Block Shapes

Blockshapes are essentially block geometries or models that are hard-coded into vanilla, meaning that they exist without having accessible files.

Application ​

They are added in the resource pack's file, blocks.json, using child "blockshape" in a block's object. This would look something like this:

"wiki:invisible_aluminium_ore": {
  "blockshape": "invisible",
  "sound": "stone",
  "textures": "invisible_aluminium_ore"
}

List of known Blockshapes ​

Original Credit