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Chapter 20. WHY X3D? > Conformance Concerns

Conformance Concerns

In 1997 the VRML Consortium asked Mary Brady of the National Institute of Standards and Technology (NIST) to develop a series of conformance tests for VRML browsers. You can see them at http://www.itl.nist. gov/div897/ctg/vrml/vrml.htm. In addition, because our goal was to make VRML worlds look the same everywhere, Eric Haines developed a Java applet called Pellucid (http://www.acm. org/tog/resources/applets/vrml/pellucid.html) which was a "perfect" implementation of the VRML color and lighting model. Browser makers can compare their renderings with Pellucid's to see how well their color and lighting matches the standard.

Unfortunately, no one ever put a process in place that would issue a certification for conformance to the VRML97 specification, so testing was strictly voluntary. While a number of people in the major browser companies used Mary's and Eric's tests, browser makers who claimed conformance often did so based on less-than-perfect performance on the tests.


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