Direction axis allow you to choose the main axis of the object
Visible angle defines maximun angle where Alpha value will be 100.0
Invisible angle defines minimum angle where Alpha value will be 0.0
Mode is switcher of function of transition from 0 to 100 between Invisible angle and Visible angle. Linear is just plain function. Smooth works with besier handler.
Easy near power is besier smoothness of 0.0 value
Easy far power is besier smoothness of 100.0 value
Inverse obviously flips 100.0 and 0.0 values
This script is useful for simple rectangles with sprites. To avoid sharp disappearing on 90 degrees, and mipmap flickering on degrees near 90.