Add example scene for ellipsoid terrain#70

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jqntn wants to merge 2 commits intoCesiumGS:mainfrom

jqntn:ellipsoid-terrain-example

Commits on Jun 12, 2024

add ellipsoid terrain sample scene
jqntn
committed

Commits on Jul 2, 2024

Merge remote-tracking branch 'origin/main' into ellipsoid-terrain-example
jqntn
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