Improvements to glTF scatter export #210

Job	Run time
initial_checks / Load tox environments	5s
initial_checks / codestyle (ubuntu-latest)	18s
deploy-examples	0s
tests / Load tox environments	7s
tests / py39-test-all (ubuntu-latest)	3m 58s
tests / py310-test-all (ubuntu-latest)	3m 27s
tests / py311-test-all (ubuntu-latest)	3m 24s
tests / py312-test-all (ubuntu-latest)	3m 55s
tests / py312-test-qt (ubuntu-latest)	3m 29s
tests / py312-test-jupyter (ubuntu-latest)	2m 52s
tests / py39-test-all (macos-13)	11m 8s
tests / py310-test-all (macos-latest)	6m 47s
tests / py311-test-all (macos-latest)	5m 20s
tests / py312-test-all (macos-latest)	5m 45s
tests / py312-test-qt (macos-latest)	5m 27s
tests / py39-test-all (windows-latest)	8m 18s
tests / py310-test-all (windows-latest)	7m 36s
tests / py311-test-all (windows-latest)	7m 7s
tests / py312-test-all (windows-latest)	8m 54s
tests / py312-test-qt (windows-latest)	5m 27s
tests / py312-test-jupyter (windows-latest)	7m 27s
	1h 40m 51s

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