I'm making a Minecraft texture pack. How do I make parts of blocks invisible?
So basically I want to make a Minecraft texture pack. I'm being noobish, and making it on MS paint because I have nothing better, and I want to know how I'd make some parts of a block invisible. Say if I took a milk bucket, and wanted to make it looks just like a glass of milk, or a bottle, and I wanted some parts of it to disappear so you'd see just the milk bottle, not just a milk bottle and a white bucket outline. How would I do this?