This document proposes a method for drawing in 3D using view-dependent silhouette strokes that can represent uncertainty and occlusion. It discusses previous work on 3D drawing that was limited to specific interfaces or primitives. The proposed approach models silhouette strokes as 3D curves with associated surfaces, and renders them from different viewpoints while managing occlusion. An interface allows drawing lines and silhouettes in empty space or on objects. Applications include illustration, annotation, and guided 3D design. Future work includes handling tubular objects and real-world testing in teaching anatomy.