="Surface Deform") and is there way to apply it without ...
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### split edge at multiple points without distorting uv or other data

Here's a bmesh edge: +-----------------------------+ Say I want to cut it at multiple points, in the middle and 3/4 from the end like so: ...
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### Remove intersecting geometry from wire

I try to render an image of a model made of optical fibre. I create it by extruding a cirle along a path. When I apply a glass material I get a very dark render image. I think this is caused by ...
1k views

### How to apply rotation and scale, avoiding shifting of the vertex parented objects?

In my scene I have a lot of elements that are connected to each other via the vertex parenting. I forgot to apply rotation and scale to those elements, but it is necessary so that I could correctly ...
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### How do I remove redundant triangles?

I finished creating my mesh, and one of the faces looks like this: But then when I export it, instead it ends up looking more like this: Now, I'm aware that this face is not really a rectangle and ...
802 views

### How to intersect two planes?

I am trying to use the geometry.intersect_plane_plane function, but I can't use the results properly. On this tryout, we have two points (...
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### How does blender calculate the catmull-clark subdivision mesh including edge creases?

A basic description of the catmull-clark subdivision algorithm can be found here and on this page (it seems that blender does not differentiate between corner and side case - tested with this python ...
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### Combine depth images from two cameras using the world matrix

In my simple scene I have a very simple model and two cameras. From each camera I know the external parameters Pi (from bpy.data.objects['Cam0'].matrix_world) and ...
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1 vote
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### Fill Select tool

Any idea how i can select inner polygons on this screenshot? I'v seen a video where a guy used "Fill Select" and i wannna know if its an addon or not. link on the vid with the timing: https:/...
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1 vote
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### Weird inner geometry showing when I deform mesh in Pose Mode

My armature is working as normal except for the fact that there's a weird tube thing inside the geometry that only shows when I bend parts (in the image I'm bending it at the elbow and the tube starts ...
1 vote
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### I need to rotate a face created using I without effecting the geometry of the other vertex of the object

I am creating a human figure for animation following series of you tube tutorial from 'Blender Character Modelling Tutorial - Body Modelling for Beginners'. While I am doing the hand, I manage to ...
1 vote
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### there is a gab in the donut icing however i increased the geometry and also the thickness with the solidfy and sub devesion modifires

i applied a subdivision modifier as well as solidify but when i used the proportion editing tool to move the vertices downward a gap was caused, and I tried to increase the thickness and that did ...
1 vote
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### In Geometry Nodes, how to Loop Cut (or Subdivide along one axis only)?

Is it possible to do the equivalent of a Loop Cut in Geometry Nodes? I don't see a Loop Cut node, nor a way to subdivide a mesh along a single axis. Ultimately what I'm trying to do is this: I have a ...
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### Proximity of empty to affect nearby points on faces (Geometry nodes) Blend V 4.0

I am having a bit of difficulty with the geometry proximity of an empty and having it affect points distributed on a mesh. When I alter the points offset, the entire set of points move and not only ...
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### How to model the inside corner of where two curved walls meet?

I'm pretty new to 3D modeling and Blender and I'm trying to make a modular tileset which includes walls. I'm stumped at exactly how to shape the inside corner where two of my curved walls meet. The ...
1 vote
50 views

### how to smoothly fold a curved plane over a curved edge?

Hi guys, I'm very new to Blender and I'm trying to model this little seat I made (just a rough prototype so pls ignore how scrappy it looks haha) but I just can't figure out how to fold the edges of ...
1 vote
59 views

### Blender Geometry Nodes Collection instances scale

I´m trying to find a way to scale the proximity geometry mask with collection objects. I would scale the object inside the collection and the mask would always be 2x the size of the object scaled (...
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1 vote