Invalid array length exception in Sandcastle Geometry and Appearances Example

- Open the Geometry and Appearances Sandcastle example
- Zoom in and look to the horizon.
- Grab the bottom/left of the sky atmosphere and use left-mouse drag to spin around 360 degrees and then look around.


CC #1477

Reproduce the issue in the Geometry and Appearances Sandcastle example by zooming to the horizon and dragging the bottom-left of the sky atmosphere through a 360-degree rotation. Inspect the resulting invalid array length exception and its stack trace; done means the interaction completes without throwing the exception.

Written by the indexing model from the issue text.