This update changes the depthscale behavior from the original Normalize method to an improved version that behaves well even when points are closely spaced.

Update art3d.py

Fixed line lengths, added handling of zero-length datasets when computing the data scale.

Updated art3d.py per feedback

Renamed get_data_scale and dscl to indicate that they are private, added description of function's purpose, and replaced np.power with np.sqrt.

Update art3d.py

Forgot this portion of the update earlier. Fixes the alpha draw order flipping as the point depth inverts even though the alpha should not change per point.

Update art3d.py per reviewer feedback

Only one dataset of (X, Y, Z) needs to be checked for zero length assuming all have the same length.
Instead of using a small constant in the denominator it's cleaner to just check for '_dscl==0' and return ones instead.
This applies for datasets with no datapoints, all the same datapoint such that no scale can be estimated.

Update art3d.py per reviewer feedback

Fixed some word wrapping, made get_data_scale more compact, replaced _dscl with the more descriptive _data_scale, removed redundant comments, added clearer comments for implementation of shading modes

Added kwargs for depth-shading

Create depthshading_improvement.rst

Update art3d.py formatting

Update axes3d.py formatting

Update depthshading_improvement.rst formatting

Remove legacy and inverted depth shade options

Remove depthshade getters

getter

make depthshade_minalpha kwarg only

kwarg order

getter

Update image test failures

Linting

fix masked scatter depth shading

removed depthshade check

fix tests

Fix build warning

Co-authored-by: Elliott Sales de Andrade <[email protected]>

Docstrings and typos

Code review updates

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