"Shadow effect"?

[Outcast]

I am using a half invisible active object that is moving across the frame in a top down view to give the impression of a clouds shadow. But I am trying to come up with some way to make it look like it is changing and "bending" when it goes over objects. A bit like a real shadow would do, even though it does not have to be realistic.
Is it possible to do some kind of effect, maybe with a shader so it appears like a object is "bending" relating to the objects it goes over?

[happygreenfrog]

It might be possible with the lens object, or a shader, but it would probably be hard no matter what.

[Fanotherpg]

Ouch. There is Shadow extension (paid on one of Klikdiscs) but it won't make the Job AFAIR. In this case it would need to be a custom animation/shader activated for part of the object which collides with particular environment element :< Much simpler to achieve as additional active over character.

[Warmachine]

Another thing to try possibly would be to create a separate active and layer it accordingly. For example, say you have a tall tree, take the pixels of it, and cut down the width by about half then narrow it towards the top, THEN put your shadow on a different layer than your tree and set the x speed to taste. Should do the trick just probably requires more work.