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Home Glossary Xmt_txt file

XMT_TXT File Format

The XMT_TXT file format is a Parasolid-based file format used to exchange both precise 3D geometry and assembly structure between CAD systems.

Unlike X_T or X_B, which focus primarily on individual parts or geometry transfer, XMT_TXT is designed to represent complete product structures, making it well suited for multi-part and assembly-level data exchange.


Want to learn about other file formats ? 

Parasolid X_T X_B
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Technical Explanation

XMT_TXT is a text-based Parasolid transmit format that extends standard Parasolid geometry exchange by including assembly hierarchy and relationships.

It is commonly used when transferring complex products composed of multiple parts rather than isolated solid models.

An XMT_TXT file typically contains:

  • Exact Parasolid B-Rep geometry for solids and surfaces
  • Assembly structure, including part relationships and hierarchy
  • Transformation and positioning data for components within an assembly
  • Basic attributes and metadata required to reconstruct the product structure

Because it is text-based, XMT_TXT files are readable at a structural level, similar to X_T. However, they are primarily intended to be processed by Parasolid-enabled CAD systems or interoperability SDKs rather than manually edited.

Applications and Industry Use Cases

XMT_TXT files are commonly used in workflows that require accurate assembly-level data exchange:

  • Multi-CAD collaboration involving full product structures
  • PLM and enterprise systems exchanging assemblies across platforms
  • Manufacturing and CAM workflows that require exact part positioning
  • CAE and digital mockup applications working with full assemblies

Compared to single-part exchange formats, XMT_TXT enables a more complete and context-aware transfer of design data.

Challenges or Common Pitfalls

Working with XMT_TXT files introduces additional complexity compared to part-level formats:

  • Larger file sizes due to text-based storage and assembly content
  • No preservation of parametric feature history or design intent
  • Compatibility depends on the Parasolid version and assembly interpretation of the target system
  • Limited support in lightweight viewers compared to X_T or X_B
  • Reliable parsing and validation are required to correctly reconstruct both geometry and assembly structure

How Spatial Helps

Spatial’s 3D InterOp SDK provides full support for XMT_TXT import and export, enabling developers to read and translate Parasolid assemblies reliably.

3D InterOp preserves exact geometry, assembly hierarchy, positioning, and metadata, while applying advanced validation and healing to ensure clean, consistent results.

Whether integrating XMT_TXT data into Parasolid-based applications or translating it into other CAD kernels such as ACIS or CGM, Spatial enables seamless assembly-level interoperability across complex multi-CAD environments.

Discover how Spatial handles XMT_TXT files efficiently

Explore 3D InterOp

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