Figure 1: A client/server 3D broadcasting application, with on-demand quantization to reduce bandwidth. The on-demand quantization workload is delayed to the GPU on the server side. AbstractThis paper presents an improved client-server system that increases the availability of remote 3D data. In order to reduce the required bandwidth, the data related to the appearance (color and normal) involved in the rendering of meshes and point clouds is quantized on-the-fly during the transmission to the final client, without reducing the geometric complexity. Our new quantization technique for the appearance that can be implemented on the GPU, strongly reduces the CPU load on the server-side and the transmission time is largely decreased.

Sketching, as an intuitive tool for creation and edition of 3D prototypes, is a topic of increasing interest to the community. These approaches are based on the natural ability of humans to quickly draw in 2D some characteristic curves of 3D objects. Unfortunately, some 3D modeling operations-like positioning different components-and the modeling in front of large displays have still not reached the same level of intuitively in sketching systems. The main difficulty is to leverage the intuitive 2D gesture abilities of humans and lift them to 3D operations. We present a new approach, based on a virtual 3D paper sheet metaphor and the use of a 6 degrees of freedom (DOF) device. With the associated interaction processes and visual feedbacks, it allows the user to quickly create and edit some sketched 3D models.