Feature Release: Circle Primitives!
To make a circle primitive, open the tools panel and click the Circle button under Primitives. The first trigger click sets the center point. The second trigger click sets the radius, orientation, and number of vertices.
To set the orientation and radius, after the first trigger click but before the second, simply rotate and move the controller in space.
To set the number of vertices, after the first trigger click but before the second, tilt the controller toward or away from the circle. When the controller is in the same plane as the circle you will have the minimum number of vertices, which is five. Yes, I know, that's a pentagon, not a circle, but this is 3d modelling in VR, not real life, so you get a pentagon and you'll like it!