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IntroductionThe mouse, based on the two-dimensional (2D) x-y coordinate system, was adopted as the standard input model for graphical interaction. Planar and pen/tablet-based interactions and multi-touch interfaces, which are similarly 2D, are commonly used by three-dimensional (3D) design software. These models of interaction increase the complexity of the Graphical User Interface (GUI) and make it difficult to design and interact within the 3D space. Also, they only provide a window of the 3D content, making impossible for the user to master spatial configuration and proportions. Although Virtual Reality (VR) seems to be a solution to this AbstractHybrid Virtual Environment 3D (Hyve-3D) is a system that allows architectural co-design inside Virtual Reality by a new model of interaction through a 3D cursor. It augments the concept of the cursor to better interact with threedimensional virtual spaces, rethinking it as a drawing/control plane and viewpoints inside the virtual world. Handheld tablets intuitively manipulate 3D cursors. Users can simultaneously access their individual complementary views on the tablets as personal windows into the shared immersive display. They can concurrently sketch in three dimensions, transform, and manipulate three-dimensional objects using the tablets as tangible props and collectively navigate the scene using the tablet as a 3D trackpad. The system implementation and co-design assessments of different settings are presented.

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