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

[GPU Group]

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' 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' 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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