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VRML Syntax and Grammar

VRML Syntax and Grammar. Learning Objectives. Understand the formal grammar definition for VRML found here: http://www.vrml.org/technicalinfo/specifications/vrml97/part1/grammar.html Understand how grammar rules work Understand how a VRML file is parsed and understood by a software program.

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VRML Syntax and Grammar

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  1. VRML Syntax and Grammar

  2. Learning Objectives • Understand the formal grammar definition for VRML found here: http://www.vrml.org/technicalinfo/specifications/vrml97/part1/grammar.html • Understand how grammar rules work • Understand how a VRML file is parsed and understood by a software program.

  3. Structure of a VRML File • Header • Scene graph • Prototypes • Event routing

  4. VRML Header • #VRML V2.0 <encoding type>[optional comment]<line terminator> • Encoding type is usually “utf8”, but other encoding schemes are possible.

  5. VRML Scene Graph • Describes the scene graphs • Defines the connections among events • Identifies positions in the scene graph for reference by events

  6. Prototypes • PROTO Cube [ ] { Box { } } • Declares a new type, Cube, that has one shape node inside, Box. • You can also declare user-defined variables within the prototype.

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