lol I was thinking of bending the space time... hmm, when a light ray bends, it travels along with it time along the path of say a prism. An object with a mass or a "solid" object let's say, travels at the same ratio of distance/ time no matter what distance it is traveling. Say you throw a snow ball, that snowball will hit the ground at the same time as another same size and weight ball is just dropped from the same height. Light works a little differently, and always travels a longer time along a path. Which is how you get the effect in real life from frosted or etched glass. The light bends and takes longer to finish it's travel, being refracted at different intervels.
But anyway, you are probably right that the calculations would be extreme and resource heavy. Too bad you can't just make a fresh calculation after the light has passed through the object, to get the frosted effect.
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