animating irregular shaped masks
this seems like it should be much easier than i am finding it.
what i want to be able to do is to be able to reveal the outline of a rectangle, from the top left corner, to the right top, to the right bottom, to the left bottom and up to the top left.
whenever i try to add a new element to the original masking layer it disregards it. i am tearing my hair out as this seems like it should be so simple.
any help would be very appreciated