what is my problem in setting blob shadow!!?

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Please, explain your problem, don’t just post a screenie! I can’t actually see anything wrong with this- it is all expected behaviour as far as I can tell. The projector will point in the ‘forward’ direction of the transform to which it is attached- which by the looks of things it is doing. Other than that, make sure your gradient material’s wrap mode is set to ‘clamp’ so that it doesn’t shine out the back of the projector.