So I am trying to learn how to create emissive masks. I've gotten everything just about done: I chose a test texture, created a mask in Photoshop (all parts show up as red that I do not want to glow in-world, and the vice versa for white), and saved as a targa (.tga) file. I have tested it in-world and... no emission, I can't even use the menu to change it, the dropdown is grayed out. What am I doing wrong? Can I get some advice? I am not new to texturing but I am new to this type of texturing. I have a feeling I am quite close to having this figured out, but I do not understand why it's not working in-world.