When comparing Paint3D vs VoxelShop, the Slant community recommends VoxelShop for most people. In the question“What are the best voxel editors?” VoxelShop is ranked 2nd while Paint3D is ranked 4th. The most important reason people chose VoxelShop is:
VoxelShop is available for Windows, OS X and Linux.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Affordable
Has a free trial version and a cheap full version.
Pro Scripting support
Can be used to generate models, import stuff, animate, etc.
Pro Can export traditional 3D models
Pro Interoperates with 2D paint programs
Pro Supports multiple voxel formats
Pro Easy to use
Pro Uses 32-bit color with real volumetric transparency
Pro Supports both "per voxel" drawing and smooth "sculpting"
Pro Cross-platform
VoxelShop is available for Windows, OS X and Linux.
Pro Free
VoxelShop is Open Source. You can download and use the software for free, but donations are encouraged to support the project.
Pro Great for game-dev
Exported .dae files are optimized to lowest possible amount of polygons. Despite lack of animation support .dae files can be imported to Blender and animated.
Pro Layers
Pro Export to COLLADA
Pro Exports optimized meshes
The export (to DAE files) removes unnecessary geometry, creating an optimized model.
Pro Palettes
Easy to go with a theme.
Pro Textured voxels
Pro Exports to kv6
Helpful for making larger voxels for Doom.
Cons
Con The web site's domain is no longer available
Using the WayBackMachine to get the site's contact email address, I attempted to contact the developer to find out what the story is. There has been no response. The WayBackMachine's last archive date for the site was 11Jan2016. Their cached version of the paint3D.net's forum does not have any post explaining what happened.
Con Website is no longer available.
Con Does not support .obj export format
Con Really buggy
Sometimes it crashes at startup, some large models instantly crash the program, having the mirror function on causes every action to get mirrored (even imports get mirrored).