"Funnel" or "perspective" scaling? Say I have a square and I want to make it into a trapezoid, I then scale down one of it's sides right?



Now what if instead of a square I have a very complex square-like object with lots of subdivisions? Is there any way to perform a similar operation? The one that will change the overall shape of the complex square-like object into a trapezoid-like object?



In Photoshop, when usint freeform transform tool this type of scaling is called "Perspective".
Add a Lattice and position it so that it encloses the object you want to deform.

Select the object to be deformed and add a Lattice Modifier to it.

On the modifier select the lattice that will be used.



Select the lattice, enter edit mode and change its shape by moving some vertices, the object will deform along with it.