[x3d-public] JSON encoding for SFNode: no [array brackets]
Don Brutzman
brutzman at nps.edu
Fri Feb 19 07:21:37 PST 2016
Thanks for the catch. Correction checked in, updated test result attached. Examples should be again updated in time for our weekly JSON teleconference.
Another clarification: I got the types from X3DObjectModel-3.3.xml
http://www.web3d.org/x3d/stylesheets/X3DObjectModel-3.3.xml
Roy, this is pretty mature, can we also check it into subversion? The object-model document changes over time may be interesting.
On 2/19/2016 5:51 AM, Roy Walmsley wrote:
> Hi Don,
>
> Sorry to say you missed "material". I've changed my Schema, and using your new stylesheet I am regenerating the Basic archive JSON examples. I've started testing and noted that "material" fails. The 'Hello World" example can also be seen to still have the array.
>
> I'll modify the stylesheet, and rerun the example generation, and do some more testing. Obviously, not going to be ready for full test runs later!
>
> Roy
>
> -----Original Message-----
> From: Don Brutzman [mailto:brutzman at nps.edu]
> Sent: 19 February 2016 08:17
> To: John Carlson; Roy Walmsley; X3D Graphics public mailing list
> Subject: JSON encoding for SFNode: no [array brackets]
>
> John, during today's X3D Schema/DTD teleconference Roy observed that our SFNode child nodes were always wrapped in [array brackets] even though there is not an array there.
>
> This is contrary to our declared design principle that SFNode is always a JSON object.
>
> http://www.web3d.org/x3d/stylesheets/X3dToJson.html#values
>
> That definitely appears to be what we want. No desire to mislead JSON authors into thinking that another node might appear.
>
> Fortunately this implementation wasn't too difficult. Here is the list of SFNode types that I constructed from AllX3dElementsAttributes.3.3.xml
>
> <xsl:variable name="SFNodeType" select="
> ($fieldName = 'back') or ($fieldName = 'bottom') or ($fieldName = 'front') or
> ($fieldName = 'left') or ($fieldName = 'right') or ($fieldName = 'top') or
> ($fieldName = 'backTexture') or ($fieldName = 'bottomTexture') or ($fieldName = 'frontTexture') or
> ($fieldName = 'leftTexture') or ($fieldName = 'rightTexture') or ($fieldName = 'topTexture') or
> ($fieldName = 'appearance') or ($fieldName = 'body1') or ($fieldName = 'body2') or
> ($fieldName = 'collidable') or ($fieldName = 'collider') or
> ($fieldName = 'color') or ($fieldName = 'colorRamp') or ($fieldName = 'coord') or
> ($fieldName = 'controlPoint') or ($fieldName = 'controlPoints') or ($fieldName = 'crossSectionCurve') or
> ($fieldName = 'emitter') or ($fieldName = 'fillProperties') or
> ($fieldName = 'fogCoord') or ($fieldName = 'fontStyle') or ($fieldName = 'geoOrigin') or
> ($fieldName = 'geometry') or ($fieldName = 'geometry1') or ($fieldName = 'geometry2') or
> ($fieldName = 'gradients') or ($fieldName = 'layout') or ($fieldName = 'lineProperties') or
> ($fieldName = 'massDensityModel') or
($fieldName = 'material') or
> ($fieldName = 'metadata') or ($fieldName = 'normal') or ($fieldName = 'pickingGeometry') or
> ($fieldName = 'profileCurve') or ($fieldName = 'proxy') or
> ($fieldName = 'renderStyle') or ($fieldName = 'source') or
> ($fieldName = 'segmentIdentifiers') or ($fieldName = 'surface') or ($fieldName = 'surfaceNormals') or
> ($fieldName = 'targetObject') or ($fieldName = 'texCoord') or ($fieldName = 'texCoordRamp') or
> ($fieldName = 'texture') or ($fieldName = 'textureProperties') or ($fieldName = 'textureTransform') or
> ($fieldName = 'trajectoryCurve') or ($fieldName = 'transferFunction') or
> ($fieldName = 'viewpoint') or ($fieldName = 'voxels') or
> ($fieldName = 'weightTransferFunction1') or ($fieldName = 'weightTransferFunction2') or
> ($parentName='CADFace' and $fieldName = 'shape') or
> ($parentName='CollidableShape' and $fieldName = 'shape')" />
>
> So anyway it appears to be working on the first handful of test examples used during development.
>
> HelloWorld.json example attached, check out SFNode fields -appearance -geometry -material etc. Output is slightly terser as well.
>
> No doubt this affects your implementation to but it appears to be an important change.
>
> Hope this sounds good to you too. Chalk another win up for Roy's JSON schema!
>
> Stylesheet modifications checked in. I'm running the JSON Examples build overnight, should be ready for you and Roy in the morning.
>
> http://www.web3d.org/x3d/content/examples/X3dResources.html#Examples
> "Special testing distribution. A comprehensive collection of all JSON example scenes is available at X3dExampleArchivesJsonScenes.zip (MD5 checksum) plus current output from the X3D JSON build process at build.json.out."
all the best, Don
--
Don Brutzman Naval Postgraduate School, Code USW/Br brutzman at nps.edu
Watkins 270, MOVES Institute, Monterey CA 93943-5000 USA +1.831.656.2149
X3D graphics, virtual worlds, navy robotics http://faculty.nps.edu/brutzman
-------------- next part --------------
{ "X3D": {
"@profile":"Immersive",
"@version":"3.3",
"@xsd:noNamespaceSchemaLocation":"http://www.web3d.org/specifications/x3d-3.3.xsd",
"head": {
"meta": [
{
"@name":"title",
"@content":"HelloWorld.x3d"
},
{
"@name":"description",
"@content":"Simple X3D scene example: Hello World!"
},
{
"@name":"created",
"@content":"30 October 2000"
},
{
"@name":"modified",
"@content":"23 November 2014"
},
{
"@name":"creator",
"@content":"Don Brutzman"
},
{
"@name":"Image",
"@content":"HelloWorld.tall.png"
},
{
"@name":"reference",
"@content":"http://en.wikipedia.org/wiki/Hello_world"
},
{
"@name":"reference",
"@content":"en.wikipedia.org/wiki/Hello#\"Hello,_World\"_computer_program"
},
{
"@name":"reference",
"@content":"http://en.wikibooks.org/w/index.php?title=Computer_Programming/Hello_world"
},
{
"@name":"reference",
"@content":"http://www.HelloWorldExample.net"
},
{
"@name":"reference",
"@content":"http://www.web3D.org"
},
{
"@name":"reference",
"@content":"http://www.web3d.org/realtime-3d/news/internationalization-x3d"
},
{
"@name":"reference",
"@content":"http://www.web3d.org/x3d/content/examples/HelloWorld.x3d"
},
{
"@name":"reference",
"@content":"http://X3dGraphics.com/examples/X3dForAdvancedModeling/HelloWorldScenes"
},
{
"@name":"identifier",
"@content":"http://X3dGraphics.com/examples/X3dForWebAuthors/Chapter01-TechnicalOverview/HelloWorld.x3d"
},
{
"@name":"license",
"@content":"http://www.web3d.org/x3d/content/examples/license.html"
},
{
"@name":"generator",
"@content":"X3D-Edit 3.3, https://savage.nps.edu/X3D-Edit"
},
{
"@name":"reference",
"@content":"HelloWorld.wrl"
},
{
"@name":"reference",
"@content":"HelloWorld.x3dv"
},
{
"@name":"reference",
"@content":"HelloWorld.x3db"
},
{
"@name":"reference",
"@content":"HelloWorld.xhtml"
},
{
"@name":"reference",
"@content":"HelloWorld.json"
}
],
"-children":[
{ "#comment":"Alternate encodings: VRML97, X3D ClassicVRML Encoding, X3D Compressed Binary Encoding (CBE), X3DOM, JSON"
}
]
},
"Scene": {
"-children":[
{ "#comment":"Example scene to illustrate X3D nodes and fields (XML elements and attributes)"
},
{ "Group":
{
"-children":[
{ "Viewpoint":
{
"@DEF":"ViewUpClose",
"@centerOfRotation":[0,-1,0],
"@description":"Hello world!",
"@position":[0,-1,7]
}
},
{ "Transform":
{
"@rotation":[0,1,0,3],
"-children":[
{ "Shape":
{
"-geometry":
{ "Sphere":
{
}
},
"-appearance":
{ "Appearance":
{
"-material":
{ "Material":
{
"@DEF":"MaterialLightBlue",
"@diffuseColor":[0.1,0.5,1]
}
},
"-texture":
{ "ImageTexture":
{
"@DEF":"ImageCloudlessEarth",
"@url":["earth-topo.png","earth-topo.jpg","earth-topo-small.gif","http://www.web3d.org/x3d/content/examples/Basic/earth-topo.png","http://www.web3d.org/x3d/content/examples/Basic/earth-topo.jpg","http://www.web3d.org/x3d/content/examples/Basic/earth-topo-small.gif"]
}
}
}
}
}
}
]
}
},
{ "Transform":
{
"@translation":[0,-2,0],
"-children":[
{ "Shape":
{
"-geometry":
{ "Text":
{
"@DEF":"TextMessage",
"@string":["Hello","world!"],
"-fontStyle":
{ "FontStyle":
{
"@justify":["MIDDLE","MIDDLE"]
}
}
}
},
"-appearance":
{ "Appearance":
{
"-material":
{ "Material":
{
"@USE":"MaterialLightBlue"
}
}
}
}
}
}
]
}
}
]
}
}
]
}
}
}
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