443 questions
1
vote
0
answers
59
views
Need help to multi-thread in my Minecraft clone
I am currently creating a Minecraft clone in C and OpenGL. I have implemented a chunk loading system however this would result in freezing as new chunks are loaded as the main thread is having to wait ...
- 73
0
votes
0
answers
30
views
How will the shader differentiate the loaded brickmap from the unloaded brickmap as described in this voxel ray tracing paper?
I'm referencing a 2015 paper titled Real-time Ray tracing and Editing of Large Voxel Scenes by a student at Utrecht University, Thijs van Wingerden (link to paper).
I'm trying to build a voxel engine ...
0
votes
0
answers
24
views
Error when applying physics in LWJGL 2.9.1
I am practicing doing a project on a voxel engine, and I have a bug when running the program, I simulated physics to the camera and generated a chunk in the position of the camera, but from time to ...
0
votes
0
answers
22
views
How to disable infinity sky ray in ray tracing?
I am learning how to render voxels using Unity. I created a simple shader using the 3D DDA algorithm.
When I look at the ground I have 80-200 fps depending on the landscape and distances.
But when I ...
- 1
0
votes
0
answers
34
views
Trouble with rendering a voxel octree with ray-aabb intersection tests
This is the related code running on the gpu, written in wgsl.
The render looks less detailed and the voxels appear bigger then they should.
This is what my render looks like:
And this is the render ...
- 63
1
vote
0
answers
32
views
map bilinear sampled features to voxel back
I am developing a class specifically for bilinear sampling. My goal is to map the features extracted from the bilinear sampling process to the appropriate locations within a created voxel grid.
...
- 45
0
votes
1
answer
72
views
What is wrong with my voxel terrain generator. Terrain generator is not making seamless terrain
So as the title says, I'm making a voxel engine using rust and bevy and I am currently working on the terrain generation. I decided to use a heightmap that was made using simplex noise. This is how a ...
- 31
0
votes
0
answers
44
views
Voxel Memory Management
I have a query about voxel memory management, I wonder what is the most efficient way, considering the size, to store chunks on disk.
My current engine generates a chunk size of 32^3, and I've built ...
0
votes
0
answers
29
views
Atomically allocate a node in a sparse voxel oct tree
I am running into a tricky situation. I have SVO and I am trying to allocated nodes to it in a multithreaded setting. The representation I have is, in pesudocode
Node {
data,
children: [u32; 8]
}
...
- 9,470
0
votes
0
answers
15
views
Lmervoxel - Error in eval(predvars, data, env) : object 'voxel1con_images' not found #1
I'm trying to run the function lmervoxel on SPM-generated 1st level contrast images. I keep getting this error and I don't know where this variable "voxel1..." comes from. I input con_images ...
0
votes
0
answers
185
views
Counting points in an open3d Voxel
I'm trying to count points inside a VoxelGrid's Voxels with little success. After a long debugging session and reading this thread my issue is most likely with the different indexing in the ...
0
votes
1
answer
512
views
Why using Open3D for solid voxelization cannot achieve ideal results
I am currently learning voxelization algorithms using Open3D. I want to voxelize a triangular mesh model using a spatial sculpting algorithm. Below is the code for voxelization. I used a dragon model ...
user23620257
1
vote
0
answers
15
views
Abstract Error when opening QB file in Qubicle with my compression logic
I have finally resolved this thread where I made this QB writer but now I'm trying to apply RLE compression based on the Qubicle documentation but I don't know what I am doing wrong. The following ...
- 121
0
votes
0
answers
38
views
How to convert multiple single-channel 2d images to 3d volume and keep the Z-axis spacing?
I have multiple images taken from the microscope with different Z-axis planes and converted them into single-channel images, and now I want to convert these single-channel images into 3d volume, but ...
- 15
0
votes
0
answers
68
views
Why isn't my chunk loading and unloading function working
Here's my code for chunk loading, unloading, the update world function, and voxel stuff
void generateVoxels(Chunk *chunk) {
chunk -> voxels = (Voxel *)malloc(sizeof(Voxel) * CHUNK_SIZE * ...
1
vote
0
answers
56
views
How to achieve solid voxelization of point clouds and triangular meshes
The surface voxelization algorithm for point cloud and triangular mesh models (which are enclosed) has been implemented, and the surface voxel model of the model can be obtained. To implement the ...
user23620257
0
votes
0
answers
54
views
World moving algorithm doesn't work as intended
So I'm working on a voxel engine in C++, and I've put together an algorithm for moving the world based on a new position (only in the +x/+y direction). It works as follows:
Allocate a buffer for ...
- 13
0
votes
0
answers
15
views
How to estimate the memory size of a binary voxelized geometry?
Say there is a 3D geometry in a box with N^3 elements or voxels.
How to estimate the memory size of the voxelized geometry given that the elements are binary (1 or 0)? Is it simply N^3 bits or is ...
- 359
0
votes
0
answers
50
views
Prevent Matplotlib voxels from shading facecolors
I use voxels on Matplotlib. I would like to display a cube, but without shadows on certain faces. I want all faces to have exactly the same color. I browsed the documentation but didn't managed to ...
- 1
1
vote
2
answers
127
views
How to use Viktor Ferenczi's Godot Voxel addon?
[This is the addon][1]
It seems like the only voxel addon that could make my project work long-term, but I don't understand how to use it.
As I understand, I have to use this python tool inside the ...
- 57
-2
votes
1
answer
82
views
3d array data in json file, I want to read the content in C# unity
jsonfile content: {"values": [[[1.0, 2.0, 3.0], [4.0, 5.0, 6.0], [7.0, 8.0, 9.0]], [[10.0, 11.0, 12.0], [13.0, 14.0, 15.0], [16.0, 17.0, 18.0]], [[19.0, 20.0, 21.0], [22.0, 23.0, 24.0], [25....
- 27
1
vote
0
answers
355
views
How can I declare an enum in wgsl?
I am trying to raymarch through a voxel octree on the gpu so I'm tyring to use an enum:
enum Node {
Empty,
Filled(ShaderVoxel),
Group(array<Node>),
}
But this is telling me this:
...
- 63
2
votes
1
answer
146
views
Voxelization Issue with Open3D: Incomplete Filling Along Some Triangle Faces
I'm currently using Open3D in Python to voxelize meshes, and I've come across a peculiar behavior during the process. When voxelizing a box mesh, it appears that the resulting voxels only align along ...
- 51
0
votes
0
answers
91
views
faster way to iterate through a chunk of voxels in rust?
so i am making chunks of voxels (128x256x128) and need to iterate through those positions to first create the voxels:
for x in 0..=width {
for z in 0..=depth {
let noise_value1 = noise.get(...
- 63
0
votes
1
answer
90
views
Determining voxelized .json file format
I don't know if this forum is the right place to post this question. If not please point me to the right place.
I come across a .json file format that contains voxelized information from this project ...
0
votes
1
answer
100
views
Trying to insert a sphere defect (.ply) into an object (.obj) using Voxel Method bypassing Airspaces and Vertices using the open3d
get_voxel_center() doesn't work in the code below:
import open3d as o3d
import numpy as np
def main():
# File paths for the try.obj and sphere.ply files
try_obj_path = '/Users/xd_anshul/...
0
votes
1
answer
168
views
Can I access the mesh output of a mesh shader back to CPU?
So I’m making a voxel game in Vulkan where the bulk of the computation is not only in rendering the faces of each block, but also generating those blocks as in terrain generator. After hearing all the ...
- 303
0
votes
0
answers
13
views
Function to find points along a vector line in a CT image
I need to find the points along a vector line in a CT image. I am trying to find the voxels (3D pixels) that contain the skull in that particular vector direction. This can be done using line equation`...
- 11
1
vote
1
answer
1k
views
Creating VoxelGrid using Voxels (Open3D)
I'm using open3d to voxelize two point clouds, then color the voxels based on the point count difference for each voxel. I do this by creating 2 VoxelGrid objects using o3d.geometry.VoxelGrid....
2
votes
1
answer
327
views
Is there a way to save a point cloud voxelized with Open3D in a format supported by Unreal Engine?
Issues with Voxelization of Point Clouds in Open3D and Saving in Non-PLY Formats
Background
I am currently working on voxelizing point cloud data for utilization within the Unreal Engine. However, I'm ...
- 65
0
votes
0
answers
120
views
Is there a way to fill the gaps in a voxel representation of an STL file of a hollow tube?
I am using Open3D to transform a stl file from a mesh to its voxel representation to run a simulation. However, when I do the transformation there seems to be gaps between the voxels and I want it to ...
- 11
0
votes
0
answers
164
views
Generation a Heightmap using Mesh Face_normals Elevation in Pyvista
So, to explain the context ! what I'm trying to do is to generate a heightmap of a Voxelized Buildings mesh, to do that I tried getting the upper faces and their cell_centers so I can use each ...
- 3
2
votes
1
answer
444
views
Visualizing 3D video sequence in python
I have a stack of 100 images of size 300 x 300 which represent a 3D volume. I have another 100 of these 3D volumes as a sequence. I have been trying to visualize this 3D image sequence data as a video ...
- 899
0
votes
1
answer
388
views
Stray Voxels after mesh Voxelization using Pyvista
I've been playing around with the Threejs BufferGeometry and Pyvista.
I was able to export it to Pyvista, the visualization of the mesh works just perfectly :
Normal Visualization
but I when I ...
- 3
0
votes
1
answer
461
views
Computing persistent homology Betti numbers on big data
I have a huge 3D big data (128×128×128). I want to compute the Betti numbers for this 3D data. I tried using the moguTDA and ripser packages from Python and my kernel dies when I try computing the ...
1
vote
0
answers
112
views
Voxel Engine Block Placement
so I was basically wondering if there'll a way to turn block coordinates into it's chunk coordinates. Because right now I only have the block placement functionally working in one chunk, which is at ...
0
votes
0
answers
182
views
glutWarpPointer() does nothing in my program
I have been trying to create a simple voxel game with Glut, and everything is working great except for 'glutWarpPointer()' that does nothing at all, the cursor is not altered in any way and I have no ...
- 1
2
votes
0
answers
104
views
Why Open3D's VoxelDownSample behaves differently for legacy and tensor point clouds?
I noticed that VoxelDownSample behaves differently for legacy and tensor point clouds.
For legacy point clouds, all points that fall into single voxel are averaged. Howewer, for tensor point cloud all ...
- 21
0
votes
0
answers
42
views
How to optimize the for-loop code for drawing voxel-respresented spheres from given sphere coordinates?
randPoints is a list of 10,000 sets of (x,y,z) coordinate
xx, yy, zz are the product of meshgrid and have the shape of (201,201,201)
for j in range(len(randPoints)):
#prepare coordinate x,y,z
...
- 1
1
vote
0
answers
24
views
three spatial dimension density plotting in R
I have a data set
x and y are horizontal spatial coordinates, z is the vertical spatial coordinate.
The data set is individual entry:
x1,y1,z1,obsevervation_Data1
x2,y2,z2,obsevervation_Data2
etc....
...
- 11
0
votes
0
answers
717
views
unity job system can not use classes
i am triying to use the unity job system with marching cubes.
here is my job:
private struct UpdateChunksJob : IJobParallelFor
{
public NativeQueue<NativeChunk> queue;
...
0
votes
0
answers
138
views
How to pass a 3D grid of voxel into a fragment shader in webgl
i want to make a voxel engine in javascript using webgl api. But i don't know to send to the gpu a 3D grid of voxel. I know of work voxel engine so there is no need to give me paper about how to ...
- 37
1
vote
0
answers
87
views
Seamless Textures in Voxel Worlds
I've been working on a minecraft clone recently and I've been able to generate simple infinite worlds with some noise for height Maps etc but the problem I'm facing are the textures. As you can see in ...
0
votes
1
answer
298
views
Unity - Voxel Mesh Sphere from Cubes
Trying to generate a sphere made of cubes like so:
This was easy, but any sphere of significant sizes has obvious performance issues if each cube is a separate gameobject, especially if the sphere is ...
- 25
0
votes
0
answers
75
views
Determining Color of a Voxel in Python
I am working with MRI data and would like to determine the RGB value of a given voxel. Can anyone show me a clear way to do this? Thanks.
this must be something that's extremely easy to do because I ...
1
vote
1
answer
677
views
undefined reference to `pcl::PCLBase<pcl::PCLPointCloud2>::setInputCloud(std::shared_ptr<pcl::PCLPointCloud2 const> const&)
I'm trying to use the VoxelGrid of the pcl library to filter my PointCloud, extracted from a ros message. So the following is the part of code related to this problem:
pcl::PCLBase<pcl::...
1
vote
1
answer
1k
views
Display 3D image given a numpy array of size (64,64,64) where each element represents the intensity(0-1)(grayscale) in 3d space
I am trying to do a 3D reconstruction project using GANs and trying to check my output #which is a 64,64,64 numpy array. However I cant find a way to display the numpy array.
Tried something like
...
1
vote
1
answer
977
views
how to convert binary voxelgrid (numpy 3d array) to open3d voxel format?
I have the 3d array np.zeros((24, 24, 100)), fill it with some '1's,
and can visualize it (in 3d) using pyplot:
open3d is more suitable to view this in 3d, and update it realtime, so I want to ...
- 120
0
votes
1
answer
123
views
Why won't the turtle draw anything?
I was trying to make a voxel engine using the turtle library in python, but when I run it, nothing happens. I've tested it and altered most of what I thought the problem was, but I still can't figure ...
0
votes
1
answer
198
views
How to find the coordinate of the center of a sphere made in 3D by voxels given all the coordinate of the voxels that made up the sphere
I have coordinate of all the voxels that make up the sphere
C = [[x1,y1,z1],[x2,y2,z2],...,[xn,yn,zn]] (around 4000 coordinates)
Please teach me how I can get a coordinate that is the center of this ...
- 1