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BREP at a glance
BREP
Boundary representation became a core idea in 1970s and 1980s solid modeling, and Open CASCADE's .brep files reflect that tradition by serializing exact topological and geometric entities for native CAD workflows.
GLB at a glance
GLB
glTF and GLB grew after earlier interchange formats proved too heavy for many web and runtime delivery tasks, which is why Khronos now positions glTF as a transmission/runtime format.
Format comparison
| Feature | BREP | GLB |
|---|---|---|
| File type | Cad | Cad |
| Extensions |
|
|
| MIME type |
|
|
| Compression / quality | precise | precise |
| File size characteristics | depends | depends |
| Compatibility | limited | limited |
| Editability | high | high |
| Created year | 1996 | 2015 |
| Inventor | Open CASCADE Technology | Khronos Group |
| Status | active | active |
| Transparency | Not supported | Not supported |
| Animation | Not supported | Supported |
| Primary use cases |
|
|
| Common software |
|
|
| Archival suitability | moderate | moderate |
| Metadata handling | rich | rich |
| Delivery profile | limited | limited |
| Workflow fit | design | design |
| Layer support | Not supported | Not supported |
| Vector scaling | Supported | Supported |
| Structured data | Not supported | Not supported |
When to use each format
When to use BREP
- design authoring
- review handoff
- manufacturing exchange
- Preserves exact geometry and topology for solids, shells, faces, edges, and vertices.
When to use GLB
- design authoring
- review handoff
- manufacturing exchange
- Single-file packaging for glTF assets.
FAQs
Why convert BREP to GLB?
Choose GLB as target when you need a single-file 3D asset for web viewers, AR previews, real-time applications, product visualization, or engine import with minimal packaging friction.
What changes when converting BREP to GLB?
Convert to GLB when you need a single-file 3D asset for web viewers, AR previews, real-time applications, product visualization, or engine import with minimal packaging friction. It is often the best target for deployment-ready 3D delivery. Use GLB when compact transport and modern runtime compatibility matter more than human-readable source structure.
What should I review after converting BREP to GLB?
After conversion, review these destination checks: Open converted output in web 3D engines and verify behavior on real samples; Compare output against the expected precise quality profile; Not every authoring workflow keeps all rich edit semantics in GLB.
How can I keep quality stable in BREP to GLB conversion?
Run representative samples, keep settings deterministic, and monitor these risks: Often used as a delivery target more than a master working format; Not every authoring workflow keeps all rich edit semantics in GLB; Validate destination compatibility before large-batch conversion.