To use these tutorial notes you will need an HTML Web browser with
support for viewing VRML worlds. An up to date list of available
VRML browsing and authoring software is available at:
These tutorial notes primarily contain two types of information:
The tutorial slides are arranged as a sequence of 500+ hyper-linked
pages containing VRML syntax notes, VRML usage comments, or images of
sample VRML worlds. Clicking on a sample world's
image, or the file name underneath it, loads the VRML world into your
browser for you to examine yourself.
You can view the text for any of the VRML
worlds using a text editor and see how I created a particular effect.
In most cases, the VRML files contain extensive comments providing
information about the techniques the file illustrates.
The tutorial notes provide a necessarily terse overview of VRML.
I recommend that you
invest in one of the VRML books on the market to get thorough
coverage of the language. I am a co-author
of one such VRML book, The VRML 2.0 Sourcebook.
Several other good VRML books are on the market as well.
VRML has evolved through several versions of the language, starting
way back in late 1994.
These tutorial notes cover VRML 97, the latest version of the language.
To provide context, the following table provides a quick
overview of these VRML versions and the names they have become known by.
VRML 1.0 browser plug-ins became widely available
by late 1995, though few ever supported the full
range of features defined by the VRML 1.0 specification.
No VRML 1.1 browsers exist.
While multiple VRML 2.0 browsers exist today,
as of this writing, none are complete. All
of the browsers are missing a few features. Fortunately,
most of the missing features are obscure aspects of VRML.
Most major VRML 2.0 browsers are now VRML 97 browsers.
VRML 1.0 and VRML 2.0 differ radically in syntax
and features. A VRML 1.0 browser cannot display VRML 2.0 worlds.
Most VRML 2.0 browsers, however, can display VRML 1.0 worlds.
VRML 97 differs in a few minor ways from VRML 2.0. In most cases,
a VRML 2.0 browser will be able to correctly display VRML 97 files.
However, for 100% accuracy, you should have a VRML 97 compliant
browser for viewing the VRML files contained within these tutorial notes.
These tutorial notes were developed primarily on Silicon Graphics High Impact
UNIX workstations. HTML and VRML text was hand-authored using a text
editor. A Perl program script was used to process raw tutorial notes text to
produce the 500+ individual
HTML files, one per tutorial slide.
HTML text was displayed using Netscape Navigator 3.01 on Silicon Graphics
and PC systems. Colors were checked for viewability in 24-bit, 16-bit, and
8-bit display modes on a PC. Text sizes were chosen for viewability
at a normal 12 point font on-screen, and at an 18 point font for presentation
during the tutorial. The large text, white-on-black colors,
and terse language are used to insure that slides are readable when
displayed for the tutorial audience at the conference.
VRML worlds were displayed on Silicon Graphics systems using the
Silicon Graphics Cosmo Player 1.02 VRML 97 compliant browser
for Netscape Navigator.
The same worlds were displayed on PC systems using three different VRML
2.0 compliant browsers for Netscape Navigator:
Silicon Graphics Cosmo Player 2.0 beta 1,
Intervista WorldView 2.0, and Newfire Torch beta.
Texture images were created using Adobe PhotoShop 4.0 on a PC with
help from KAI's PowerTools 3.0 from MetaTools.
Image processing was also performed using the Image Tools suite
of applications for UNIX workstations from the San Diego Supercomputer Center.
PDF tutorial notes for printing were created by dumping
individual tutorial slides to PostScript on a Silicon Graphics workstation.
The PostScript was transferred to a PC where it was converted to PDF
and assembled into a single PDF file using Adobe's Distiller and Exchange.
I am often asked if there are any restrictions on use of these
tutorial notes. The answer is:
You are free to use these tutorial notes in whole or in part to
help you teach your own VRML tutorial. You may translate these notes
into other languages and you may post copies of these notes on your
own Web site, as long as the above copyright notice is included as well.
You may not, however, sell these tutorial notes for profit or include
them on a CD-ROM or other media product without written permission.
If you use these tutorial notes, I ask that you:
If you find bugs in the notes, please tell me. I have worked hard to
try and make the notes bug-free, but if something slipped by, I'd
like to fix it before others are confused by my mistake.
UPS, Fed Ex: 10100 Hopkins Dr.
(619) 534-5062
The VRML Repository
(http://vrml.sdsc.edu)
Version
Released
Comments
VRML 1.0
May 1995
Begun in late 1994, the first version of VRML was
largely based upon
the Open Inventor file format developed by
Silicon Graphics Inc. The VRML 1.0 specification
was completed in May 1995 and included support for
shape building, lighting, and texturing.
VRML 1.0c
January 1996
As vendors began producing VRML 1.0 browsers, a number
of ambiguities in the VRML 1.0 specification surfaced.
These problems were corrected in a new VRML 1.0c (clarified)
specification released in January 1996. No new features
were added to the language in VRML 1.0c.
VRML 1.1
canceled
In late 1995, discussion began on extensions to the VRML 1.0
specification. These extensions were intended to address
language features that made browser implementation difficult
or inefficient. The extended language was tentatively
dubbed VRML 1.1. These enhancements were later dropped
in favor of forging ahead on VRML 2.0 instead.
Moving Worlds
January 1996
VRML 1.0 included features for building static, unchanging
worlds suitable for architectural walk-throughs and some
scientific visualization applications. To extend the
language to support animation and interaction, the VRML
architecture group made a call for proposals for a language
redesign.
Silicon Graphics, Netscape, and others worked together to
create the Moving Worlds proposal, submitted
in January 1996.
That proposal was later accepted and became the starting
point for developing VRML 2.0. The final VRML 2.0
language specification is still sometimes referred to as
the Moving Worlds specification, though it differs
significantly
from the original Moving Worlds proposal.
VRML 2.0
August 1996
After seven months of intense effort by the VRML
community, the Moving Worlds proposal evolved to
become the final VRML 2.0 specification, released
in August 1996. The new specification redesigned
the VRML syntax and added an extensive set of new
features for shape building, animation, interaction,
sound, fog, backgrounds, and language extensions.
VRML 97
September 1997
In early 1997, efforts got under way to present
the VRML 2.0 specification to the International
Standards Organization (ISO) which oversees most of
the major language specifications in use in the
computing community. The ISO version of VRML 2.0
was reviewed and the specification significantly
rewritten to clarify issues. A few minor changes
to the language were also made. The final ISO VRML
was dubbed VRML 97. The VRML 97 specification
features finalized in March 1997, while the specification's
text finalized in September 1997.
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