# 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.

317 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
104 views

### 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 ...
• 6,469
1k views

### 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 ...
379 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 ...
• 18.8k
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 ...
• 53.2k
46 views

### 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 ...
• 465
117 views

### 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 ...
• 127
5k views

### 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 ...
437 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 ...
• 31
622 views

### 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 ...
• 655
906 views

### 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 ...
• 31
24 views

### "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 ...
30 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 ...
• 322
73 views

### 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 ...
49 views

### 3D inverse opaline structure - Geometry Nodes?

I'm trying to build on the previous questions asked: 3D Inverted structure and How can we create this gold nanoparticles structure? Here, I am looking to create a slightly more complex 3D inverted ...
186 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 ...
• 97
201 views

### 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 ...
61 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 ...
• 31
160 views

### 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 ...
• 21
53 views

### 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 ...
89 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 ...
• 153
90 views

### 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 ...
325 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 ...
• 21
2k views

### 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: ...
135 views

### 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 ...
89 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 ...
• 151
23 views

### 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 ...
• 363
544 views

### 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 ...
• 434
649 views

### 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 ...
• 677
468 views

### 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 ...
• 797
34 views

### 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: ...
• 371
93 views

### 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 ...
• 2,667
597 views

### 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 ...
792 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 (...
580 views

### 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 ...
• 9,846
578 views

### 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 ...
• 335
1 vote
37 views

### 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 ...
• 1,584
1 vote
30 views

### 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
24 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
33 views

### Extrude the faces near my selection

I have made a good selection in geometry nodes that I'm happy with: I feed it into the extrude node, and I can extrude the vertices and edges using that selection correctly, but when I try it with ...
• 86
1 vote
64 views

### Geometry Node - Force UV Unwrap orientation

I'm using UV to project a grid of point on my mesh to create a rooftile. However, sometimes the UV unwrap node gives me UV that are not oriented properly. They are tilted. The Pack UV Islands rotate ...
1 vote
24 views

### Merging bordering curve objects together

I'm trying to make a 3D map from an SVG file using US counties and states. I've imported an SVG of all the counties into blender and have them as separate objects in the scene like so: What I'm ...
1 vote
72 views

### How to use geometry nodes to generate a 2D array of cubes with random heights (integer 1-4) and make adjacent cubes have different heights?

I used the Grid node to generate a 2D lattice, adjusted the lattice height and cube height based on random integer numbers, and then used the Instance on Points node to generate a cube array. But how ...
1 vote
45 views

### How to fill a 2D area with N 2D quads of different shapes but same area?

I have a 1000 m² N-gon of a curved shape. I want to cut it in 100 10 m² pieces and have a look at different variants of filling. Like manually changing the shape of one piece and have other pieces ...
1 vote
59 views

### Realizing instances generated with geometry nodes while preserving rotation

Hi everyone, I created geometry nodes and want to export them in gltf/glb format (to use with three.js). The important thing here is that as a result I need to have many individual sprinkle meshes ...
1 vote
44 views

### Geometery Nodes N Ripple Flow

Can someone point me in the right direction of going about creating a ripple effect that can be applied to a mesh that allows the object to be stationary and still project a ripple in a desired ...
• 317
1 vote
366 views

### Height map from image geometry node position

I'm making a flat mesh using a plane and geometry nodes. I am using a heightmap that I generated to displace the z for points on the mesh. However, the image is being transformed into a square and not ...
• 13
1 vote