  Three-dimensional immersive sketching for content creation and modeling has
been studied for some time. However, research in this domain mainly focused on
CAVE-like scenarios. These setups can be expensive and offer a narrow
interaction space. Building more affordable setups using head-mounted displays
is possible, allowing greater immersion and a larger space for user physical
movements. This paper presents a fully immersive environment using bi-manual
gestures to sketch and create content freely in the virtual world. This
approach can be applied to many scenarios, allowing people to express their
ideas or review existing designs. To cope with known motor difficulties and
inaccuracy of freehand 3D sketching, we explore proxy geometry and a laser-like
metaphor to draw content directly from models and create content surfaces. Our
current prototype offers 24 cubic meters for movement, limited by the room
size. It features infinite virtual drawing space through pan and scale
techniques and is larger than the typical 6-sided cave at a fraction of the
cost. In a preliminary study conducted with architects and engineers, our
system showed a clear promise as a tool for sketching and 3D content creation
in virtual reality with a great emphasis on bi-manual gestures.
