[x3d-public] Thoughts for x3d.py str() calls

Mon Oct 16 22:37:55 PDT 2023

YES! We are trying to construct XML and VRML.  That's pretty much all that
x3d.py does!

On Mon, Oct 16, 2023 at 10:29 PM Joe D Williams <joedwil at earthlink.net>
wrote:

> Sorry, I have no interest in trying to read and understand that listing.
> Regular user code is hard enough for me.
>
> What are you trying to do,anyway? Is the intent to generate x3d user code?
>
> Joe
>
> -----Original Message-----
> From: John Carlson <yottzumm at gmail.com>
> Sent: Oct 16, 2023 8:21 PM
> To: Joe D Williams <joedwil at earthlink.net>
> Cc: Brutzman Donald (Don) (CIV) <brutzman at nps.edu>, GPU Group <
> gpugroup at gmail.com>, Peitso Loren (CIV) <lepeitso at nps.edu>, X3D Graphics
> public mailing list <x3d-public at web3d.org>
> Subject: Re: Thoughts for x3d.py str() calls
>
>
> Okay, to be more "SAI"-like, and not use append, I present the
> following python, which admittedly, is more complicated than Doug's initial
> example.
>
>
> from x3d import *
>
> x3d = X3D()
> trans = Transform(DEF='C')
> grpa = Group(DEF='A', children=[trans])
> trans.DEF = None
> trans.USE = 'C'
> grpb = Group(DEF='B', children=[trans])
> scene = Scene(children=[grpa, grpb])
> x3d.Scene = scene
> blob = x3d.XML()
> print(blob)
>
>
>
> Output:
>
> x3d.py package 4.0.64.4 loaded, have fun with X3D Graphics!
> <?xml version="1.0" encoding="UTF-8"?>
> <!DOCTYPE X3D PUBLIC "ISO//Web3D//DTD X3D 4.0//EN" "
> https://www.web3d.org/specifications/x3d-4.0.dtd">
> <X3D profile='Full' version='4.0' xmlns:xsd='
> http://www.w3.org/2001/XMLSchema-instance' xsd:noNamespaceSchemaLocation='
> https://www.web3d.org/specifications/x3d-4.0.xsd'>
>   <Scene>
>     <Group DEF='A'>
>       <Transform USE='C'/>
>     </Group>
>     <Group DEF='B'>
>       <Transform USE='C'/>
>     </Group>
>   </Scene>
> </X3D>
>
> If you suggest that I change trans.DEF to something beside None, we can
> try that. I'll do that in my next message.
>
> Remember that the goal is to to produce fields which are order independent
> as output from x3d.py
>
> John
>
> On Mon, Oct 16, 2023 at 10:00 PM Joe D Williams <joedwil at earthlink.net>
> wrote:
>
>> Joeminion asks: So what is this other people's change thing.
>>
>> Is there somebody who knows the spec and wants to change something?
>>
>> What is to change?
>>
>> All any contributor has to do is show a better way.
>>
>>
>>
>> > Part of open source is accepting and incorporating other people’s
>> changes.
>>  Please think about how to improve x3d. The open part means you can read
>> the stuff, build tools around and in the stuff, experiment with it, and
>> maybe contribute. Hey, all it takes is a good idea that improves the
>> package.
>>
>> Joe
>>
>>
>>
>>
>>
>> -----Original Message-----
>> From: John Carlson <yottzumm at gmail.com>
>> Sent: Oct 16, 2023 7:13 PM
>> To: Brutzman, Donald (Don) (CIV) <brutzman at nps.edu>
>> Cc: GPU Group <gpugroup at gmail.com>, Joe D Williams <joedwil at earthlink.net>,
>> Peitso, Loren (CIV) <lepeitso at nps.edu>, X3D Graphics public mailing list
>> <x3d-public at web3d.org>
>> Subject: Re: Thoughts for x3d.py str() calls
>>
>>
>> Part of open source is accepting and incorporating other people’s
>> changes.  If you don’t do that, you’re not doing open source.
>>
>> John
>>
>> On Mon, Oct 16, 2023 at 8:28 PM Brutzman, Donald (Don) (CIV) <
>> brutzman at nps.edu> wrote:
>>
>>> Back to you guys… please use your friendly neighborhood python
>>> implementation to answer all these questions relating to code correctness
>>> and effectiveness.
>>>
>>>
>>>
>>>    - Wikipedia: Small matter of programming
>>>    - https://en.wikipedia.org/wiki/Small_matter_of_programming
>>>
>>>
>>>
>>> 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
>>> https://faculty.nps.edu/brutzman
>>>
>>>
>>>
>>> *From:* John Carlson <yottzumm at gmail.com>
>>> *Sent:* Monday, October 16, 2023 6:13 PM
>>> *To:* Brutzman, Donald (Don) (CIV) <brutzman at nps.edu>
>>> *Cc:* GPU Group <gpugroup at gmail.com>; Joe D Williams <
>>> joedwil at earthlink.net>; Peitso, Loren (CIV) <lepeitso at nps.edu>; X3D
>>> Graphics public mailing list <x3d-public at web3d.org>
>>> *Subject:* Re: Thoughts for x3d.py str() calls
>>>
>>>
>>>
>>> Don, there is no error in Doug’s python example.  We’re back to the
>>> multiple parent problem previously discussed.
>>>
>>>
>>>
>>> It is possible to set a flag in nodes that have been output and clear it
>>> afterwards.  It’s also possible to keep a map of DEFed outputted nodes and
>>> put in USE if the node has multiple parents discard the map afterwards. The
>>> latter may be preferred.
>>>
>>>
>>>
>>> Consider the case of a script handling several outputs from the same
>>> model.
>>>
>>>
>>>
>>> John
>>>
>>>
>>>
>>> On Mon, Oct 16, 2023 at 3:47 PM Brutzman, Donald (Don) (CIV) <
>>> brutzman at nps.edu> wrote:
>>>
>>> The x3d.py makes no effort to correct author errors.  That is up to the
>>> author.  Trying to “fix” things further can lead to further problems and a
>>> corrupted model.
>>>
>>>
>>>
>>> There are a great many models in X3D Examples with DEF and USE which run
>>> properly in unit tests.
>>>
>>>
>>>
>>> There are several diagnostics built in for reporting errors.  Have you
>>> tested your erroneous scene to see what you get?  If a further error
>>> diagnostic is needed, we can add it to the  X3DPSAIL TODO list.  If you
>>> write a python method to do that, we can test it further and possibly
>>> integrate it.
>>>
>>>
>>>
>>>    - X3D Python Scene Access Interface Library (X3DPSAIL), TODO
>>>    - https://www.web3d.org/x3d/stylesheets/python/python.html#TODO
>>>
>>>
>>>
>>> If a correct model is getting exported into another form incorrectly,
>>> then we can diagnose and fix the conversion.  As ever, use-case examples of
>>> such errors are essential to continuing progress.
>>>
>>>
>>>
>>> Thanks for all efforts with X3D Python.
>>>
>>>
>>>
>>> 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
>>> https://faculty.nps.edu/brutzman
>>>
>>>
>>>
>>> *From:* GPU Group <gpugroup at gmail.com>
>>> *Sent:* Monday, October 16, 2023 9:49 AM
>>> *To:* John Carlson <yottzumm at gmail.com>
>>> *Cc:* Brutzman, Donald (Don) (CIV) <brutzman at nps.edu>; Joe D Williams <
>>> joedwil at earthlink.net>; Peitso, Loren (CIV) <lepeitso at nps.edu>; X3D
>>> Graphics public mailing list <x3d-public at web3d.org>
>>> *Subject:* Re: Thoughts for x3d.py str() calls
>>>
>>>
>>>
>>> correction first output is
>>>
>>>   <Scene>
>>>
>>>     <Group DEF='A'>
>>>
>>>       <Transform DEF='C'/>
>>>
>>>     </Group>
>>>
>>>     <Group DEF='B'>
>>>
>>>       <Transform DEF='C'/>
>>>
>>>     </Group>
>>>
>>>
>>>
>>> On Mon, Oct 16, 2023 at 10:32 AM GPU Group <gpugroup at gmail.com> wrote:
>>>
>>> That may relate to the DEF USE issue with X3D.py:
>>>
>>> x x3d.py makes no effort to conjugate DEF and USE and properly order DEF
>>> before USE in its export stream
>>>
>>> - not a common problem unless a node has 2 fields that take the same
>>> node (directly SF or indirectly in MFNode descendent field)
>>>
>>> x it's a problem with HAnimHumanoid which has coordinate and skin
>>> fields, which typically involve the same Coordinate node
>>>
>>> - tinkering can be done in the blender exporter, to do a USE before a
>>> DEF,  but with inconvenience and messy code
>>>
>>> If a call can be made in x3d.py before exporting a DEF or USE, then that
>>> function can be over-ridden to take responsibility for DEF USE conjugation
>>> and correct output ordering something like this:
>>>
>>> node = getDefOrUse(node, node.DEF, node.USE)
>>>
>>> and for the x3d.py default it would just return the same element (or
>>> node), and overrides can do something more sophisticated.
>>>
>>>
>>>
>>> more..
>>>
>>> DEF USE NON-CONJUGATION IN X3D.PY
>>>
>>> test_def.py
>>>
>>> x3d = X3D()
>>>
>>> scene = Scene()
>>>
>>> x3d.Scene = scene
>>>
>>> grpa = Group(DEF='A')
>>>
>>> grpb = Group(DEF='B')
>>>
>>> scene.children.append(grpa)
>>>
>>> scene.children.append(grpb)
>>>
>>> trans = Transform(DEF='C')
>>>
>>> grpb.children.append(trans)
>>>
>>> grpa.children.append(trans)
>>>
>>> blob = x3d.XML()
>>>
>>> fp = open("dump.x3d","w+")
>>>
>>> fp.write(blob)
>>>
>>> fp.close()
>>>
>>>
>>>
>>> output:
>>>
>>> <?xml version="1.0" encoding="UTF-8"?>
>>>
>>> <!DOCTYPE X3D PUBLIC "ISO//Web3D//DTD X3D 4.0//EN" "
>>> https://www.web3d.org/specifications/x3d-4.0.dtd">
>>>
>>> <X3D profile='Full' version='4.0' xmlns:xsd='
>>> http://www.w3.org/2001/XMLSchema-instance
>>> <https://nam10.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.w3.org%2F2001%2FXMLSchema-instance&data=05%7C01%7Cbrutzman%40nps.edu%7C4181f75f38a24696882b08dbceae41c5%7C6d936231a51740ea9199f7578963378e%7C0%7C0%7C638331020060039666%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=MhoqazQK%2FlPhDhc%2BNJs6uMa7kFTpfKnJ1oGWwgxtakQ%3D&reserved=0>'
>>> xsd:noNamespaceSchemaLocation='
>>> https://www.web3d.org/specifications/x3d-4.0.xsd'>
>>>
>>>   <Scene>
>>>
>>>     <Group DEF='A'>
>>>
>>>       <Transform USE='C'/>
>>>
>>>     </Group>
>>>
>>>     <Group DEF='B'>
>>>
>>>       <Transform DEF='C'/>
>>>
>>>     </Group>
>>>
>>>   </Scene>
>>>
>>> </X3D>
>>>
>>>
>>>
>>> test_def_use.py
>>>
>>> from x3d import *
>>>
>>>
>>>
>>> x3d = X3D()
>>>
>>> scene = Scene()
>>>
>>> x3d.Scene = scene
>>>
>>> grpa = Group(DEF='A')
>>>
>>> grpb = Group(DEF='B')
>>>
>>> scene.children.append(grpa)
>>>
>>> scene.children.append(grpb)
>>>
>>> trans = Transform(DEF='C')
>>>
>>> grpb.children.append(trans)
>>>
>>> grpa.children.append(trans)
>>>
>>> blob = x3d.XML()
>>>
>>> fp = open("dump.x3d","w+")
>>>
>>> fp.write(blob)
>>>
>>> fp.close()
>>>
>>>
>>>
>>> output:
>>>
>>> <?xml version="1.0" encoding="UTF-8"?>
>>>
>>> <!DOCTYPE X3D PUBLIC "ISO//Web3D//DTD X3D 4.0//EN" "
>>> https://www.web3d.org/specifications/x3d-4.0.dtd">
>>>
>>> <X3D profile='Full' version='4.0' xmlns:xsd='
>>> http://www.w3.org/2001/XMLSchema-instance
>>> <https://nam10.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.w3.org%2F2001%2FXMLSchema-instance&data=05%7C01%7Cbrutzman%40nps.edu%7C4181f75f38a24696882b08dbceae41c5%7C6d936231a51740ea9199f7578963378e%7C0%7C0%7C638331020060039666%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=MhoqazQK%2FlPhDhc%2BNJs6uMa7kFTpfKnJ1oGWwgxtakQ%3D&reserved=0>'
>>> xsd:noNamespaceSchemaLocation='
>>> https://www.web3d.org/specifications/x3d-4.0.xsd'>
>>>
>>>   <Scene>
>>>
>>>     <Group DEF='A'>
>>>
>>>       <Transform USE='C'/>
>>>
>>>     </Group>
>>>
>>>     <Group DEF='B'>
>>>
>>>       <Transform DEF='C'/>
>>>
>>>     </Group>
>>>
>>>   </Scene>
>>>
>>> </X3D>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> On Mon, Oct 16, 2023 at 10:09 AM GPU Group <gpugroup at gmail.com> wrote:
>>>
>>> It seems possible to override functions in python, if there are just a
>>> few to override.
>>>
>>> And one suggestion for x3d.py imperfections is to apply fixes at runtime
>>> in some initialization function.
>>>
>>> - that assumes/requires just a few target functions, not 480 functions
>>> that need to be repaired
>>>
>>> - so for some fixes it may be helpful to change the upstream x3d.py to
>>> call a function that can be easily replaced.
>>>
>>> -Doug
>>>
>>> Example:
>>>
>>> file myclass.py
>>>
>>> class Wonky:
>>>
>>>   def __init__(self):
>>>
>>>     self.color = "Red"
>>>
>>>   def func1(self, color :str) -> bool:
>>>
>>>     if color == self.color:
>>>
>>>       return True
>>>
>>>     return False
>>>
>>>
>>>
>>> file override.py
>>>
>>> from myclass import *
>>>
>>>
>>>
>>> mc = Wonky()
>>>
>>> print("match with Blue? "+str(mc.func1("Blue")))
>>>
>>>
>>>
>>> def func2(self, color: str) -> bool:
>>>
>>>   if self.color != color:
>>>
>>>     return True
>>>
>>>   return False
>>>
>>> Wonky.func1 = func2 # <<<<<<<<<<<< OVERRIDE
>>>
>>> print("don't match with Blue? "+str(mc.func1("Blue")))
>>>
>>>
>>>
>>> output:
>>>
>>> match with Blue? False
>>>
>>> don't match with Blue? True
>>>
>>> -Doug
>>>
>>>
>>>
>>> On Mon, Oct 16, 2023 at 9:55 AM John Carlson <yottzumm at gmail.com> wrote:
>>>
>>> Instead of calling str() to print out a value, call a function that does
>>> precision floating point formatting on floats according to a user’s
>>> wishes.  If the value is a list, call the function recursively with a list
>>> comprehension, otherwise, call str.
>>>
>>>
>>>
>>> I think this is doable by mere humans.
>>>
>>>
>>>
>>> Thanks,
>>>
>>>
>>>
>>> John
>>>
>>>
>>
>
>
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