diff --git a/src/stores/useModelStore.ts b/src/stores/useModelStore.ts
index e2f14ae..f2f01f6 100644
--- a/src/stores/useModelStore.ts
+++ b/src/stores/useModelStore.ts
@@ -242,6 +242,10 @@ interface ModelStore {
   renderMode: RenderMode;
   setRenderMode: (mode: RenderMode) => void;
 
+  /** Camera projection used in the viewer. Ortho is the default for CAD-style work. */
+  cameraMode: 'ortho' | 'persp';
+  setCameraMode: (m: 'ortho' | 'persp') => void;
+
   showGrid: boolean;
   setShowGrid: (show: boolean) => void;