Would you know how to do this in photoshop?
The effective theory works the same. In photoshop, for shadows you can:
a>use a drop shadow like effect - most of these come from plug ins for real use
b> use a duplicate of the object, blacked out and blurred - works well but can create weird shapes at perspective which need work
c> draw and blue your own shape roughly. .
The same effectively works in illy. The filters and effects? well one can be added to vectors, the other makes rasters. But the basis of a shadow of a falling object is a imprint blur of the object, so much like photoshop, copy, grey, opacity and blur. then scale it based on the distance....
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