The namespace contains the STP model classes.

### Classes
| Class | Description |
| :- | :- |
| [`ColorDataUnit`](/cad/python-net/aspose.cad.fileformats.stp.stplibrary.core.models/colordataunit) | Customize the color of the surface. |
| [`NormalDataUnit`](/cad/python-net/aspose.cad.fileformats.stp.stplibrary.core.models/normaldataunit) | Normal to the surface. |
| [`TriangularFacet`](/cad/python-net/aspose.cad.fileformats.stp.stplibrary.core.models/triangularfacet) | Triangular facet of the surface. |
| [`VertexDataUnit`](/cad/python-net/aspose.cad.fileformats.stp.stplibrary.core.models/vertexdataunit) | The coordinates of the vertices triangle facets. |