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Here's my code snipet:

In construtor:
   blablabla ....
    gym = scene.addChildFromFile( "../resources/lhy_stadium/stadium.dae" , contentLayer ,ColladaLoader );

In loadCompleteEvent:
         mouse = new MouseCollision();           
         mouse.addCollisionWith( gym );


In renderEvent:

            if( mouse.test( Input3D.mouseX , Input3D.mouseY ) )
            {
                var info:CollisionInfo = mouse.data[0];

                do something
               
               
            }

I finally find a solution to this problem.
The cause of the problem is that the Bounding3D of all the Mesh3D objects and Surface3D of the ColladaLoader are empty!  (I think this is a bug , hope you can fix it in later versions. Thanks!)

So I added following function, the function postorder travering all the children of all the Mesh3D objects:

        private function updateBoundsForAllChildren( inPivot:Pivot3D ):void
        {
            // update leaf node
            if( inPivot.children.length == 0 )
            {
                if( inPivot is Mesh3D )
                {
                    var inMesh3D:Mesh3D = inPivot as Mesh3D;
                   
                    for each( var surf:Surface3D in inMesh3D.surfaces )
                    {
                        surf.bounds = new Boundings3D();
                        surf.updateBoundings();
                    }
                   
                    inMesh3D.bounds = new Boundings3D();                   
                    inMesh3D.updateBoundings();
                }
                return;
            }
           
            for each( var child:Pivot3D in inPivot.children )
            {
                updateBoundsForAllChildren( child );               
            }
           
            // update none leaf node
            if( inPivot is Mesh3D )
            {
                var inMesh3D2:Mesh3D = inPivot as Mesh3D;
               
                for each( var surf2:Surface3D in inMesh3D2.surfaces )
                {
                    surf2.bounds = new Boundings3D();
                    surf2.updateBoundings();
                }
               
                inMesh3D2.bounds = new Boundings3D();                   
                inMesh3D2.updateBoundings();
            }           
        }

Then after completely loaded the ColladaLoader, I added the following code:
            updateBoundsForAllChildren( gym ); //gym is an object of ColladaLoader

Then every works perfect!!

Hope this helps , Many Thanks !

Hi xfzhang, thanks for share this!

which version are you suing? we changed some things related to that...it should work fine in the next release.

thanks again!.

Thanks zfzhang. I was having the same problem with boundings returning null on collada models and found that looping through the objects children updating their boundings fixed the problem.

Thanks ! xfzhang, xfzhang