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Thickness Shader (SSS) as Alpha Mask

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I need to render wool yarn realliy close to the camera. I allready found this free shader as a base:

The yarn is relativly close to the Camera so there is a need to make it fuzzy or blurry on the edges.

The Fresnel shader an Alpha channel doesn´t work cause if the yarn points to the Camera it gets completly invisible

I need a shader based on thickness like SSS but I couldn´t figure out  how to create a clean Black and White mask from the SSS Shader.



How do I make the edges of the yarn transparent based on the POV of The Camera and the Thickness of the Geometry?


Thanks a lot

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