Introduction

ISO 10303 is an International Standard for the computer-interpretable representation of product information and for the exchange of product data. The objective is to provide a neutral mechanism capable of describing products throughout their life cycle. This mechanism is suitable not only for neutral file exchange, but also as a basis for implementing and sharing product databases, and as a basis for retention and archiving.

Major subdivisions of this document are:

• presentation_organization_schema;
• presentation_definition_schema;
• presentation_appearance_schema;
• presentation_resource_schema.

This part of ISO 10303 specifies the integrated resources for the visualization of displayable properties of products.

The information given in all four schemas of this part of ISO 10303 together is sufficient to describe in detail how product information is visualized by a receiving system. The presentation information contained in this part of ISO 10303 can be used only in conjunction with product information suitable for display. Presentation information as contained in this part of ISO 10303 cannot be displayed by itself without reference to product information.

The presentation organization schema describes the hierarchical and partially recursive structure of the presentation sets, areas and views in which images of the product information are displayed. It also explains how the components of the product information image and its annotation are organized as displayable objects and how these are placed into the context of presentations. This schema also accounts for the definition of the projective process for geometry by means of a camera model and for the specification of lighting and shading models.

The presentation definition schema serves to define how the individual geometric and non-geometric components of the product information are selected, assembled into presentation groups, and associated with presentation styles.

The presentation appearance schema defines the appearance attributes that can be chosen to describe the desired visual appearance of the displayable elements of the product information by enumerating the available graphical presentation styles.

The presentation resource schema provides basic graphical capabilities such as text font definition, symbol definition, and colour definition.

The visual presentation characteristics described in this part of ISO 10303 are often associated with information from other generic resource parts, especially with geometric and topological representations (ISO 10303-42). The Application Protocols determine which resource parts are used together. Applications which make use of the generic resources in this part provide both the product information to be visually presented and the semantic meaning of the presentation. Possible applications include rendered views of product shape, results of scientific visualization, technical drawings, diagrams, charts, and graphics for technical publications.

The integrated resources specified in this part of ISO 10303 support the visual presentation of the properties of products. The generation of visual images using data specified by these integrated resources requires the use of an appropriate display system. This part of ISO 10303 specifies the input data to such systems, together with the necessary structures and constraints that relate presentation data to other aspects of product data.

Many display systems conform to existing ISO standards for computer graphics, such as GKS-3D (ISO 8805 [1]) and PHIGS/PHIGS PLUS (ISO/IEC 9592 [11]). This part of ISO 10303 takes into account the concepts and terminology of these standards. Input data specified by this part of ISO 10303 is therefore intended to be suitable for further processing by displays conforming to graphics standards.

The relationships of the schemas in this document to other schemas that define the integrated resources of ISO 10303 are illustrated in Figure 1 using the EXPRESS-G notation. EXPRESS-G is defined in ISO 10303-11.

The schemas illustrated in Figure 1 are components of the integrated resources.

• Figure 1 — The relationship of the schemas of this part to the ISO 10303 integration architecture (1 of 1)

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