I still can't get my texture to show up. I changed it to "registerBlockIcons" which makes the error in the console output go away but my texture still doesn't show up.
What do I have to do, other than follow this tutorial to make it work? I'm not even trying to make the bucket work. I've just been trying to get my custom liquid to have a texture for like a week.
Sorry to revive an old thread, but did anyone figure it out? I am having the exact same problem. The registerIcons() function isn't being called, so my fluid just shows up without a texture.
Here's my code: