Voxel Builder

screenshot

Voxel-based 3D Modeling Application

Model . Render . Export

https://nimadez.github.io/voxel-builder/

Changelog 
Installation 
Wiki 
Known Issues 
FAQ 
Bug Report

Features

File I/O

Save and load JSON
Save and load MagicaVoxel VOX
Export to GLB, GLTF, OBJ, STL, PLY
Localstorage, snapshots, quicksave, undo/redo
Backup and share snapshots in a ZIP archive

Model and Paint

High performance voxel engine
Generators (terrain, cube, sphere, isometric...)
Interactive modeling toolsets
Symmetric drawing and painting
Voxel transforms and manipulation
Color groups and layering options

Rendering

Three.js Sandbox
Three.js GPU path tracer
Basic PBR rendering
Post-process effects

Voxelization

Fast BVH method
Model voxelizer (GLB, OBJ, STL, PLY)
Image voxelizer
Text voxelizer (unicode & emoji)

Export Meshes

Bake voxels to editable meshes
Unbake exported GLB back to voxels
glTF compatible editor

Extensibility

ES modules
User startup project
Blender importer script

More

Average startup time 300 ms (after the first launch)
Unique handcrafted user-interface
Minimum dependency, portable, online and offline
Ad-free, no trackers, no logging

Supported Browsers

Electron (recommended)
Mozilla Firefox (desktop/mobile)
Google Chrome (desktop/mobile)

PWA A2HS-ready (add to home screen)

For the best experience, a tablet with pen or Wacom is recommended.

Installation

Clone or Download the repository

git clone https://github.com/nimadez/voxel-builder
cd voxel-builder

Download Electron

Linux:   electron-v*-linux-x64.zip
Windows: electron-v*-win32-x64.zip

For ease of use, extract the zip file into the "voxel-builder/electron" directory.

Run

Start with Electron

cd voxel-builder
electron .

$ sh run-electron.sh
> run-electron.bat

Start with Node.js

cd voxel-builder
node server.js

Update

Makes a backup archive, and ignoring the "/electron" directory.

cd voxel-builder
python3 update.py

Known Issues

Low FPS at higher voxel volumes

Electron is recommended for working with a large number of voxels. 
Also, the FPS depends on many factors, such as the material (CEL is faster) and the distance between the camera and the model. Rendering a dense Thin volume at close range greatly increases GPU load.

Use "Minimal UIX" to save battery on mobile devices. (PBR-free)

Do not enable the "Frosted Glass UI" option.

Use XFORM > Optimize to reduce the volume of voxels.

Note that this application runs on a web browser and you shouldn't expect much.

Delay in drawing strokes

If you draw and it doesn't, it means the builder is working, you are drawing faster than your hardware and browser will allow. (latency >150 ms)

Error: Exceeded the quota

Browser storage is limited, use Electron for much higher capacity.

Import GLB:

Attributes error (voxelization)

Multiple meshes need to have the same properties or they won't merge, the only solution is to merge meshes before exporting to GLB.

Morphtarget error (voxelization)

We do not support geometry animations.

Import PLY: Throw RangeError (voxelization)

They are often a piece of a larger model data.

Wacom tablet crashes randomly and throws warning on Chrome (Linux)

Warning: BJS - Max number of touches exceeded. Ignoring touches in excess of 2. This problem is related to Babylon.js and nothing can be done.

FAQ

Why isn't there a layering feature and a layer list?

You can have 16,777,216 layers (color groups), the layering system in this app is determined by colors, even a change in the brightness of a color creates a new group that can contain hundreds of voxels. 
So groups are automatically created, merged, or deleted based on color. You can even hide, delete, select, paint, transform, or duplicate color groups.

Why can't I freely transform 3D objects like in other 3D software?

There are no objects, you work with a grid of voxels, the XFORM feature only mimics the transformation of 3D objects, you just grab a piece of connected voxels and move them.

Can two voxels be in the same position?

Never, even if they have different colors, the system will automatically delete one.

Why isn't there an option to export raw voxels as GLB?

GLB has a special use in this application, you can save and retrieve voxel data using baked meshes, exporting raw voxels to GLB leads to interference and errors when loading it using the "Load Bakes" option.

What are the methods for saving and loading voxel data?

-- Save to JSON (includes scene configs, human-readable, fastest) 
-- Export baked meshes to GLB (uses 'Load Bakes', supports Blender and other 3D software, slower) 
-- Save snapshots to ZIP archive (easy to share, browser storage limits, speed is variable) 
-- Save to VOX format (supports MagicaVoxel, very fast)

Will WebGPU be supported?

It was supported to some extent before, but was removed due to unnecessary complexity. But once it matures enough to be enabled by default in browsers, this upgrade will be possible with a few simple changes.

How to merge vertices after export to GLB?

1- Open exported GLB file in Blender 
2- Go to "Modeling" tab and choose vertex selection mode 
3- Select all vertices (Ctrl + A) 
4- Mesh > Clean Up > Merge by Distance

How to run Blender importer script?

1- Save project to JSON 
2- Open Blender and go to "Scripting" tab 
3- Click "Open" and select "blender-importer.py" 
4- Run the script and select a JSON file

How to go back to the previous version?

git clone https://github.com/nimadez/voxel-builder
cd voxel-builder
git log -2 (copy the hash of the previous commit)
git reset --hard $HASH

History

↑ A fundamental overhaul of the core
↑ Core initialization!
↑ Rendering was left to Three and three-gpu-pathtracer
↑ ES6 (the original index.html playground was moved)
↑ x1.5 faster startup (2s to 300ms)
↑ Migrating to Linux: Firefox ready
↑ High performance GPU picking system
↑ Voxel engine updated to thin-instances (64k to 512k)
↑ The world moved (from 0.0 to 0.5 center to avoid 0.5)
↑ Real-time GPU path tracing
↑ Introducing ES modules
↑ Advancing to the next level (bakery)
↑ Changed default handiness to right-handed coordinate
↑ New SPS particles to build the world
↑ 2019 - I wrote a playground for learning Babylon.js

Version 3.0.0 (BJS 4) to 4.2.2 (BJS 6) 
screenshot

License

Code released under the GPL-3.0 license.

Credits

Available in Babylon.js community demos

Voxel builder