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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.
PLY at a glance
PLY
PLY is strongly associated with graphics research and scanned-mesh workflows rather than only with artist-authored content pipelines.
Format comparison
| Feature | BREP | PLY |
|---|---|---|
| File type | Cad | Cad |
| Extensions |
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| MIME type |
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| Compression / quality | precise | precise |
| File size characteristics | depends | depends |
| Compatibility | limited | limited |
| Editability | high | high |
| Created year | 1996 | 1994 |
| Inventor | Open CASCADE Technology | Greg Turk / Stanford Graphics Laboratory |
| Status | active | active |
| Transparency | Not supported | Not supported |
| Animation | Not supported | Not supported |
| Primary use cases |
|
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| Common software |
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| 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 PLY
- design authoring
- review handoff
- manufacturing exchange
- Good fit for mesh and property-rich geometry.
FAQs
Why convert BREP to PLY?
Choose PLY as target when handling scanned meshes, point clouds, or geometry with per-vertex properties such as color or normals that should remain explicit.
What changes when converting BREP to PLY?
Convert to PLY when handling scanned meshes, point clouds, or geometry with per-vertex properties such as color or normals that should remain explicit. It is a good target for research, reconstruction, and technical asset exchange. For broader DCC and runtime pipelines, OBJ or GLB may be more convenient.
What should I review after converting BREP to PLY?
After conversion, review these destination checks: Open converted output in mesh processing tools and verify behavior on real samples; Compare output against the expected precise quality profile; Not a rich full-scene format.
How can I keep quality stable in BREP to PLY conversion?
Run representative samples, keep settings deterministic, and monitor these risks: Less familiar to mainstream end users than OBJ or STL; Not a rich full-scene format; Validate destination compatibility before large-batch conversion.