User`s guide

5 Build Virtual Reality Worlds
5-32
have VRML export filters, but there are conversion utilities available from third parties
if the export filter is not directly available in the CAD tool.
When exporting CAD models into the VRML format, several options can be set to
customize the output. These include options specific to the export filters or are general
CAD file properties (consult your CAD system documentation for specific details on how
to set these properties). The most typical and useful properties are the following:
• “VRML Format Type” on page 5-32
• “Level of Detail Considerations” on page 5-33
• “Units Used in Exported Files” on page 5-33
• “Coordinate System Used” on page 5-34
• “Assembly Hierarchy” on page 5-34
VRML Format Type
There are two major versions of the VRML format used by graphic tools: the older
format, called VRML1, and the newer format, called VRML2 (or more often VRML97,
according to the adoption year of the ISO
®
standard). The Simulink 3D Animation
software uses VRML97, so select VRML97 as the export format.
If your CAD tool allows only VRML1 export, you can use the Ligos V-Realm Builder
application, a native VRML scene editor supplied with the Simulink 3D Animation
software, to convert models from VRML1 to VRML97. Simply open a VRML1 file and
resave it in V-Realm so that the file is automatically saved in the VRML97 format.
Note: All references to the general abbreviation, VRML, refer to the VRML97 standard.