Scripting FR: Worldspace 3D HUD drawing

This is a bigger, longer term one. There are cases where I want script to draw shapes in the actual 3D scene. For instance, a red line or cylinder(semitransparent or wireframe) denoting the path of a beam that's about to fire, or a sphere around a target denoting blast radius or some other area of effect. Just being able to draw lines, spheres, cones, and cubes with the right options would create a lot of possibilities.