STEP-NC WebGL Demo

• STEPTools Inc (Troy, NY)
• STEPTools WebGL demonstration
• boxy.xml Warning 39 MB XML file.
• STEP-NC file This is a Zip archive of a STEP Part 28 (XML encoding) file.
• shell55130_tri.x3d Workpiece rendered through IndexedTriangleSet node , with per-triangle normals provided
• shell55130_tri_nonormal.x3d Workpiece rendered through IndexedTriangleSet node, without per-triangle normals included.
• shell55130_nurbs_transpose.x3d Workpiece rendered through NurbsTrimmedSurface, with parameters transposed for rendering on InstantReality X3d browser.

An XSLT script can generate an X3D file from the triangle data in WebGL data. The script used takes two parameters. Using the xsltproc XSLT command line tool, the invocation looks like:

xsltproc  -param "shape" "//shell[@id='id55130']" -param "include-normal" "false()"   convert_to_x3d.xsl boxy.xml > boxy_shell.x3d

<?xml version="1.0" encoding="utf-8"?>


<!-- 
XSL transformation to generate an X3D file from the xml data used for 
the STEPTools WebGL demo (http://www.steptools.com/demos)

This transformation takes two parameters
shape : an XPath expression identifying the nodes in the source XML file which contains
geometry to be converted to X3D

include-normal : enter as true() or false()  whether normal geometry data taken from
source file should be included in X3D geometry
-->



 
<xsl:stylesheet version="1.0" 
                xmlns:xsl="http://www.w3.org/1999/XSL/Transform" 
                xmlns:str="http://exslt.org/strings"
                extension-element-prefixes="str">

<xsl:output method="xml" encoding="utf-8"/>


<xsl:param name="shape"/>
<xsl:param name="include-normal" select="0"/>

<xsl:template match="/">
<X3D xmlns:xsd="http://www.w3.org/2001/XMLSchema-instance" 
    xsd:noNamespaceSchemaLocation="http://www.web3d.org/specifications/x3d-3.2.xsd" 
    version="3.2" 
    profile="Interchange">
  <head/>
  <Scene>
    <Background skyColor="0.2 0.5 0.2"/>
    <Shape>
    <xsl:apply-templates select="$shape"/>
    <Appearance>
        <Material containerField="material" diffuseColor="1.000000 1.000000 1.000000"/>
    </Appearance>
    </Shape>
</Scene>
</X3D>
</xsl:template>

<xsl:template match="shell">
<IndexedTriangleSet containerField="geometry" solid="FALSE">
    <xsl:attribute name="index">
    <xsl:for-each select="facets/f/@v">
        <xsl:for-each select="str:split(normalize-space(.))">
            <xsl:value-of select="number(./text())+0"/><xsl:text> </xsl:text>
        </xsl:for-each>
    </xsl:for-each>
    </xsl:attribute>
    <Coordinate containerField="coord">
    <xsl:attribute name="point">
    <xsl:for-each select="./verts/v/@p">
        <xsl:for-each select="str:split(normalize-space(.))">
            <xsl:value-of select="format-number(number(./text()),'###.####')"/><xsl:text> </xsl:text>
        </xsl:for-each>

        <xsl:if test="position() < last()">
            <xsl:text>, </xsl:text>
        </xsl:if>
    </xsl:for-each>
    </xsl:attribute>
    </Coordinate>
    
    <xsl:if test="$include-normal"> 
        <Normal containerField="normal">
        <xsl:attribute name="vector">
        <xsl:for-each select="facets/f/@fn">
            <xsl:for-each select="str:split(normalize-space(.))">
                <xsl:value-of select="format-number(number(./text()),'###.####')"/><xsl:text> </xsl:text>
            </xsl:for-each>
    
            <xsl:if test="position() < last()">
                <xsl:text>, </xsl:text>
            </xsl:if>
        </xsl:for-each>
        </xsl:attribute>
        </Normal>
    </xsl:if>
    
</IndexedTriangleSet>
</xsl:template>

</xsl:stylesheet>