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I want to click on an object and move it with my mouse. I have a prefab object with a rigidbody & springjoint. I applied dragrigid body script to the prefab in the project view, i get following error: NullReferenceException: Object reference not set to an instance of an object DragRigidbody.Update () (at Assets\Standard Assets\Scripts\DragRigidbody.js:20)
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The DragRigidBody script doesn't go on the RigidBody you want to drag, it goes on a controller script such as First Person Controller. An in-depth explanation can be found here: http://answers.unity3d.com/questions/4898/drag-gameobject-with-mouse
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apply the rigidbody to the object you want to drag than select your camera and apply the drag rigidbody to the camera use mouse to drag
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Your answer
apply the script to the camera
first apply the rigidbody from component physics then apply the script to the camera
apply rigidbody to the object you want to drag