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Fade in & out question
How can I fade in an object from left to right, or from top to bottom, or vice versa?
For example, if I placed a red rectangle in the middle of a photograph, and wanted it to appear by fading in from its left-side to its right-side, then disappearing by fading out from its left-side to its right-side, how would I go about doing this?
It seems like it should be something easy to do, but I can’t quite figure it out.
Thanks for the help.