Nobuyuki Umetani's research while affiliated with The University of Tokyo and other places

... Our operations, however, work on strips and not quadrilaterals, and as such have a more global effect, and guarantee that the strip-decomposability of the mesh is maintained. In Noma et al. (2022), strip singularities are edited directly as scalar functions, but not as strip meshes. To the best of our knowledge, we are the first to perform topology editing on SDQ meshes. ...

... Instead, we integrate the learning of the color bases and the spatially varying weights into the NeRF optimization process, thereby enabling viewconsistent and 3D-aware editing. A recent work [33] proposes a palette-based recoloring method on NeRF with posterization. However, it is limited to non-photorealistic editing only. ...

... Source shape Aligned Target shape ment animation [18] and virtual try-on [9,32]. ...

... We can improve reconstruction quality to a point by increasing mesh density, at the cost of computational time. To further mitigate the issue, an area correction term can be added to the reconstruction, as shown by Ye et al. (2021). As high area distortion was not a significant issue for our dataset, we did not pursue this approach here for simplicity as it would imply tracking two functions instead of just one. ...

... The growth in digital fabrication access has signiicantly shaped HCI research. Motivated by the ethos of the Maker Movement and the opportunities of widespread and diverse fabrication technologies, HCI researchers have focused on developing easy-to-use digital fabrication design tools and fabrication techniques by simplifying digital design processes [39,52], enabling creators to reuse and remix existing 3D models [75,86,96], creating bridges between digital and physical representations [7,57,84], and automating the fabrication of complex assemblies such as mechanisms and joints [53,56]. Yet, despite the proliferation of digital fabrication equipment and extensive systems research aimed at novice-oriented digital fabrication tools, the actual impact of digital fabrication on design and production is unclear. ...

... Research fields where a precise mathematical description of the problem is difficult-if not impossible-stand much to gain from implementing ML solutions. Areas such as image processing [3,4] or text generation and analysis [5] have seen innovations that would not have been possible without the implementation of ML. ...

... In this section, two translation methods are presented that enable the aforementioned case model to form matrix data the model can recognize. There are various representation methods for geometric models, such as NURBS(Non-Uniform Rational B-Splines Modeling), point-based models, and triangle meshes [34]. However, these methods have large data sizes and complex structures, which greatly increase the complexity of the neural network. ...

... Closer to our concerns, Umetani et al. [35] proposed a furniture modeling system that actively guides the user to navigate valid regions of the design space; Bokeloh et al. [6] and Yumer et al. [37] developed modeling systems that preserve high-level structural and semantic relations in edited 3D models, while Koo et al. [23] proposed the use of functional specifications to map user prescriptions to constrained modeling for 'works-like' prototypes of furniture. We have been inspired by the work of Shugrina et al. [30], who precompute the domain defined by fabricability and functionality constraints to expose sliders with valid ranges to the user. ...

... In contrast to pre-programmed simulation (e.g., PhET [78,106], Explorable Explanations [10,98]), such improvisational sketching enables more flexible applications and encourages natural interaction for human-to-human communica- tion [64]. This dynamic sketching idea has been implemented for other application domains, such as animation authoring (e.g., Kitty [51], Draco [52], Apparatus [89], Motion Amplifiers [53], and other tools [99,110,111]) and dynamic data visualizations (e.g., SketchStory [64], NpakinVis [11], Data Illustrator [70], Transmogrification [9], and Drawing Dynamic Visualizations [100]). ...

... Guitar, flute [UPSW16], metallophone [BLT*15], and various 3D-printed musical instruments were created by artists and hobbyists because of their unique appearance and acoustic properties. Here, we optimized an electric guitar body under a planardistributed load, as shown in Figure 7. ...