Add the altar to world generation

src/main/resources/data/unicopia/worldgen/structure/altar.json

@@ -0,0 +1,15 @@
+{
+  "type": "minecraft:jigsaw",
+  "biomes": "#minecraft:has_structure/village_desert",
+  "max_distance_from_center": 80,
+  "project_start_to_heightmap": "WORLD_SURFACE_WG",
+  "size": 6,
+  "spawn_overrides": {},
+  "start_height": {
+    "absolute": 0
+  },
+  "start_pool": "unicopia:altar",
+  "step": "surface_structures",
+  "terrain_adaptation": "beard_thin",
+  "use_expansion_hack": true
+}

src/main/resources/data/unicopia/worldgen/structure_set/altars.json

@@ -0,0 +1,14 @@
+{
+  "placement": {
+    "type": "minecraft:random_spread",
+    "salt": 54386171,
+    "separation": 32,
+    "spacing": 64
+  },
+  "structures": [
+    {
+      "structure": "unicopia:altar",
+      "weight": 1
+    }
+  ]
+}

src/main/resources/data/unicopia/worldgen/template_pool/altar.json

@@ -0,0 +1,16 @@
+{
+  "elements": [
+    {
+      "element": {
+        "element_type": "minecraft:single_pool_element",
+        "location": "unicopia:altar/center_1",
+        "processors": {
+          "processors": []
+        },
+        "projection": "rigid"
+      },
+      "weight": 1
+    }
+  ],
+  "fallback": "minecraft:empty"
+}

src/main/resources/data/unicopia/worldgen/template_pool/altar_pillar.json

@@ -0,0 +1,82 @@
+{
+  "elements": [
+    {
+      "element": {
+        "element_type": "minecraft:single_pool_element",
+        "location": "unicopia:altar/pillar/pillar_0",
+        "processors": {
+          "processors": []
+        },
+        "projection": "rigid"
+      },
+      "weight": 1
+    },
+    {
+      "element": {
+        "element_type": "minecraft:single_pool_element",
+        "location": "unicopia:altar/pillar/pillar_1",
+        "processors": {
+          "processors": []
+        },
+        "projection": "rigid"
+      },
+      "weight": 1
+    },
+    {
+      "element": {
+        "element_type": "minecraft:single_pool_element",
+        "location": "unicopia:altar/pillar/pillar_2",
+        "processors": {
+          "processors": []
+        },
+        "projection": "rigid"
+      },
+      "weight": 1
+    },
+    {
+      "element": {
+        "element_type": "minecraft:single_pool_element",
+        "location": "unicopia:altar/pillar/pillar_3",
+        "processors": {
+          "processors": []
+        },
+        "projection": "rigid"
+      },
+      "weight": 1
+    },
+    {
+      "element": {
+        "element_type": "minecraft:single_pool_element",
+        "location": "unicopia:altar/pillar/pillar_4",
+        "processors": {
+          "processors": []
+        },
+        "projection": "rigid"
+      },
+      "weight": 1
+    },
+    {
+      "element": {
+        "element_type": "minecraft:single_pool_element",
+        "location": "unicopia:altar/pillar/pillar_5",
+        "processors": {
+          "processors": []
+        },
+        "projection": "rigid"
+      },
+      "weight": 1
+    },
+    {
+      "element": {
+        "element_type": "minecraft:single_pool_element",
+        "location": "unicopia:altar/pillar/pillar_6",
+        "processors": {
+          "processors": []
+        },
+        "projection": "rigid"
+      },
+      "weight": 1
+    }
+  ],
+  "fallback": "minecraft:empty"
+}