Compressability and and tensionable physics
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The ability to set squashability and stretchyiness to actors, as an attribute, it could be used for tons of physics based games and really push the awesomeness further. Such as, (when compression is < 13 , then spawn actor "lemon juice") It could also be used for explosions, and a threshold setting will allow better customisation. Actors could shrink and expand like an accordian, and with the cool current physics your engine will be T O P S!! Please keep this feature free, as switchers from game maker will be dissapaointed of having to pay.