CAD Exchanger SDK
Para_Reader can read files compliant with the Parasolid file format (schema) from v0.15 and above (the latest tested version is Parasolid v34.1). Para_Writer can write files compliant with the Parasolid file format from v12 to v34.1.
Both text and binary files are supported.
| Import | Export |
|---|---|
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Below tables shows how Parasolid entities are mapped into CAD Exchanger entities after import.
| Parasolid Entity | CAD Exchanger Entity |
|---|---|
| ASSEMBLY | ModelData_Assembly |
| INSTANCE | ModelData_Instance |
| BODY | ModelData_Part |
| TRANSFORM | ModelData_Transformation |
| Parasolid Entity | CAD Exchanger Entity |
|---|---|
| BODY | One of: |
| SHELL | ModelData_Shell |
| FACE | ModelData_Face |
| LOOP | ModelData_Wire |
| HALFEDGE | ModelData_Edge |
| EDGE | |
| VERTEX | ModelData_Vertex |
| Parasolid Entity | CAD Exchanger Entity |
|---|---|
| Surfaces | |
| B_SURFACE | ModelData_BSplineSurface |
| CONE | ModelData_ConicalSurface |
| CYLINDER | ModelData_CylindricalSurface |
| OFFSET_SURF | ModelData_OffsetSurface |
| PLANE | ModelData_Plane |
| SPHERE | ModelData_SphericalSurface |
| SPUN_SURF | ModelData_SurfaceOfRevolution |
| SWEPT_SURF | ModelData_SurfaceOfLinearExtrusion |
| TORUS | One of:
|
| Curves | |
| B_CURVE | ModelData_BSplineCurve ModelData_BSplineCurve2d |
| BLENDED_EDGE | ModelData_BSplineCurve |
| INTERSECTION | |
| CIRCLE | ModelData_Circle |
| ELLIPSE | ModelData_Ellipse |
| LINE | ModelData_Line |
| TRIMMED_CURVE | ModelData_TrimmedCurve ModelData_TrimmedCurve2d |
The Parasolid export parameters are controlled by Para_WriterParameters. The following table contains a list of parameters for Parasolid export:
| Parameter | Default value | Description |
|---|---|---|
| TargetParasolidVersion() | 12 | Specifies a target Parasolid kernel version version. Must be in the range [12, 34.1]. The parameter defines the actual schema to be used when writing a file. Note that several target versions can result in selecting the same schema, e.g. if TargetParasolidVersion() is 20 to 24 then the schema 20000 will be chosen. By default writes a file using the schema with id 12103. This schema inherits version 12006, which is recommended by the Parasolid-XT format specification and extends it with the UNICODE_VALUES attribute. This ensures reading by most applications and allows to save Unicode strings. |
| OriginatingSystem() | "unknown" | See Base_WriterParameters::OriginatingSystem(). |
Although the Parasolid spec is not explicit about how Unicode strings should be written (in particular, if a Parasolid file can contain UTF-8 strings), analysis has been conducted on how Parasolid-based CAD systems handle such strings. As of version 3.9.1 CAD Exchanger significantly changed its behavior with respect to handling Unicode strings.
When importing files containing name attributes written both in Unicode and Ascii versions (using UNICODE_VALUES and CHAR_VALUES respectively), the importer favors the former one.
When exporting a name string only containing characters inside the [0x00, 0x7F] range (i.e. which correspond to both Ascii table and single byte in UTF-8 encoding) such a string will be saved in the CHAR_VALUES entity. Otherwise, the UNICODE_VALUES entity will be created to hold an original string. Characters outside the above range will be replaced with the question mark (?) in the CHAR_VALUES entity.