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We present a system for quickly and easily designing three-dimensional (3D) models of botanical trees using freehand sketches and additional example-based editing operations. The system generates a 3D geometry from a twodimensional (2D) sketch using the assumption that trees spread their branches so that the distances between the branches are as large as possible. The user can apply additional gesture-based editing operations such as adding, cutting, and erasing branches. Our system alsodoi:10.1145/1281500.1281537 dblp:conf/siggraph/OkabeOI07 fatcat:iaoaa6pmzzbt5nb4foa3w4vhva