Merge pull request #6785 from Exolun/master

Optional predicate for pointerDragBehavior attach

dist/preview release/what's new.md

@@ -29,6 +29,7 @@
 - Added support for sound sprites [Doc](https://doc.babylonjs.com/how_to/playing_sounds_and_music#playing-a-sound-sprite) ([Deltakosh](https://github.com/deltakosh/))
 - Display Oculus Quest controller when using a Quest in WebVR ([TrevorDev](https://github.com/TrevorDev))
 - Added startAndReleaseDragOnPointerEvents property to pointerDragBehavior which can be set to false for custom drag triggering ([TrevorDev](https://github.com/TrevorDev))
+- Added optional picking predicate to pointerDragBehavior for filtering affected meshes ([Exolun](https://github.com/Exolun))
 - Effect renderer to render one or multiple shader effects to a texture ([TrevorDev](https://github.com/TrevorDev))
 - Added url parameters to web request modifiers ([PierreLeBlond](https://github.com/PierreLeBlond))
 - Added `VRExperienceHelper.exitVROnDoubleTap` ([Deltakosh](https://github.com/deltakosh/))

src/Behaviors/Meshes/pointerDragBehavior.ts

@@ -142,8 +142,9 @@ export class PointerDragBehavior implements Behavior<AbstractMesh> {
     /**
      * Attaches the drag behavior the passed in mesh
      * @param ownerNode The mesh that will be dragged around once attached
+     * @param predicate Predicate to use for pick filtering
      */
-    public attach(ownerNode: AbstractMesh): void {
+    public attach(ownerNode: AbstractMesh, predicate?: (m: AbstractMesh) => boolean): void {
         this._scene = ownerNode.getScene();
         this.attachedNode = ownerNode;
 
@@ -165,7 +166,7 @@ export class PointerDragBehavior implements Behavior<AbstractMesh> {
         // State of the drag
         this.lastDragPosition = new Vector3(0, 0, 0);
 
-        var pickPredicate = (m: AbstractMesh) => {
+        var pickPredicate = !!predicate ? predicate : (m: AbstractMesh) => {
             return this.attachedNode == m || m.isDescendantOf(this.attachedNode);
         };