Research on the Active Volume Rendering

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1 Development of High-Resolution Real-Time Volume Rendering Systems(1) A Parallel Volume Rendering System for Large-Scale Unstructured-GridWe have developed a cell-projection parallel volume rendering system for unstructured grid volume data. For this system, we have proposed a modified early ray termination scheme to prune the cell-projection of invisible cell. In order to alleviate load imbalance due, to view-dependency in scan-conversion and the dynamic behavior of early-ray termination, we have also implemented dynamic load balancing mechanism into this system.(2) A Parallel Volume Rendering System using Commodity Graphics HardwareWe have implemented a parallel volume rendering systems using commodity graphics hardware. In order to render large volume data with high frame rate, we have also implemented two kinds of data compression schemes : volume data compression based on adaptively sampling technique and intermediate-image compression to reduce communication time. Consequently, we could realize real time rendering of 512×512×1024 volume data using four commodity graphics hardware.(3) A Visualization AcceleratorWe have proposed a hardware architecture for scalable parallel volume rendering and developed a visualization accelerator prototype board (VisA Pro).2 Research on the Active Rendering SystemsWe have proposed a real-time simulation system for virtual experiments that realize the simultaneous visualization of simulation results. The proposed system basically belongs to the server-client model. However, not like the ordinary server-client model, the client part of the proposed system has responsible for the simulation of a region-of-interest (ROI) part and uses its simulation results for real-time user interaction, while preserving the accuracy of simulation by concurrently performing the simulation for the same region at the server and correcting the simulation results on the client. We call this simulation model "simulation caching."