dont use a differnt color like a blue screen. That will degrade your shadows quality. just make the floor as white as possible and apply that image with the shadow ontop of whatever you want it on with a Multiply filter. A multiply filter removes all white from a scene based on its grayscale value. So perfect white is completely transparent, 50% gray is half transparent, and pure black has no trasparency.
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If the world that we are forced to accept is false and nothing is true, then everything is possible.
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