Questions tagged [point-clouds]
questions concerning the use of point clouds / data point sets in blender.
121
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Accessing point cloud data via python API
My object is originally a spherical MESH, and it is transformed into a point cloud using several geometry nodes (mesh to points, raycast, etc).
Then I would like to access the data associated to this ...
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0
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27
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Draw a colored point cloud from csv file
I have a 150000 rows CSV file with x, y, z coordinates and a category column (with values "A", "B", or "C") for each point. I want to create a point cloud visualization ...
2
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1
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43
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Problem with closest_point_on_mesh when the closest point is on an edge
I'm trying to generate a point cloud representing the volume of an arbitrary mesh. My approach is to create a uniform grid of sample points within the object bounding box, and then call ...
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7
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Filtering out the point cloud in specific range
I have a problem to be solved. Can someone please let me know how to achieve it? I have generated a 3D structure of an object with the help of an open source software "Mesh room".The file ...
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47
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Is there a (performant) way to raycast on points?
Importing a .ply file will be a Mesh with vertices for each points, but no edges or faces. To render this pointcloud, one has to create a geometry node setup like this:
Here is the problem/goal:
I ...
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20
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How can I Export Cloud Point Positions to a Spreadsheet from Mesh Volume
I have been trying to obtain the cloud points data. I convert the mesh into a volume and distribute the cloud points within the volume. Here is what I am doing:
I am wondering if there is a way to ...
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1
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61
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How to combine two texture in geometry nodes after a Distribute point on faces node
My first objective is to have a point cloud from a 3D scan with some points glowing.
Everything is working; the color of the points comes from my texture. However, when I want to add a second material ...
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2
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3
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138
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Use multiple image texture frames in Geometry Nodes
I have a depth map / point cloud, represented as a sequence of images (2D layers). They are layered spherically from a centre point, like an onion.
I'm trying to reconstruct the point cloud using ...
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25
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How to add color to a black & white 3D laser scan (.wrl) file imported into blender?
I imported a 3d point cloud into blender .wrl file. The scan was without color just black and white. The image shows the point cloud, I want to add color to it, but not sure how I would do this.
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70
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Camera projection with geo-nodes
I’m trying to create camera projection with geo-nodes to store image color on point cloud color attribute, but I’m not into trigonometry at all.
What I’d like to achieve is this:
But with geo-nodes - ...
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1
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71
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Can Particle System caches be accessed directly by Geometry Nodes?
My goal is to instantiate objects on the points of a particle system.
Right now, my workflow is:
tweak the parameters of the particle system
export it as an Alembic cache (point cloud?)
import it ...
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0
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114
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Point cloud texture mapping
I imported a mesh 3d scan and made it into point cloud model using geo nodes mesh to point, the 3d scan comes with a file of texture, which is about 12 pages of texture map like I showed in the image, ...
3
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1
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111
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How can I create a static "particle cloud" within a fixed volume?
The task
Ok, so, the title of this question is relatively abstract, but what I would actually like to do is pretty specific. Yesterday, I asked in a post over at graphic design, how I could recreate ...
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65
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How to make 3D model from spot elevation geodetic map
I need help, and I could not find the answer anywhere, so if anyone knows how to do it, please tell me.
First of all, I know there are probably better tools to do this. But I would like to do it in ...
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1
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854
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How to visualize point cloud colors in Blender 4.0 after PLY data import?
Given the following data set which stems from the export of a photogrammetric scan:
...
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81
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Geometry Nodes - Optimizing mesh instancing on a patchy grid
I have this generated selection of points that I'm instancing meshes onto, they are in a grid pattern but not all spaces on the grid contain a point.
What I want to ask is if it's possible to cycle ...
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41
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Geometry Nodes Points (and instances) not showing in a small sized objects
I'm working in a really small sized object with real scale size (about 13 mm length object) and I make a distribution node tree to put some tiny rocks distributed in part of the model. All transforms ...
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33
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How do I export this model so that it is is one object using one material?
I downloaded this model from SketchFab
https://skfb.ly/oLsvy
and I want to turn it into a point cloud. However the way I usually do this is by assigning a material with a single image texture on one ...
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158
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Rendering of PointCloud not working
I managed to get a point cloud into Blender 3.6 and wanted to render a view port image. But all I get is a black screen. It happens since I changed the size of the radius in the "Mesh to Points&...
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153
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How to export the point cloud coordinates created by the geometry node "distribution points on faces "?
Tried everything I could but cannot find a solution to export it in python code!
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2
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286
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GeoNode "Points to Curves": how to make curves for each distinct vertex group in mesh
I am newbie in geonodes and, after some googling, I still do not know how to find answer to my question.
My data: Mesh, made of vertices only. Each vertex is assigned to Vertex Group, therefore ...
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13
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XYZ-Property Point Set Export [duplicate]
Is it possible to export an ASCII/CSV file (or use python,) to obtain the X, Y, Z and colour property for a regular 3D mesh? If so where are the points referenced to? The corner or centre of cell? ...
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82
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Lidar point cloud and ambient occlusion shading
I'm trying to replicated the way sketchfab visualizes lidars. The color of each point seem to be determined by some kind of ambient occlusion technique.
What I tried:
Tried plugging an ambient ...
3
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1
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769
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Geometry Nodes: Phyllotaxis using Repeat Zone as a For loop
I would like to make a pattern of points following a phyllotaxis (like on a sunflower).
The algorithm I use is:
...
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202
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How to handle the huge point cloud with Geometry nodes? [closed]
I am working with the geometry nodes to handle some amount of points generated.
However, blender becomes very slow when the points amount is big.
I am thinking if I can handle the points batch by ...
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1
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How can I convert a complex point cloud to mesh?
I come from this question where I have generated a Point Cloud from a simple script which I want to convert into a mesh. I see there is this question and this question, which was unfortunately marked ...
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1
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192
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How do I get a "correct" isosurface from points to volume to mesh workflow?
I am a computational chemist, looking to visualize an electron density in blender. The density is basically a 3D-array with a value assigned to each point. I managed to load the density to blender, ...
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83
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transfer field from point cloud to mesh
I want to transfer float attributes/field from this point cloud, with this float attributes distribution.
To this mesh, where vertices of the mesh have the same count/position as point cloud.
If I ...
0
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2
answers
535
views
Remove sections of a point cloud with Geometry Proximity or any other node setup
I am trying to create slits in this point cloud model (.ply filetype). The geometry I would like to use to delete the slits in the point cloud is a plane with an array modifier (to control the ...
0
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1
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221
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Turn 2D shape into a Point Cloud
A project I'm currently working on requires turning a 2D shape (simple but random 2D shape, typically a face extracted from another object, can be tilted) into a Point Cloud of some specific specs (...
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598
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Geometry nodes: get line's point global coordinates
Somebody, help me please.
I want to bend the curve at any point. So I separate it into two parts and than I try to rotate one around the point of separation. But I cannot get the correct coordinates ...
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0
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47
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Is it possible to chang geonodes Extrude Mesh for a face "Origin" to other position?
I'm using Blender 3.4.1. I'm learning geonodes. I wanted to use Geo Proximity to control Extrude Mesh on different faces. But I find that some face like "L shape" has the origin point in the ...
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252
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Blender PLY export makes Vertex Colors darker
I wrote a Python script that exports Pointclouds (only vertices) and their vertex-colors (stored in color_attributes) to a .PLY file. The color on the exported .PLY file is way darker than the ...
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827
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How to correctly import whitewater particles from fluid simulation (FLIP fluids)?
I exported a FLIP fluids simulation to Alembic (.abc) and imported it into another blend file.
The fluid itself works fine however the whitewater particles are not visible.
According to the docs, I ...
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2
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551
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Create new objects in a scene from point locations?
I'm using Geometry Nodes to generate a set of points within the volume of a mesh (a human character in this case), with the hope that I can take these points, export them into Unity, and use them as ...
0
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0
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149
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How to get point cloud produced by GN modifier by python?
I create a empty mesh and create many points in PointCloud and want to write a addon to export them, how to get them by python? i find the point cloud type doc, but don't get the api to get them:
...
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1k
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How to generate Points (x,y,z) model from a 3D model using Blender
I am a newcomer to Blender.
Briefly, I want to generate Points (x,y,z) model from a 3D model using Blender. And use these points to do numerical simulation.
These points should be not only on the ...
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0
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131
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Exporting PLY - No difference between moving object and moving its origin?
I create models in Blender, export them as point clouds and use them in another project.
Today I wanted to test the following use case and I am surprised that the exported ply file looks differently ...
- 111
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0
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367
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How do I keep the Random Value node static on changing geometry? [closed]
I have an Alembic point cloud I'm trying to render as grains, but the random size keeps changing every frame because the point count isn't static. I guess I could use the seed input, but I have no ...
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2
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1
answer
4k
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Rotate instances to face one object with Geometry Nodes
I've created a dense forest of plane image trees using Distribute Points on Faces and Instance on Points nodes.
I'm attempting ...
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2
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2
answers
485
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Object instance on single point using vertex group. Blender 3.2.2
I'm a complete noob with blender and just started learning geo nodes. I'm following this tutorial https://www.youtube.com/watch?v=GHGokQoqVb8&t=421s and I know it's for an old version of Blender ...
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78
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Blender rendering changing required data colour (red to magenta)
I am using Blender to create a 3D model of a location/building with data points demonstrating the data values through their colour. Red is negative, white is zero and, blue is positive. I imported the ...
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4
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1
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655
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Filter point cloud based on proximity to another point cloud
I'm trying to build a nature scene with geometry nodes, and I want to make sure that plants aren't exactly on top of each other. For example, I don't want grass growing inside of trees and sticking ...
0
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1
answer
654
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Getting colored point cloud sequence into Blender
I have motion capture data in the form of a colored point cloud that I would like to get into Blender. The export options from the MoCap program are:
I have been trying desperately to get the Alembic ...
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0
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46
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Render Point Density to Texture
Was curious if anyone knows of a way to render out a point density to a 3dTexture for use in a game engine?
Usually these are just rendered to a red channel and then imported into a 3d texture in ...
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3
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996
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how to combine vertices into a surface
I have an array of vertices from the .obj file. I transferred it to a blender . BUT I can't create the surface.
how to combine points into a single surface ??
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1k
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Can I apply UV texture map into Geometry Node points?
I'm making a coral. It has UV map image texture and I spread it out some points with Geometry Node on the surface of the mesh, and I wanted to apply my UV texture to points.
For instance, yellow ...
0
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1
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196
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How to import reference images to specific XYZ positions
Dears,
Scientific question:
I have a bunch of images taken from a microscope.
All images have XYZ coordinates of their real world position.
How can I import them into Blender via a script to have them ...
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4
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1
answer
303
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Is there any way to render a perfect curve just like pointclouds in blender?
When we use the 'curve to mesh' node in geometry nodes, sometimes we cannot get an ideal results because mesh overlap frequently happens and leads to bad shading on surface, just like this figure:
So ...
- 51
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0
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605
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Render Coloured Point Clouds as Collection of Spheres
I have a coloured point cloud in a .pcd file, that I can easily convert to a .ply file using Open3D. I would like to visualise ...
- 101