minecraft-assets/assets/minecraft/blockstates/piston.json

{
  "variants": {
    "extended=false,facing=down": {
      "x": 90,
      "model": "minecraft:block/piston"
    },
    "extended=false,facing=east": {
      "y": 90,
      "model": "minecraft:block/piston"
    },
    "extended=false,facing=north": {
      "model": "minecraft:block/piston"
    },
    "extended=false,facing=south": {
      "y": 180,
      "model": "minecraft:block/piston"
    },
    "extended=false,facing=up": {
      "x": 270,
      "model": "minecraft:block/piston"
    },
    "extended=false,facing=west": {
      "y": 270,
      "model": "minecraft:block/piston"
    },
    "extended=true,facing=down": {
      "x": 90,
      "model": "minecraft:block/piston_base"
    },
    "extended=true,facing=east": {
      "y": 90,
      "model": "minecraft:block/piston_base"
    },
    "extended=true,facing=north": {
      "model": "minecraft:block/piston_base"
    },
    "extended=true,facing=south": {
      "y": 180,
      "model": "minecraft:block/piston_base"
    },
    "extended=true,facing=up": {
      "x": 270,
      "model": "minecraft:block/piston_base"
    },
    "extended=true,facing=west": {
      "y": 270,
      "model": "minecraft:block/piston_base"
    }
  }
}