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Kanazawa K.,University of Tokyo | Tanabe R.,Tokyo Denki University | Moriya T.,Tokyo Denki University | Takahashi T.,Tokyo Denki University | Takahashi T.,UEI Research
ACM SIGGRAPH 2015 Posters, SIGGRAPH 2015 | Year: 2015

Realistic representation of nature scenes is one of the most challenging areas in computer graphics community. There are important factors to synthesize realistic scenes in 3D CG which are decayed materials such as dead trees, weathered statues, rusty metals and so on. We are interested in the methodology for simulating its decaying processes. In this paper, we propose a simple method for rust aging simulation based on a probabilistic cellular automaton model taking into account object's geometries. Source

Susaki M.,Tokyo Denki University | Sunagawa S.,Tokyo Denki University | Moriya T.,Tokyo Denki University | Takahashi T.,Tokyo Denki University | Takahashi T.,UEI Research
ACM SIGGRAPH 2013 Posters, SIGGRAPH 2013 | Year: 2013

There are a lot of people who have had yearning for conducting orchestra. It must be a very pleasant experience to coordinate orchestra performance with your own conduct, but it requires a vast amount of money. With such needs, there have been researches to simulate the situation of conducting orchestra by using gesture recognition [Usa][Baba][Sunagawa]. But, they do not generate performance scenes. Source

Huang C.-C.,National Taiwan University | Liang R.-H.,National Taiwan University | Liang R.-H.,Academia Sinica, Taiwan | Chan L.,National Taiwan University | And 2 more authors.
ACM SIGGRAPH 2014 Emerging Technologies, SIGGRAPH 2014 | Year: 2014

Hand tracking technologies allow users to control a remote display freely. The most prominent freehand remote controlling method is through a body-centric cursor, e.g. Kinect. Using that method, a user can first place the cursor to a rough position on the remote display, move the cursor to the exact position, and then commit the selection by a gesture. Although controlling the body-centric cursor is intuitive, it is not efficient for novel users who are not familiar with their proprioception. Inaccurate cursor placement results in long dragging movement, and therefore causes consequent arm fatigue problems. © 2014 held by the Owner/Author. Source

Kanazawa K.,University of Tokyo | Kanazawa K.,Tokyo Denki University | Sakato Y.,Tokyo Denki University | Takahashi T.,Tokyo Denki University | Takahashi T.,UEI Research
ACM SIGGRAPH 2013 Talks, SIGGRAPH 2013 | Year: 2013

To generate realistic representation of the nature scene is one of the most challenging areas in the computer graphics community. Ray tracing[1] is the most well-known technique to synthesize a realistic image. Since ray tracing is the most suitable method for simulating reflection and refraction of the light, it has been used for simulating atmospheric optical phenomena due to reflection and refraction of the light. The mirage is a kind of atmospheric optical phenomenon. Therefore, it is possible to synthesize mirages in 3DCG by simulating or modeling condition of the air. We focus on pencil tracing technique[2] that is an extention of conventional ray tracing technique based on the paraxial approximation theory. Our simple method based on pencil tracing can efficiently generate an appearance of mirage without any complex thermodynamic simulation. Source

Sato S.,UEI Research | Dobashi Y.,Hokkaido University | Yue Y.,Columbia University | Iwasaki K.,Wakayama University | Nishita T.,Hiroshima Shudo University
Visual Computer | Year: 2015

Physically based fluid simulations usually require expensive computation cost for creating realistic animations. We present a technique that allows the user to create various fluid animations from an input fluid animation sequence, without the need for repeatedly performing simulations. Our system allows the user to deform the flow field in order to edit the overall fluid behavior. In order to maintain plausible physical behavior, we ensure the incompressibility to guarantee the mass conservation. We use a vector potential for representing the flow fields to realize such incompressibility-preserving deformations. Our method first computes (time-varying) vector potentials from the input velocity field sequence. Then, the user deforms the vector potential, and the system computes the deformed velocity field by taking the curl operator on the vector potential. The incompressibility is thus obtained by construction. We show various examples to demonstrate the usefulness of our method. © 2015, Springer-Verlag Berlin Heidelberg. Source

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