Clip mask

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  • 5 posts
  • "A clipping mask is a group of layers to which a mask is applied. The bottommost layer, or base layer, defines the visible boundaries of the entire group. For example, suppose you have a shape in the base layer, a photograph in the layer above it, and text in the topmost layer."

    Seems like this should be readily available, but I can't seem to find a way to do it.

    Any Ideas?


    Implementations using css, canvas clip, and webgl

  • If the mask is just a sprite, you could duplicate it for each layer and use blend modes. Just be sure the layer has "force own texture".

    The only other alternative would be to draw to a canvas or paster object for such grouping. I haven't been able to get the paster object to paste a layer at a time but the canvas plugin can, but doesn't use webgl. The flow would be to paste the two top layers first then paste the mask layer to a second canvas and then use a blendmode to paste to the first canvas.

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  • It's quite aggravating to try and figure out how to apply a blend mode when you have no idea how it will work.

    What goes over what, do I use separate layers, etc...

  • Got it to work: ... .capx?dl=0

    Could probably be improved somehow.

    A separate sprite as the boundary seems a bit of overkill.


    Thanks R0J0hound the force own texture was the part I needed.

  • For the record, you can also do this with the overlay shader without force own texture. It's a little different though. More suitable for lighting effects and such.

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