A function to extract ROI (region of interest) with automatic LOD (level of detail) is incorporated to VFIVE, which is an interactive visualization software for the CAVE system, to visualize large scale data generated by computer simulations. The ROI extraction can be carried out interactively and intuitively in the CAVE system, and is recursive. The resolution of data for isosurface and volume rendering are always constant regardless of the size of the ROI. The processing time for visualization and the frame rate are kept roughly constant. The VFIVE with this function was used to visualize large scale data interactively in the CAVE system, and it worked successfully.

Many studies of real-time deformation simulation approach for elastic objects are intensively performed in the field of computer graphics and virtual reality (VR). In particular, in order to generate and present a tactile sensation when touching the elastic objects, it is necessary to perform deformation simulation with high frequency. Therefore, acceleration approaches for deformation simulation are required.

In this article, we introduce several real-time deformation simulation approaches; online re-mesh deformation simulation, multi-rate deformation simulation, embedded deformation simulation, an acceleration approach of corotated deformation simulation by adaptive rotation extraction and deformation simulation, and impulse deformation model. In addition, we also introduce examples of its medical application.

Particle method is not suitable for simple fluid analyses because of precision. On the other hand, the particle method can efficiently solve such problems which occur large deformation of the boundary surface and a lot of collision detections. In this article, a wheel rolling contact analysis for water droplet on a rail as the former analysis and a snow accretion analysis for a train bogie by flying snow in train running as latter are introduced. In this article, photorealistic visualization by the POV-Ray and a reduced model with calculation results by the 3D printer are introduced.

The high-energy particle detector simulator “Geant4” has excellent functions of visualization. Since the Geant4 visualizer should treat detectors with complex 3D structures, it is important to visualize polygon edges. Besides, transparent see-through visualization is also very effective. In this study, we develop a new Geant4 visualizer, which supports high-quality transparent rendering and highlighting polygon edges. We use the particle-based surface rendering for transparent visualization of a polygon mesh. Besides, we use the particle-based line rendering, which we propose in this paper, for highlighting polygon edges. Polygon meshes and polygon edges are converted into point data independently and then merged to make unified visualization.

As the first step towards patient-specific flatfoot surgery, this paper presented the finite element (FE) models of one flatfoot and one healthy foot and their weight-bearing simulations. The FE models were validated by comparing the plantar stress distributions between simulations and experiments. Stress transition trends towards healthy foot was summarized. Through simulations of medializing calcaneal osteotomy (MCO), we evaluated the influences of four surgical parameters. We found that the transverse osteotomy angle β and the translation distance d significantly affected the surgical performances. However, the surgical influence of the sagittal osteotomy angle α and the osteotomy position p can be ignored. In future, by increasing the number of case studies and utilizing postoperative data, we will further validate our FE models and the feasibility of surgical simulations. This work aims at providing useful information regarding optimal surgery and surgical parameters to flatfoot surgeons through FE simulations for realizing patient-specific surgery.