From c9fd7bcd6224f735651055c947b3680facbfc2d9 Mon Sep 17 00:00:00 2001
From: Victor Giers <mail@victorgiers.com>
Date: Sat, 11 Apr 2026 11:14:24 +0200
Subject: [PATCH] Validate player start navigation mode

---
 src/document/scene-document-validation.ts | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/document/scene-document-validation.ts b/src/document/scene-document-validation.ts
index 1522de86..73cb2e7c 100644
--- a/src/document/scene-document-validation.ts
+++ b/src/document/scene-document-validation.ts
@@ -9,6 +9,7 @@ import type { ModelInstance } from "../assets/model-instances";
 import { isModelInstanceCollisionMode } from "../assets/model-instances";
 import {
   isPlayerStartColliderMode,
+  isPlayerStartNavigationMode,
   getPlayerStartColliderHeight,
   type InteractableEntity,
   type PointLightEntity,
@@ -1152,6 +1153,17 @@ function validatePlayerStartEntity(
     );
   }
 
+  if (!isPlayerStartNavigationMode(entity.navigationMode)) {
+    diagnostics.push(
+      createDiagnostic(
+        "error",
+        "invalid-player-start-navigation-mode",
+        "Player Start navigation mode must be firstPerson or thirdPerson.",
+        `${path}.navigationMode`
+      )
+    );
+  }
+
   if (!isPlayerStartColliderMode(entity.collider.mode)) {
     diagnostics.push(
       createDiagnostic(