BlitzBasic 3D .b3d
Blitz3D’s model format. Hobbyist game development, early 2000s.
What a .b3d file holds
B3D is the model format of Blitz3D, a BASIC dialect with a 3D engine bolted on that taught a generation of hobbyists to make games. It stores meshes, textures, bones and animation in a compact chunked binary, and several open-source engines still read it.
Commonly seen in: Blitz3D, BlitzMax, Irrlicht, hobbyist engines.
| Data | Stored in B3D |
|---|---|
| Geometry | Yes |
| Materials and colour | Yes |
| Texture maps | Yes |
| Animation and rigs | Yes |
| Scene hierarchy | Yes |
| Read here | Yes |
| Written here | No |
Tested against a real file
The last sweep loaded WusonBlitz.b3d from Assimp test models through the viewer on this site: 3,732 triangles across 1 meshes and 1 materials, in 2.0 seconds. Every format's result is on the test results page, run 2026-09-08.
Convert B3D to another format
Every pairing has a page saying what survives the trip.
Other things to do with a .b3d file
Questions about B3D
How do I open a .b3d file?
Drop it into the viewer on this site and it opens in the browser, with the scene tree, the materials and the mesh statistics. Nothing is uploaded. If you want it in another program instead, convert it to GLB, which almost everything reads.
Is B3D a good format to archive in?
B3D carries geometry, materials, textures and animation, so an archive copy keeps nearly everything. The usual caveat applies: a format is only as future-proof as the readers that exist for it, and .b3d is well served.
Does converting B3D lose quality?
Geometry is copied vertex for vertex, so the shape does not degrade. What gets lost is whatever the target format has no field for: convert to STL and the materials go, convert to OBJ and the animation goes. The comparison table on each converter page says exactly which.
Formats that hold the same things
Or go back to the full format reference.