Experimental test issue tracker

Nobody has claimed this yet.

The intention with this issue is to create an overview of the types of errors on the Experimental branch.

At the current state of the experimental branch (40c166153d0c6d 2026-02-16), the types of errors on the pytest suite is as follows.

```
196 GraphicalDeviationError
23 AssertionError
16 TypeError
9 AttributeError
8 NotImplementedError
7 assert False
3 Failed
1 NameError
1 _moderngl.Error
1 FileNotFoundError
1 Exception
5
```
The list was generated with the command:
```
cat experimental_errors.txt | grep FAILED | sed "s/FAILED \(.*\)::.* - \([^:]*\).*/\2/g" | sort | uniq -c | sort -nr
```

The dominating group of errors are the `GraphicalDeviationErrors`.
The errors in that group can be divided into the following groups.

- Larger surfaces differ due to differences in their fill (118 errors)
- Differences along edges of objects (67 errors)
- Differences in 3D viewpoint (8 errors)
- Variations in the rendered shape (5 errors)
- Unclassified (8 errors)

I have included a number of examples below.

Larger surfaces differ due to differences in their fill
Example with the test `tests/test_graphical_units/test_img_and_svg.py::test_Inheritance`

Differences along edges of objects
Example with the test `tests/test_graphical_units/test_geometry.py::test_AnnularSector`

Differences in 3D viewpoint

Example with the test `tests/test_graphical_units/test_polyhedra.py::test_ConvexHull3D`

Variations in the rendered shape

Example with the test `tests/test_graphical_units/test_functions.py::test_ImplicitFunction`

Start with the experimental pytest suite and the named examples in tests/test_graphical_units/test_img_and_svg.py, test_geometry.py, test_polyhedra.py, and test_functions.py. Reproduce the provided command against experimental_errors.txt, then organize the failures into agreed categories; done means the error overview and classifications are current and complete.

Written by the indexing model from the issue text.