From c40ae78174137e4ec144fcb8743fa2be5240d83c Mon Sep 17 00:00:00 2001
From: Victor Giers <mail@victorgiers.com>
Date: Sat, 18 Apr 2026 19:47:04 +0200
Subject: [PATCH] Add terrain validation and id registration in
 scene-document-validation.ts

---
 src/document/scene-document-validation.ts | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/src/document/scene-document-validation.ts b/src/document/scene-document-validation.ts
index 563c9051..8831eb7f 100644
--- a/src/document/scene-document-validation.ts
+++ b/src/document/scene-document-validation.ts
@@ -5703,6 +5703,24 @@ export function validateSceneDocument(
     validateScenePath(pathValue, path, diagnostics);
   }
 
+  for (const [terrainKey, terrain] of Object.entries(document.terrains)) {
+    const path = `terrains.${terrainKey}`;
+
+    if (terrain.id !== terrainKey) {
+      diagnostics.push(
+        createDiagnostic(
+          "error",
+          "terrain-id-mismatch",
+          "Terrain ids must match their registry key.",
+          `${path}.id`
+        )
+      );
+    }
+
+    registerAuthoredId(terrain.id, path, seenIds, diagnostics);
+    validateTerrain(terrain, path, diagnostics);
+  }
+
   for (const [modelInstanceKey, modelInstance] of Object.entries(
     document.modelInstances
   )) {