illegal2vrml - Man Page

convert VRML97 files with illegal extensions

Synopsis

illegal2vrml [ -prefix prefix ]   protofile.wrl file.wrl

Description

illegal2vrml convert Virtual Reality Modeling Language (VRML97) files with illegal  extensions to valid VRML97, according to ISO/IEC 14772 Annex F. Annex F decribe, how extensions to the VRML language should be implemented: using a EXTERNPROTO with a "urn" (fake URL) that sign the VRML browser the extension and not to use the following URL.

illegal2vrml read the file protofile.wrl which should contain such EXTERNPROTOs.  The names of the EXTERNPROTOs should start with the same prefix. The prefix is needed to deal with additional illegal field names in valid VRML97 nodes.
In the next step illegal2vrml read the file file.wrl and replace all node names which are identical to the EXTERNPROTOs without the prefix with the names of the EXTERNPROTOs (with the prefix).
In the last step, the result is written to standard output.

Options

-prefix prefix

set the name of the prefix of the EXTERNPROTOs. If this option is not used, the prefix is calculated from the proto names in protofile.wrl

Example

Imagine a VRML97 file with a illegal extension to the WorldInfo node

$ cat $HOME/worldinfo.wrl

#VRML V2.0 utf8

WorldInfo
{
 copyright "(C) illegal extension Inc."
 info      "a existing VRML97 node with a illegal extension"
}

A matching file with a EXTERNPROTO would be
$ cat $HOME/protofile.wrl

#VRML V2.0 utf8

EXTERNPROTO PrefixWorldInfo
[
field SFString copyright
field MFString info
field SFString title
]
["urn:inet:browser.com:library:PrefixWorldInfo" "PrefixWorldInfo.wrl"]

To convert to a valid VRML97 file, use
$ illegal2vrml -prefix Prefix  $HOME/protofile.wrl $HOME/worldinfo.wrl

#VRML V2.0 utf8

EXTERNPROTO PrefixWorldInfo
[
field SFString copyright
field MFString info
field SFString title
]
["urn:inet:browser.com:library:PrefixWorldInfo" "PrefixWorldInfo.wrl"]

PrefixWorldInfo
 {
 copyright "(C) illegal extension Inc."
 info
   [
   "a existing VRML97 node with a illegal extension"
   ]
 }

Bugs

Inside PROTOs, the conversion program do not parse for node names (yet). Therefore only a string based replacement is made inside PROTOs.

Diagnostics

Exit status is 0 for sucessfull operation, 1 if inputfiles can not be sucessfully read or other error

See Also

VRML97 International Standard

http://www.web3d.org/x3d/specifications/vrml/ISO-IEC-14772-IS-VRML97WithAmendment1

VRML97 International Standard Annex F

http://www.web3d.org/x3d/specifications/vrml/ISO-IEC-14772-IS-VRML97WithAmendment1/part1/extensions.html

Referenced By

dune(1).

2017-09-20 white_dune 0.99rc766