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alpha masking / moving or resizing a mask
I'm working on a patch that reveal a picture, the idea is to have a picture revealed under a black layer, moving the mouse the user can see a portion of the image...
I've started combining an alpha mask actor with a foreground black layer, a background with the choosen image and a mask that is a PNG file, a little circle on transparent. Unfortunately, this doesn't work, it gives me unexpected results and I'm not able to move the mask "revealing" the image layer: if I de-zoom or move the image mask, the results it that moves also the wireframe around the mask! So the image is already revealed and the result is very bad! I am quite sure that is possible to have my goal done, and the only issue is that... I can't find the solution! someone out of there can help me?
macbook pro i7 / OXS 10.8.4 / isadora 1.3.1f06