Using the painting with brushesparadigm, users can modify the terrain while visualizing its shape evolution through the camera of their devices. Two interaction modes are supplied: the standard one and an augmented reality-based mode, which helps collaborators understand the 3D terrain shape. In this article, we describe an architecture for collaborative applications, which allow co-located users to sketch a terrain using their mobile devices concurrently. Moreover, collaborators have to visualize the terrain through 2D views, confusing novice users when conceiving its shape in 3D. 3D terrains used in digital animations and videogames are typically created by several collaborators with a single-user application, which constrains them to update the shared terrain from their PCs, using a turn-taking strategy.
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