Block state data

There are block state files available by doing this :

mkdir /tmp/dminecraft
cp ~/.minecraft/versions/1.8.4/1.8.4.jar  /tmp/dminecraft
cd /tmp/dminecraft && unzip 1.8.4.jar
cd /tmp/dminecraft/assets/minecraft/blockstates

Example : birch_fence_gate.json :

{
    "variants": {
        "facing=south,in_wall=false,open=false": { "model": "birch_fence_gate_closed" },
        "facing=west,in_wall=false,open=false":  { "model": "birch_fence_gate_closed", "y": 90, "uvlock": true },
        "facing=north,in_wall=false,open=false": { "model": "birch_fence_gate_closed", "y": 180, "uvlock": true },
        "facing=east,in_wall=false,open=false":  { "model": "birch_fence_gate_closed", "y": 270, "uvlock": true },
        "facing=south,in_wall=false,open=true": { "model": "birch_fence_gate_open" },
        "facing=west,in_wall=false,open=true":  { "model": "birch_fence_gate_open", "y": 90, "uvlock": true },
        "facing=north,in_wall=false,open=true": { "model": "birch_fence_gate_open", "y": 180, "uvlock": true },
        "facing=east,in_wall=false,open=true":  { "model": "birch_fence_gate_open", "y": 270, "uvlock": true },
        "facing=south,in_wall=true,open=false": { "model": "birch_wall_gate_closed" },
        "facing=west,in_wall=true,open=false":  { "model": "birch_wall_gate_closed", "y": 90, "uvlock": true },
        "facing=north,in_wall=true,open=false": { "model": "birch_wall_gate_closed", "y": 180, "uvlock": true },
        "facing=east,in_wall=true,open=false":  { "model": "birch_wall_gate_closed", "y": 270, "uvlock": true },
        "facing=south,in_wall=true,open=true": { "model": "birch_wall_gate_open" },
        "facing=west,in_wall=true,open=true":  { "model": "birch_wall_gate_open", "y": 90, "uvlock": true },
        "facing=north,in_wall=true,open=true": { "model": "birch_wall_gate_open", "y": 180, "uvlock": true },
        "facing=east,in_wall=true,open=true":  { "model": "birch_wall_gate_open", "y": 270, "uvlock": true }
    }
}

Might be interesting for handling metadata/blockstate (and placing that kind of blocks)

Start by reviewing the extracted block-state files under assets/minecraft/blockstates, especially birch_fence_gate.json, and then inspect the repository's existing data entry points. The issue's intended outcome is to support block-state or metadata handling and placement, but it does not define the required API, files, or acceptance criteria.