[x3d-public] I played a little. Re: Scene AccessInterface:autogeneratingPython. Release X3DPSAIL to public?
John Carlson
yottzumm at gmail.com
Fri Aug 11 10:34:56 PDT 2017
Thanks to everyone who got this code running. A bit of community work got my brain working, and I found a solution in my serializer. Are we due for an announcement of X3DPSAIL, or Python for X3DJSAIL (PY4X3DJSAIL)? I can start collecting documentation, but I’d like someone to test more. See:
https://github.com/coderextrextreme/pythonSAI
In particular, people should compare the .x3d’s to the generated .new.x3d’s. I can provide assistance, but really someone should test besides the developer.
Yes, there are a few bugs left over for us to fix, but I’m not sure if the fixes are in X3DPSAIL or X3DJSAIL—or just by modifying the python code for non-ASCII characters.
Also, we need to decide on how to document a Python SAI interface standard? Can it be based on the X3DJSAIL Javadoc? Minus chaining of course.
Maybe we could follow along with the OM4X3D naming, PY4X3D, J4X3D, JS4X3D, C4X3D, C++4X3D, C#4X3D.
Also, we need to fix this error:
File "TextSpecialCharacters.py", line 96
SyntaxError: Non-ASCII character '\xce' in file TextSpecialCharacters.py on line 96, but no encoding declared; see http://python.org/dev/peps/pep-0263/ for details
Someone can look into this for me.
Thanks for your help! Happy Pythoning!
John
Sent from Mail for Windows 10
From: John Carlson
Sent: Friday, August 11, 2017 12:54 PM
To: Don Brutzman
Cc: Roy Walmsley; Myeong Won Lee; X3D Graphics public mailing list; aono at tut.jp
Subject: RE: I played a little. Re: Scene AccessInterface:autogeneratingPython
Don, the problem is that the interface method setDEF() return type overrides the implementing class’ return type. I think perhaps the interface methods should go *last* in the chain. I will think about how to do this in my serializer. Why does this work in Java and Nashorn?
Meanwhile, I think unchaining the set methods should do the trick for Python (crosses fingers).
New Python Serializer checked in here:
https://github.com/coderextreme/pythonSAI/blob/master/PythonSerializer.js
Thanks,
John
Sent from Mail for Windows 10
From: John Carlson
Sent: Friday, August 11, 2017 12:13 PM
To: Masaki Aono
Cc: Roy Walmsley; Don Brutzman; Myeong Won Lee; X3D Graphics public mailing list
Subject: RE: I played a little. Re: Scene Access Interface:autogeneratingPython
Masaki,
Thank you for putting up with errors in my code. I have a new HelloWorld.py for you to try. It may work for you, but it doesn’t work for me. I get different errors. Could you tell me how you set your CLASSPATH to include X3DJSAIL? I think I accidentally removed that from my code. Oops!
Thanks!
Attached.
John
$ python HelloWorld.py
Traceback (most recent call last):
File "HelloWorld.py", line 2, in <module>
from X3Dautoclass import *
File "C:\Users\coderextreme\X3DJSONLD\src\main\python\X3Dautoclass.py", line 320, in <module>
X3DObject = autoclass('org.web3d.x3d.jsail.Core.X3DObject')
File "C:\Users\coderextreme\AppData\Local\Programs\Python\Python36\lib\site-packages\jnius\reflect.py", line 158, in autoclass
c = find_javaclass(clsname)
File "jnius\jnius_export_func.pxi", line 25, in jnius.find_javaclass (jnius\jnius.c:16918)
jnius.JavaException: Class not found b'org/web3d/x3d/jsail/Core/X3DObject'
Sent from Mail for Windows 10
From: John Carlson
Sent: Friday, August 11, 2017 11:49 AM
To: Masaki Aono
Cc: Roy Walmsley; Don Brutzman; Myeong Won Lee; X3D Graphics public mailing list
Subject: Re: I played a little. Re: Scene Access Interface: autogeneratingPython
Thanks everyone for looking at my code. I think the issue might be a previous set() function defined in the interface returns the interface class type, and then a new set function is called on the interface. This can be checked by separating the calls to set...() functions into separate calls on the numbered on the numbered object, so they are not chained together. This can be tested by hand modifying HelloWorld.py and removing the chaining and putting each set() call in a separate statement. I will try to modify my serializer to do this when I get the chance. I believe a previous serializer did do this, and it worked!
John
On Aug 11, 2017 11:18 AM, "John Carlson" <yottzumm at gmail.com> wrote:
Masaki, thank you for spending more time with this. I don't think the functions will be implemented soon by me. It is complaining about the interface, and the functions are defined in the concrete class ...Object which implements the interface. I don't think the functions should be declared on the interface, but I could be wrong. Don? It is possible that a previous set function returns the interface instead of the concrete class object, but I think not, last I checked.
There's something with pyjnius or how X3Dautoclass.py is implemented.
We really need input from the pyjnius community I think. Or reading of various pyjnius documentation.
I believe my https://GitHub.com/coderextreme/pythonSAI project has the beginnings of a pure Python SAI generator that may be worth looking at.
On Aug 11, 2017 10:35 AM, "Masaki Aono" <aono at tut.jp> wrote:
Dear John,
Thank you very much.
I think I begin to understand what is happening beneath the HelloWorld.py.
I could partly succeeded in X3D file output with X3D0.setScene(Scene25)
from your HelloWorld.py for the functions already implemented (by pynius?) as attached.
Hopefully, missing functions are to be implemented soon.
When I say "not finding" it means the functions are implemented. See X3DJSAIL jsail package.
Sincerely,
---------------------------------------------------------------
Minor errors I met (other than :ViewpointObject)
AttributeError: 'org.web3d.x3d.sai.Shape.X3DMaterialNode' object has no attribute 'setDiffuseColor'
AttributeError: 'org.web3d.x3d.sai.Texturing.X3DTextureNode' object has no attribute 'setUrl'
AttributeError: 'org.web3d.x3d.sai.Grouping.Transform' object has no attribute 'addChild'
On 2017/08/11 21:50, John Carlson wrote:
On Aug 11, 2017 8:13 AM, "Masaki Aono" <aono at tut.jp> wrote:
I believe that pyjnius is not finding setCenterOfRotation on ViewpointObject.
John
>>> Viewpoint28 = ViewpointObject().setDEF("ViewUpClose").setCenterOfRotation([0,-1,0]).setDescription("Hello world!").setPosition([0,-1,7])
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AttributeError: 'org.web3d.x3d.sai.Navigation.X3DViewpointNode' object has no attribute 'setCenterOfRotation'
At this point, I encountered the above error.
It looks like "setCenterOfRotation" may not be in X3DViewpointNode (I may be wrong).
Please note that Python 3.6 (which is not Python 2.7) is not a problem here, I think.
Sincerely,
On 2017/08/11 8:11, John Carlson wrote:
Here is HelloWorld.py as generated from my PythonSerializer.js. Note that I do not use chained calls.
This is because I was trying to get pyjnius to work. If we had some way of getting code like this running, it would be great. I could modify my PythonSerializer.js and perhaps include the serializer in X3DJSAIL.
My JavaScript serializer does not work in X3DJSAIL yet, and I have not been working on it since my initial attempt. I have compatible, containable changes to the X3DJSAIL stylesheet so that X3DJSAIL should be able to generate JavaScript “SAI”/Nashorn application code.
The problem appears to be getting the JavaScript XML parsers integrated with X3DJSAIL. We may be able to use JSON instead: XML -> JSON -> DOM -> python. The long way around, instead of XML -> DOM -> python.
Or we can just use my serializer in JavaScript, and translate JSON -> DOM -> python. The XML to JSON would be handled by X3dToJson.xslt (X3DJSAIL).
I do have examples of Java -> TypeScript and JavaScript, but they don’t work.
I do not have a Java -> Python translator. Good luck finding one.
John
Sent from Mail for Windows 10
From: Don Brutzman
Sent: Thursday, August 10, 2017 5:31 PM
To: Myeong Won Lee; Masaki Aono; Roy Walmsley; John Carlson
Cc: X3D Graphics public mailing list
Subject: Scene Access Interface: autogenerating Python
Myeong Won Lee and Masaki Aono:
Thank you for meeting today to discuss X3D Object Model transformation by applying an XSLT stylesheet to autogenerate of SAI codebases.
Myeong Won Lee, I also thought that your Unity HAnim player is wonderful. I recommend that you include some examples in the public release, they will generate strong interest. Having some public examples while also allowing private examples provides appealing choices and the best possible support for your students.
Here is summary excerpted from this week's Web3D meeting report.
================================================================
3. Object Model for X3D (OM4X3D)
a. The Object Model for X3D (OM4X3D) is a full set of object-oriented interfaces for all nodes, fields and statements in the X3D Abstract Specification.
b. OM4X3D is produced by decorating the X3D XML Schema with carefully structured annotations that describe the entire object-oriented nature of the X3D scene graph. http://www.web3d.org/specifications/OM4X3D/ObjectModelForX3dCreation.png
c. Instantiation: Object Model for X3D definitions are explicitly listed in X3DObjectModel 3.3.xml with corresponding XML schema x3dObjectModel.xsd
d. Ongoing public/private dialog using the x3d-public at web3D.org mailing list and presentation at Web3D 2017 Conference has been productive. http://www.web3d.org/specifications/OM4X3D/ObjectModelForX3dMasterClassWeb3dConference2017June7.pdf
e. Demonstration of strict object model in X3D JSON Encoding, which is 98% complete and undergoing extensive review and testing, initial-draft specification has been prepared.
f. Initial implementations are available in JavaScript, Java, and C++. Also planning to prepare programming-language implementations for C, C#.
g. Two new versions for Python are started, with dialog occurring to discern best practices.
h. SAI no longer just Script node in Browser object, includes full application-oriented API. This will lead to some changes and generalizations in 19775-2 Abstract SAI specification.
i. Multiple emerging SAI specifications and implementations are shown on updated draft X3D Specifications Relationships diagram (attached)
j. Implementation: X3D JSON Loader (X3DJSONLD) https://github.com/coderextreme/X3DJSONLD
k. Implementation: X3D Java Scene Access Interface Library (X3DJSAIL) http://www.web3d.org/specifications/java/X3dJavaSceneAuthoringInterface.html
l. Under consideration: integration into X3D Abstract Specification 19775-1 to more thoroughly expand on current abstract interface hierarchy.
m. Emerging capability: coherent X3D center, multiple different programming languages that offer common design patterns to programmers to create identical scene graphs.
================================================================
The essence of autogeneration is that proper code patterns must first exist. Once we get a few classes with the design patterns of interest, and generation of a few classes, then creation of all classes follows in a straightforward manner.
I recommend that the first example we work with is HelloWorld.x3d into .c .cpp .cs and .py source.
http://www.web3d.org/x3d/content/examples/HelloWorld.x3d
http://www.web3d.org/x3d/content/examples/HelloWorld.html
Regarding Python: John Carlson has done intriguing work that auto-translates Java source in X3DJSAIL to Python. This is interesting because it would keep the codebases closely aligned, making it easier to learn and debug. Consistency is easily maintained across X3D versions and X3D bugfixes by re-running each distribution. Flexibility is also possible since each codebase will include custom utility classes, methods and examples.
Next steps for Python: recommend that we
- Examine Masaki's work and compare it with the pyjnius conversions.
- Autogenerate Python library (X3DPSAIL perhaps?) to provide Python codebase support.
- Iterate until we have a good design pattern for HelloWorld and other exemplars.
- Create an X3dToPython.xslt stylesheet that can convert someModel.x3d to someModel.py source.
- run that across all scenes X3D Example Archives, detect and resolve errors, publish builds.
- make T-shirts 8)
As with JavaScript and Java, it is good to use the x3d-public list for this work. Also suitable for a weekly update reports and monthly telcon item for X3D Working Group.
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
--
******************************************************
青野雅樹
豊橋技術科学大学 情報・知能工学系
知識データ工学・情報検索研究室
〒441-8580 豊橋市天伯町雲雀ヶ丘1-1
TEL:(0532) 44-6764
FAX:(0532) 44-6757
Masaki Aono
Professor
Knowledge Data Engineering Laboratory
Dept. of Computer Science and Engineering
Toyohashi University of Technology
1-1 Hibarigaoka, Tempaku-cho,
Toyohashi-shi, Aichi 441-8580 JAPAN
TEL: 81+532-44-6764
FAX:81+532-44-6757
email: aono at tut.jp
******************************************************
--
******************************************************
青野雅樹
豊橋技術科学大学 情報・知能工学系
知識データ工学・情報検索研究室
〒441-8580 豊橋市天伯町雲雀ヶ丘1-1
TEL:(0532) 44-6764
FAX:(0532) 44-6757
Masaki Aono
Professor
Knowledge Data Engineering Laboratory
Dept. of Computer Science and Engineering
Toyohashi University of Technology
1-1 Hibarigaoka, Tempaku-cho,
Toyohashi-shi, Aichi 441-8580 JAPAN
TEL: 81+532-44-6764
FAX:81+532-44-6757
email: aono at tut.jp
******************************************************
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