Summary

###########################################################################

	File:     vrml.icn

	Subject:  Procedures to support creation of VRML files

	Author:   Ralph E. Griswold

	Date:     May 2, 2001

###########################################################################

  This file is in the public domain.

###########################################################################

  This file contains procedures for producing VRML files.

	point_field(L)	create VRML point field from point list L

	u_crd_idx(i)	create VRML coordinate index for 0 through i - 1

	render(x)	render node x

	vrml1(x)	produces VRML 1.0 file for node x

	vrml2(x)	produces VRML 2.0 file for node x

	vrml_color(s)	convert Icon color specification to vrml form

  Notes:

    Not all node types have been tested.

    Where field values are complex, as in vectors, these must be built
    separately as strings to go in the appropriate fields.

    There is no error checking.  Fields must be given in the
    order they appear in the node record declarations and field values
    must be of the correct type and form.

  The introduction of record types other than for nodes will cause
  bogus output.  A structural loop will produce output until the
  evaluation stack overflows.

###########################################################################

  Links:  ptutils, records

###########################################################################

  Requires:  Version 9 graphics for color conversion

###########################################################################

  See also:  vrml1lib.icn and vrml2.icn

###########################################################################

This file is part of the (main) package.

point_field(pts)

: create VRML point field

render(x, f)

 render VRML object

u_crd_idx(i)

: create VRML coordinate index

vrml1(x, f)

: write VRML 1.0 file

vrml2(x, f)

: produce VRML 2.0 file

vrml_color(s)