Create/Update assets for version 1.21.3

assets/minecraft/models/block/heavy_core.json

@@ -0,0 +1,44 @@
+{
+  "display": {
+    "gui": {
+      "rotation": [ 30, 225, 0 ],
+      "translation": [ 0, 3, 0],
+      "scale":[ 1, 1, 1 ]
+    },
+    "ground": {
+      "rotation": [ 0, 0, 0 ],
+      "translation": [ 0, 3, 0],
+      "scale":[ 0.5, 0.5, 0.5 ]
+    },
+    "fixed": {
+      "rotation": [ 0, 180, 0 ],
+      "translation": [ 0, 4, 0],
+      "scale":[ 1, 1, 1 ]
+    },
+    "thirdperson_righthand": {
+      "rotation": [ 45, 45, 0 ],
+      "translation": [ 0, 3, 0 ],
+      "scale": [ 0.5, 0.5, 0.5 ]
+    }
+  },
+  "texture_size": [16, 16],
+  "textures": {
+    "all": "block/heavy_core",
+    "particle": "block/heavy_core"
+  },
+  "elements": [
+    {
+      "name": "heavy_core",
+      "from": [4, 0, 4],
+      "to": [12, 8, 12],
+      "faces": {
+        "north": {"uv": [0, 8, 8, 16], "texture": "all"},
+        "east": {"uv": [0, 8, 8, 16], "texture": "all"},
+        "south": {"uv": [0, 8, 8, 16], "texture": "all"},
+        "west": {"uv": [0, 8, 8, 16], "texture": "all"},
+        "up": {"uv": [0, 0, 8, 8], "texture": "all"},
+        "down": {"uv": [8, 0, 16, 8], "texture": "all"}
+      }
+    }
+  ]
+}