How do I make a Custom Overlay? I wish to make a custom overlay material but I really do not know how to do so. So far I have already finished my image and converted it to .tga format. I also gave the .tga the proper alpha channels so that it may be transparent. I have all the tools necessary to make vtf's. I have VTFedit, and the photoshop vtf plug in. So pretty much I believe I have everything needed. I have everything needed but I do not how to make the overlay its self. How would I do this?