It is not always desirable to show cloud shadows on a planet. Gas giant cloud layer add-ons look very bad when cloud shadows are enabled. It would be useful if cloud shadows could be disabled for individual objects. A new SSC file property is required, as there's no way for Celestia to automatically determine when cloud shadows are appropriate. It could be either a boolean property or a float point value giving the cloud shadow depth as a value between 0 and 1.
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