Before revision:  We present the first detailed investigation of the fundamental problem of 3D stroke projection in AR/ VR. An assessment of the design requirements of real-time drawing of curves on 3D objects in AR/ VR is followed by the definition and classification of multiple techniques for 3D stroke projection.
After revision:  We present the first detailed investigation of the fundamental problem of 3D stroke projection in AR/ VR. An assessment of the design requirements of real-time drawing of curves on 3D objects in VR is followed by the definition and classification of multiple techniques for 3D stroke projection.