Description of the new feature / enhancement

Good day! I would like to add specular material compatibility to this mod, improving the alpha channel. Please copy-paste it to the Pteron diffuse asset:

Proposed technical implementation details

pteron.zip

Thank you. Kindly read contributiing.md, code_of_conduct.md and styleguide.md. These are boilerplate.

To make it clear, the proper alpha allows us to make a proper shine. There are complaints right now that new shaders make this part completely shiny because its alpha channel is white.
Before: https://i.imgur.com/gBHmfE5.png
After: https://i.imgur.com/W9R1H9E.png

#49