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We present a prototype system for interactive construction and modification of 3D physical models using building blocks.Our system uses a depth sensing camera and a novel algorithm for acquiring and tracking the physical models. The algorithm,Lattice-First, is based on the fact that building block structures can be arranged in a 3D point lattice where the smallest block unit is a basis in which to derive all the pieces of the model. The algorithm also makes it possible for users to interact naturally with the physical model as it is acquired, using their bare hands to add and remove pieces. We present the details of our algorithm, along with examples of the models we can acquire using the interactive system. We also show the results of an experiment where participants modify a block structure in the absence of visual feedback. Finally, we discuss two proof-of-concept applications: a collaborative guided assembly system where one user is interactively guided to build a structure based on another user's design, and a game where the player must build a structure that matches an on-screen silhouette.
user interfaces, cameras, data acquisition, solid modelling, on-screen silhouette, interactive 3D model, 3D model acquisition, 3D model tracking, building block structure, interactive construction, interactive modification, 3D physical model, depth sensing camera, lattice-first algorithm, 3D point lattice, visual feedback, user interaction, collaborative guided assembly system, user design, Solid modeling, Lattices, Three dimensional displays, Computational modeling, Cameras, Image color analysis, Visualization, building block structures., Interactive physical model building, 3D model acquisition, object tracking, depth cameras

J. J. LaViola, Z. Kanzler, E. Charbonneau, B. White and A. Miller, "Interactive 3D Model Acquisition and Tracking of Building Block Structures," in IEEE Transactions on Visualization & Computer Graphics, vol. 18, no. , pp. 651-659, 2012.
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