Warn about missing dependency, but only once

packages/dev/core/src/Misc/devTools.ts

@@ -1,6 +1,11 @@
+const warnedMap: { [key: string]: boolean } = {};
 /**
  * @internal
  */
-export function _WarnImport(name: string) {
+export function _WarnImport(name: string, warnOnce = false) {
+    if (warnOnce && warnedMap[name]) {
+        return;
+    }
+    warnedMap[name] = true;
     return `${name} needs to be imported before as it contains a side-effect required by your code.`;
 }

packages/dev/core/src/scene.ts

@@ -89,6 +89,7 @@ import type { Animation } from "./Animations/animation";
 import type { Animatable } from "./Animations/animatable";
 import type { Texture } from "./Materials/Textures/texture";
 import { PointerPickingConfiguration } from "./Inputs/pointerPickingConfiguration";
+import { Logger } from "./Misc/logger";
 
 /**
  * Define an interface for all classes that will hold resources
@@ -5094,6 +5095,10 @@ export class Scene extends AbstractScene implements IAnimatable, IClipPlanesHold
         camera?: Nullable<Camera>,
         trianglePredicate?: TrianglePickingPredicate
     ): PickingInfo {
+        const warn = _WarnImport("Ray", true);
+        if (warn) {
+            Logger.Warn(warn);
+        }
         // Dummy info if picking as not been imported
         return new PickingInfo();
     }
@@ -5107,6 +5112,10 @@ export class Scene extends AbstractScene implements IAnimatable, IClipPlanesHold
      * @returns a PickingInfo (Please note that some info will not be set like distance, bv, bu and everything that cannot be capture by only using bounding infos)
      */
     public pickWithBoundingInfo(x: number, y: number, predicate?: (mesh: AbstractMesh) => boolean, fastCheck?: boolean, camera?: Nullable<Camera>): Nullable<PickingInfo> {
+        const warn = _WarnImport("Ray", true);
+        if (warn) {
+            Logger.Warn(warn);
+        }
         // Dummy info if picking as not been imported
         return new PickingInfo();
     }