Fix 3D objects not being displayed in example of save_graphic

[tkoyama010]

Overview

resolves #4584

Main	PR

Details

• None

[codecov]

Codecov Report

Merging #4586 (213d51f) into main (54e75aa) will decrease coverage by 2.24%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #4586      +/-   ##
==========================================
- Coverage   95.77%   93.53%   -2.24%     
==========================================
  Files         127      127              
  Lines       21351    21354       +3     
==========================================
- Hits        20448    19974     -474     
- Misses        903     1380     +477     

[adeak]

Which change fixes the issue? Is it the render step that was missing before saving? We might consider pointing that out in the examples, or even making it an optional feature of the export.

[tkoyama010]

I began to think that it would be user-friendly to follow the screenshot approach. Please give me some time to consider this.

pyvista/pyvista/plotting/plotter.py

Lines 5714 to 5720 in 65042bc

	Examples
	--------
	>>> import pyvista
	>>> sphere = pyvista.Sphere()
	>>> plotter = pyvista.Plotter(off_screen=True)
	>>> actor = plotter.add_mesh(sphere)
	>>> plotter.screenshot('screenshot.png') # doctest:+SKIP

Edit: This seems to qualify as a bug.

[tkoyama010]

Rendering during first-time rendering solved this issue.