ISO 16757-2:2016
Data structures for electronic product catalogues for building services — Part 2: Geometry
Data structures for electronic product catalogues for building services — Part 2: Geometry
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 82
- Дата публикации:
- 14 ноября 2016 г.
- Издание:
- ISO IS 16757 edition 1 version 1
- ICS:
- 91.010.01
ISO 16757-2:2016 describes the modelling of building services product geometry. The description is optimized for the interchange of product catalogue data and includes - shapes for representing the product itself, - symbolic shapes for the visualization of the product's function in schematic diagrams, - spaces for functional requirements, - surfaces for visualization, and - ports to represent connectivity between different objects. The shape and space geometry is expressed as Constructive Solid Geometry (CSG) based on geometric primitives concatenated to boundary representations by Boolean operations. ISO 16757-2:2016 uses the applicable primitives from ISO 10303‑42 and from ISO 16739 and adds primitives which are required for the special geometry of building services products. For symbolic shapes, line elements are also used. ISO 16757-2:2016 neither describes the inner structure and internal functionality of the product nor the manufacturing information because this is typically not published within a product catalogue. Building services products can have millions of variant dimensions. To avoid the exchange of millions of geometries, a parametric model is introduced which allows the derivation of variant-specific geometries from the generic model. This is necessary to reduce the data to be exchanged in a catalogue to a manageable size. The parametric model will result in smaller data files, which can be easier transmitted during data exchanges. The geometry model used does not contain any drawing information such as views, line styles or hatching.
Abstract
Overview
ISO 16757-2:2016 defines the geometry model for electronic product catalogues for building services. It standardizes how product shapes, symbolic shapes, spaces, surfaces and ports are represented to enable reliable interchange of catalogue geometry for HVAC, plumbing, electrical and other building services components. Geometry is expressed using Constructive Solid Geometry (CSG) with geometric primitives and Boolean operations, and a parametric model is used to derive variant-specific geometries from generic models to avoid exchanging millions of files.
Key topics and technical requirements
- Geometry representation: Product shape, product surface, symbolic shape (lines allowed), functional spaces (operation, access, installation, placement, transportation) and ports for connectivity.
- CSG-based modelling: Shapes and spaces are constructed as CSG trees whose leaves are geometric primitives and inner nodes are Boolean/CSG operators.
- Primitives and mapping: Uses applicable primitives from ISO 10303‑42 and ISO 16739 and extends them with building‑services-specific primitives.
- Parametric modelling: Attribute values in CSG trees are described by formulas referencing manufacturer-defined geometric properties so variant geometries can be derived, reducing catalogue data size.
- Ports and connectivity: Ports are located, oriented and directed features to represent connections for media transfer, fastening or control.
- Level of detail and clipping: The standard specifies methodology for representing geometry at suitable detail for catalogue exchange (it does not include drawing elements such as views, line styles or hatching).
- Exclusions: ISO 16757-2 does not describe internal product structure, manufacturing information, or detailed engineering behavior - catalogue-focused geometry only.
- Interoperability considerations: Descriptions support mapping to parametrizable STEP and IFC geometry for BIM workflows.
Applications and who uses it
ISO 16757-2 is intended for:
- Manufacturers producing electronic product catalogues (reduce data size and publish parametric models).
- BIM/CAD/CAE software vendors implementing geometry import/export for building services components.
- MEP engineers and designers who need accurate catalogue geometry for clash detection, simulations and system modelling.
- Facility managers and life‑cycle solution providers integrating component geometry into asset management and maintenance tools.
Practical benefits include streamlined product selection across manufacturers, smaller transferable files through parametrization, improved BIM integration, and easier re-simulation and lifecycle data exchange.
Related standards
- ISO 16757-1 (concepts, architecture and model)
- ISO 16757-3 / -4 / -5 (scripting, IDM/IFC mapping, XML exchange format)
- ISO 10303‑42 and ISO 16739 (geometry primitives / IFC foundations)
Keywords: ISO 16757-2, product catalogue geometry, CSG, parametric model, BIM, building services, ports, geometry primitives, IFC, STEP.
Технические детали
- Технический комитет
- ISO/TC 59/SC 13 - Organization and digitization of information about buildings and civil engineering works, including building information modelling (BIM)
- SKU
- ISO 16757-2:2016
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