Nakamura, MorihiroKoyama, YukiSakamoto, DaisukeIgarashi, TakeoEitan Grinspun and Bernd Bickel and Yoshinori Dobashi2016-10-112016-10-1120161467-8659https://doi.org/10.1111/cgf.13029https://diglib.eg.org:443/handle/10.1111/cgf13029We present an interactive design system for designing free-formed bamboo-copters, where novices can easily design freeformed, even asymmetric bamboo-copters that successfully fly. The designed bamboo-copters can be fabricated using digital fabrication equipment, such as a laser cutter. Our system provides two useful functions for facilitating this design activity. First, it visualizes a simulated flight trajectory of the current bamboo-copter design, which is updated in real time during the user's editing. Second, it provides an optimization function that automatically tweaks the current bamboo-copter design such that the spin quality-how stably it spins-and the flight quality-how high and long it flies-are enhanced. To enable these functions, we present non-trivial extensions over existing techniques for designing free-formed model airplanes [UKSI14], including a wing discretization method tailored to free-formed bamboo-copters and an optimization scheme for achieving stable bamboocopters considering both spin and flight qualities.I.3.6 [Computer Graphics]Methodology and TechniquesInteraction techniques.I.3.8 [Computer Graphics]ApplicationsI.3.5 [Computer Graphics]Computational Geometry and Object ModelingPhysically based modeling10.1111/cgf.13029323-332