[x3d-public] announce: updated encoding, X3D to JSON Stylesheet Converter: string arrays, whitespace, UTF-8, Script #source

[John Carlson]

Another option is an array of strings.

John

> On Nov 16, 2015, at 1:11 AM, John Carlson <yottzumm at gmail.com> wrote:
> 
> It’s likely that you have to convert end-of-line to “\n”  see JSON spec.
> 
> John
> 
>> 
>> The result below looks good to me, according to the JSON specification.  However jslint balks... is it really an error, perhaps an overzealous jslint configuration setting controls this?
>> 
>> Console:
>>> C:\x3d-code\www.web3d.org\x3d\content\examples\X3dForAdvancedModeling/GeometricShapes//ParallelepipedPrototype.x3d processing with X3dToJson stylesheet
>>> Script ParallelepipedScript contains CDATA source-code text, copied as "#source"
>>> C:\x3d-code\www.web3d.org\x3d\content\examples\X3dForAdvancedModeling/GeometricShapes//ParallelepipedPrototype.json processing with jslint
>>> jslint:C:\x3d-code\www.web3d.org\x3d\content\examples\X3dForAdvancedModeling/GeometricShapes//ParallelepipedPrototype.json:279:29:JavaScript URL.
>>> jslint:C:\x3d-code\www.web3d.org\x3d\content\examples\X3dForAdvancedModeling/GeometricShapes//ParallelepipedPrototype.json:284:10:Unexpected character '(space)'.
>> 
>> Excerpt:
>> http://X3dGraphics.com/examples/X3dForAdvancedModeling/GeometricShapes/ParallelepipedPrototype.x3d
>> http://X3dGraphics.com/examples/X3dForAdvancedModeling/GeometricShapes/ParallelepipedPrototype.json
>> 
>>           "-children":[
>>             { "Script":
>>               {
>>                 "@DEF":"ParallelepipedScript",
>>                 "field": [
>>                   {
>>                     "@name":"point",
>>                     "@accessType":"inputOutput",
>>                     "@type":"MFVec3f"
>>                   }
>>                 ],
>>                 "IS": {
>>                   "connect": [
>>                     {
>>                       "@nodeField":"point",
>>                       "@protoField":"point"
>>                     }
>>                   ]
>>                 },
>>                 "#source":"
>> ecmascript:
>> function initialize ()
>> {
>>   checkCoordinatePoints ();
>> }
>> function checkCoordinatePoints ()
>> {
>>   // A parallelepiped has three sets of four parallel edges; the edges within each set are of equal length.
>>   // Quality assurance: check that lengths of corresponding sides match.
>>       edge01 = length2(point[0], point[1]); // top
>>   edge12 = length2(point[1], point[2]);
>>   edge23 = length2(point[2], point[3]);
>>   edge30 = length2(point[3], point[0]);
>>   edge45 = length2(point[4], point[5]); // bottom
>>   edge56 = length2(point[5], point[6]);
>>   edge67 = length2(point[6], point[7]);
>>   edge74 = length2(point[7], point[4]);
>>   edge04 = length2(point[0], point[4]); // sides
>>   edge15 = length2(point[1], point[5]);
>>   edge26 = length2(point[2], point[6]);
>>   edge37 = length2(point[3], point[7]);
>>       epsilon = edge01 * 0.001;
>>       if      ((Math.abs(edge01 - edge23) > epsilon) ||
>>            (Math.abs(edge23 - edge67) > epsilon) ||
>>            (Math.abs(edge67 - edge45) > epsilon) ||
>>            (Math.abs(edge45 - edge01) > epsilon))
>>        Browser.println ('Warning, mismatched parallelopiped sides 02/33/45/67');
>>   else if ((Math.abs(edge30 - edge12) > epsilon) ||
>>            (Math.abs(edge12 - edge56) > epsilon) ||
>>            (Math.abs(edge56 - edge74) > epsilon) ||
>>            (Math.abs(edge74 - edge30) > epsilon))
>>        Browser.println ('Warning, mismatched parallelopiped sides 30/12/56/74');
>>   else if ((Math.abs(edge04 - edge15) > epsilon) ||
>>            (Math.abs(edge15 - edge26) > epsilon) ||
>>            (Math.abs(edge26 - edge37) > epsilon) ||
>>            (Math.abs(edge37 - edge04) > epsilon))
>>        Browser.println ('Warning, mismatched parallelopiped sides 04/15/26/37');
>> }
>> function length2 (pointA, pointB)
>> {
>>   return Math.sqrt((pointA.x - pointB.x)*(pointA.x - pointB.x) +
>>                    (pointA.y - pointB.y)*(pointA.y - pointB.y) +
>>                    (pointA.z - pointB.z)*(pointA.z - pointB.z));
>> }
>> function set_point (eventValue)
>> {
>>  // input eventValue received for inputOutput field
>>   point = eventValue;
>>   checkCoordinatePoints ();
>> }
>> "
>>               }
>>             }
>>           ]
>> 
>> How does it look?  I believe that this is the last major language feature to include, further work will be tuning/improving what is there.
>> 
>> =================================================
>> 
>> I was able to reduce some of the recursion in the stylesheet, and tried to nudge the memory settings in multiple ways, but the large scenes provoking out-of-memory errors were unimpressed and continue to explode in the same amount of time as before... will continue looking at those configurations.
>> 
>> =================================================
>> 
>> Closer and closer... comments and improvements remain appreciated and welcome.
>> 
>> 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
>