#91 Apparently, this is an invalid way to specify an Interpolator in X3DPSAIL Python app code

[John W Carlson]

Apparently, the key and keyValue are not maintained in output X3D encodings, using this:

CoordinateInterpolator24 = x3d.CoordinateInterpolator()
CoordinateInterpolator24.DEF = "ci"
CoordinateInterpolator24.key = [0,0.5,1]
CoordinateInterpolator24.keyValue = [(-23.495, 90.55, -8.13),(-28.825, 91.31, 0),(9.77497, 126.11, 0[snip]
Scene9.children.append(CoordinateInterpolator24)

I guess I'll have to revisit my Python Serializer.

Hmm!

[John W Carlson]

This also fails:

$ grep Interpolator flipp.py|cut -c1-100
ScalarInterpolator23 = x3d.ScalarInterpolator(key=[], keyValue=[])
ScalarInterpolator23.DEF = "si"
ScalarInterpolator23.key = [0,0.5,1]
ScalarInterpolator23.keyValue = [0,1,0]
Scene9.children.append(ScalarInterpolator23)
CoordinateInterpolator24 = x3d.CoordinateInterpolator(key=[], keyValue=[])
CoordinateInterpolator24.DEF = "ci"
CoordinateInterpolator24.key = [0,0.5,1]
CoordinateInterpolator24.keyValue = [(-23.495, 90.55, -8.13),(-28.825, 91.31, 0),(9.77497, 126.11, 0[snip]
Scene9.children.append(CoordinateInterpolator24)

I don't get it. Clueless at this point.

[John W Carlson]

I've been looking at x3d.py. Nothing pops out.

[John W Carlson]

Here's a fairly short program that shows the issue. Feel free to truncate the keyValue a bit.

[John W Carlson]

For example, interp2.py, attached, works.

[John W Carlson]

It's got something to do with the DEF. When I take out the DEF from the Interpolators, I do get key and keyValue.

Hmm

[John W Carlson]

This seems like a half decent solution.

[Don Brutzman]

There is not a problem with x3d.py

Here are two examples showing Python programming with CoordinateInterpolator and CoordinateInterpolator2D

• https://www.web3d.org/x3d/content/examples/X3dForWebAuthors/Chapter07EventAnimationInterpolation/DolphinMorpherIndex.html
• https://www.web3d.org/x3d/content/examples/X3dForWebAuthors/Chapter07EventAnimationInterpolation/CoordinateInterpolator2dExampleIndex.html

and, in general,

• meta title PythonX3dSmokeTests.py
• meta identifier https://www.web3d.org/x3d/stylesheets/python/examples/PythonX3dSmokeTests.py
• version control https://sourceforge.net/p/x3d/code/HEAD/tree/www.web3d.org/x3d/stylesheets/python/examples/PythonX3dSmokeTests.py

---

[John W Carlson]

Yes, I was able to verify that the X3dToPython.xslt version worked. I will
work towards putting DEF/USE as a constructor parameter. This seems to fix
the problem in one case.

John

On Sun, Feb 8, 2026 at 11:30 AM Don Brutzman brutzman@users.sourceforge.net
wrote:

There is not a problem with x3d.py

Here are two examples showing Python programming with
CoordinateInterpolator and CoordinateInterpolator2D

-
https://www.web3d.org/x3d/content/examples/X3dForWebAuthors/Chapter07EventAnimationInterpolation/DolphinMorpherIndex.html
-
https://www.web3d.org/x3d/content/examples/X3dForWebAuthors/Chapter07EventAnimationInterpolation/CoordinateInterpolator2dExampleIndex.html

and, in general,

• meta title PythonX3dSmokeTests.py
• meta identifier
  https://www.web3d.org/x3d/stylesheets/python/examples/PythonX3dSmokeTests.py
• version control
  https://sourceforge.net/p/x3d/code/HEAD/tree/www.web3d.org/x3d/stylesheets/python/examples/PythonX3dSmokeTests.py

------------------------------

[tickets:#91] https://sourceforge.net/p/x3d/tickets/91/ Apparently,
this is an invalid way to specify an Interpolator in X3DPSAIL Python app
code

Status: open
Milestone: X3D4
Created: Sun Feb 08, 2026 10:33 AM UTC by John W Carlson
Last Updated: Sun Feb 08, 2026 11:45 AM UTC
Owner: Don Brutzman

Apparently, the key and keyValue are not maintained in output X3D
encodings, using this:

CoordinateInterpolator24 = x3d.CoordinateInterpolator()
CoordinateInterpolator24.DEF = "ci"
CoordinateInterpolator24.key = [0,0.5,1]
CoordinateInterpolator24.keyValue = [(-23.495, 90.55, -8.13),(-28.825,
91.31, 0),(9.77497, 126.11, 0[snip]
Scene9.children.append(CoordinateInterpolator24)

I guess I'll have to revisit my Python Serializer.

Hmm!

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