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Moving Mask along a path
I have an image with a bunch of snowflake swirls on it and I want to have a mask travel along a path to make the snowflake swirls look like wisps of wind. I could keyframe it but then I dont get a constant speed.
I know I am going to need a bunch of mask but, how does one make a mask move along a path?
If it is possiable, could you explain in detail how I can acomplish this. Thanks a ton.