The effect allows you to deform a quad image using four relative vertices within the object.
Based on: https://iquilezles.org/www/articles/ibilinear/ibilinear.htm by Inigo Quilez
The four points of the quad deform are the X,Y parameters for the effect. The parameters are relative to the size (width, height) of the original quad / image. 0,0 is the top left. 1,1 is the bottom right.
The effect then maps the original texture of the object (usually a sprite) to the deformed quad.
The deformed quad will not be rendered outside the bound of the original quad.
However, a couple of helper functions detailed in the examples allows a quad to be resized and rendered anywhere in the layout with any size vertices (including flipped and convex.)
Check out the effect and example project w/ the helper functions, if you do something interesting with it, please post a picture in the thread.
Addon and examples