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reticle is not working as a pointer

In my vuforia unity project I have copied reticle from AR-VR sample and attached with AR camera in my project. it works perfectly and serve as a reticle. I wanted to write pointer enter event when the reticle crosses 3d object which is produced upon image detection. I have attached physics ray cast with camera. The reticle is not working as a pointer. is there anything I missed?