Boundary Representation - Standardization

Standardization

In the world of data-exchange, STEP, the Standard for the Exchange of Product Model data also defines some data models for boundary representations. The common generic topological and geometric models are defined in ISO 10303-42 Geometric and topological representation. The following Application Integrated Resources (AICs) define boundary models that are constraints of the generic geometric and topological capabilities:

• ISO 10303-511 Topologically bounded surface, definition of an advanced face, that is a bounded surface where the surface is of type elementary (plane, cylindrical, conical, spherical or toroidal), or a swept surface, or b spline surface. The boundaries are defined by lines, conics, polylines, surface curves, or b spline curves
• ISO 10303-514 Advanced boundary representation, a solid defining a volume with possible voids that is composed by advanced faces
• ISO 10303-509 Manifold surface, a non intersecting area in 3D that is composed by advanced faces
• ISO 10303-521 Manifold subsurface, a sub-area out of a manifold surface
• ISO 10303-508 Non-manifold surface, any kind of advanced face arrangement
• ISO 10303-513 Elementary boundary representation similar to ISO 10303-514, but restricted to the elementary surfaces only
• ISO 10303-512 Faceted boundary representation a simplified surface model constructed by planar surfaces only