Shader function "Camera cone transparency mask"

Function for creating a "truncated cone" mask in materials. 

Creates a circular transparent area in the direction of the camera view. Preserves the dynamic shadows of objects. Works in "Masked" blending mode. It has blurring of the mask borders, the blurring occurs not only around the perimeter of the truncated cone but also at the ends.

Settings:

- StopClip - distance from the camera to the far edge of the mask;

- StartClip - distance from the camera to the near border of the mask;

- RadiusStop - radius of the far border of the mask;

- RadiusStart - radius of the near border of the mask;

- Hardness and Intensity - control hardness and degree of border blurring respectively;

- HardDitherTaa - controls the UE DitherTemporalAA function (responsible for smooth transition of transparency in the "masked" blending mode).

 The function used a third-party function "MF_MaskByDistanceField" from the "UTC Shader Library" plugin.