Texture projection to the unwrapped 3d face model

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I have unwrapped 3d model and wanna project a photo taken canon camera. When we use 3d applications for project, in every photo face location is different For example one of them is rotated his head 3 degree the other rotated other side 5 degree. Cuz of that 3d mesh and photo doesnt match I need to make it automaticaly. Do you suggest any code to match 3d model's eye to the eye in the photo.