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A framework for sample-based rendering with O-buffers

A framework for sample-based rendering with O-buffers

引用

IEEE Conference on visualization

作者： Huamin Qu A. Kaufman Ran Shao A. Kumar Center for Visual Computing CVC and Department of Computer Science Stony Brook University Stony Brook NY USA

We present an innovative modeling and rendering primitive, called the O-buffer, for sample-based graphics, such as images, volumes and points. The 2D or 3D O-buffer is in essence a conventional image or a volume, respectively, except that samples are not restricted to a regular grid. A sample position in the O-buffer is recorded as an offset to the nearest grid point of a regular base grid (hence the name O-buffer). The offset is typically quantized for compact representation and efficient rendering. The O-buffer emancipates pixels and voxels from the regular grids and can greatly improve the modeling power of images and volumes. It is a semi-regular structure which lends itself to efficient construction and rendering. Image quality can be improved by storing more spatial information with samples and by avoiding multiple resamplings and delaying reconstruction to the final rendering stage. Using O-buffers, more accurate multi-resolution representations can be developed for images and volumes. It can also be exploited to represent and render unstructured primitives, such as points, particles, curvilinear or irregular volumes. The O-buffer is therefore a uniform representation for a variety of graphics primitives and supports mixing them in the same scene. We demonstrate the effectiveness of the O-buffer with hierarchical O-buffers, layered depth O-buffers, and hybrid volume rendering with O-buffers.

关键词： Rendering (computer graphics) Solid modeling computer graphics Layout Buffer storage Image sampling Image resolution Clouds Radio access networks computer science

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Empty space skipping and occlusion clipping for texture-based volume rendering

Empty space skipping and occlusion clipping for texture-base...

引用

IEEE Conference on visualization

作者： Wei Li K. Mueller A. Kaufman Center for Visual Computing (CVC) and Department of Computer Science Stony Brook University Stony Brook NY USA

We propose methods to accelerate texture-based volume rendering by skipping invisible voxels. We partition the volume into sub-volumes, each containing voxels with similar properties. Sub-volumes composed of only voxels mapped to empty by the transfer function are skipped. To render the adaptively partitioned sub-volumes in visibility order, we reorganize them into an orthogonal BSP tree. We also present an algorithm that computes incrementally the intersection of the volume with the slicing planes, which avoids the overhead of the intersection and texture coordinates computation introduced by the partitioning. Rendering with empty space skipping is 2 to 5 times faster than without it. To skip occluded voxels, we introduce the concept of orthogonal opacity map, that simplifies the transformation between the volume coordinates and the opacity map coordinates, which is intensively used for occlusion detection. The map is updated efficiently by the GPU. The sub-volumes are then culled and clipped against the opacity map. We also present a method that adaptively adjusts the optimal number of the opacity map updates. With occlusion clipping, about 60% of non-empty voxels can be skipped and an additional 80% speedup on average is gained for iso-surface-like rendering.

关键词： Rendering (computer graphics) Transfer functions Acceleration computer graphics Hardware computer science Engines Knee Head Torso

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Interactive flowing of highly viscous volumes in virtual environments

Interactive flowing of highly viscous volumes in virtual env...

引用

IEEE Annual International Symposium Virtual Reality

作者： Xiaoming Wei Wei Li A. Kaufman Center for Visual Computing (CVC) and Department of Computer Science State University of New York Stony Brook NY USA

We present a simple and linear 3D cellular automata approach for animating the behaviors of viscous flow volumes in virtual environments. An accurate modeling of fluid flow usually requires complicated physical simulations. In this paper, we concentrate on the behaviors of highly viscous fluids, such as wax, lava, plastic, metal, chocolate, etc. We animate the smooth behaviors of viscous fluid based on a local 3D cellular automata. The dynamic changing volume data is rendered directly on a VolumePro board or texture mapping hardware to achieve an interactive speed.

关键词： Animation Ice Virtual environment Fluid flow Equations Gravity Solids Testing computer science Computational modeling

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Melting and flowing of viscous volumes

Melting and flowing of viscous volumes

引用

computer Animation

作者： Xiaoming Wei Wei Li A. Kaufman Center for Visual Computing (CVC) and Department of Computer Science State University of New York Stony Brook NY USA

We present a simple, linear 3D cellular automata approach for animating the melting process of solid volumetric models. Accurate modelling of object melting usually requires complicated physical simulations of heat transfer and phase transition from solid to liquid. Instead, we propose a simplified model to describe the melting behaviors of highly viscous objects, such as wax, lava, plastic, metal and chocolate. We simulate the process by which a volumetric solid transforms into a viscous liquid as the amount of heat it accumulates on its surface reaches a certain temperature. We then animate smooth fluid behavior using a cellular automata. The dynamic volume data is rendered directly on texture mapping hardware to achieve an interactive speed.

关键词： Animation Solid modeling Computational modeling Heat transfer Microscopy Fluid flow Temperature Equations computer science Plastics

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Hardware assisted multichannel volume rendering

Hardware assisted multichannel volume rendering

引用

computer Graphics International

作者： Abhijeet Ghosh Poojan Prabhu A.E. Kaufman K. Mueller Center for Visual Computing and Computer Science Department Stony Brook University Stony Brook NY USA Fraunhofer-Institute of Computer Graphics Germany

We explore real time volume rendering of multichannel data for volumes with color and multimodal information. We demonstrate volume rendering of the visible human male color dataset and photorealistic rendering of voxelized terrains, and achieve high quality visualizations. We render multimodal volumes utilizing hardware programmability for accumulation level mixing, and use CT and MRI information as examples. We also use multiboard parallel/distributed rendering schemes for large datasets and investigate scalability issues. We employ the VolumePro 1000 for real time multichannel volume rendering. Our approach, however, is not hardware-specific and can use commodity texture hardware instead.

关键词： Hardware Rendering (computer graphics) computer graphics Humans Data visualization Computed tomography Magnetic resonance imaging Biomedical imaging Satellites Terrain mapping

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Ray tracing height fields

Ray tracing height fields

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computer Graphics International

作者： H. Qu F. Qiu N. Zhang A. Kaufman M. Wan Center for Visual Computing Department of Computer Science State University of New York Stony Brook NY USA Boeing Company Seattle WA USA

We present a novel surface reconstruction algorithm which can directly reconstruct surfaces with different levels of smoothness in one framework from height fields using 3D discrete grid ray tracing. Our algorithm exploits the 2.5D nature of the elevation data and the regularity of the rectangular grid from which the height field surface is sampled. Based on this reconstruction method, we also develop a hybrid rendering method which has the features of both rasterization and ray tracing. This hybrid method is designed to take advantage of GPUs newly available flexibility and processing power.

关键词： Ray tracing Rendering (computer graphics) Surface reconstruction Reconstruction algorithms Hardware Image reconstruction Image quality Pipelines computer graphics computer science

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Simulation studies for predicting surgical outcomes in breast reconstructive surgery

Simulation studies for predicting surgical outcomes in breas...

引用

Medical Image computing and computer-Assisted Intervention, MICCAI 2003 - 6th International Conference Proceedings

作者： Williams, Celeste Kakadaris, Ioannis A. Ravi-Chandar, K. Miller, Michael J. Patrick, Charles W. Visual Computing Lab. Dept. of Computer Science University of Houston Houston TX Dept. of Aerospace Engineering University of Texas at Austin Austin TX Dept. of Plastic Surgery UT M.D. Anderson Cancer Center Houston TX

Currently, there is no reliable method to accurately predict the outcome of breast reconstruction for an individual patient prior to surgery. To address this limitation, we are developing a simulation system capable of rendering patient-specific predictions of the post-operative breast shape. Such a system for the planning of breast reconstructive surgery will greatly enhance patient prognosis. In this paper, we present our computer simulations representing the reconstructed breast using idealized and realistic geometric models.

关键词： Surgery

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Experiential telepresence: How can telepresence research be guided towards better end user experience?

Experiential telepresence: How can telepresence research be ...

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2003 ACM SIGMM Workshop on Experiential Telepresence, ETP '03

作者： Hayes-Roth, Barbara Henderson, Austin Jain, Ramesh Manovich, Lev Welch, Greg Pingali, Gopal Extempo Systems Inc. United States MIT United States Systems Laboratory in the Advanced Concepts and Technology Group of Pitney Bowes United States School of Electrical and Computer Engineering College of Computing Georgia Institute of Technology United States Department of Computer Science and Engineering University of Michigan Ann Arbor MI United States University of California San Diego CA United States Visual Arts Department University of California San Diego CA United States Computer Science Department University of North Carolina Chapel Hill NC United States IEEE Computer Society ACM United States IBM T.J. Watson Research Center 19 Skyline Drive Hawthorne NY 10532 United States

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Transferring color to greyscale images 02

Transferring color to greyscale images

引用

ACM Transactions on Graphics;Proceedings of ACM SIGGRAPH 2002

作者： Welsh, Tomihisa Ashikhmin, Michael Mueller, Klaus Center for Visual Computing Computer Science Department SUNY Stony Brook NY United States

ISBN: (纸本)9781581135213

We introduce a general technique for "colorizing" greyscale images by transferring color between a source, color image and a destination, greyscale image. Although the general problem of adding chromatic values to a greyscale image has no exact, objective solution, the current approach attempts to provide a method to help minimize the amount of human labor required for this task. Rather than choosing RGB colors from a palette to color individual components, we transfer the entire color "mood" of the source to the target image by matching luminance and texture information between the images. We choose to transfer only chromatic information and retain the original luminance values of the target image. Further, the procedure is enhanced by allowing the user to match areas of the two images with rectangular swatches. We show that this simple technique can be successfully applied to a variety of images and video, provided that texture and luminance are sufficiently distinct. The images generated demonstrate the potential and utility of our technique in a diverse set of application domains.

关键词： Color computer graphics

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Simulating fire with texture splats

Simulating fire with texture splats

引用

VIS 2002, IEEE visualisation 2002

作者： Wei, Xiaoming Li, Wei Mueller, Klaus Kaufman, Arie Center for Visual Computing Department of Computer Science State Univ. of New York Stony Brook Stony Brook NY 11794-4400 United States

We propose the use of textured splats as the basic display primitives for an open surface fire model. The high-detail textures help to achieve a smooth boundary of the fire and gain the small-scale turbulence appearance. We utilize the Lattice Boltzmann Model (LBM) to simulate physically-based equations describing the fire evolution and its interaction with the environment (e.g., obstacles, wind and temperature). The property of fuel and non-burning objects are defined on the lattice of the computation domain. A temperature field is also incorporated to model the generation of smoke from the fire due to incomplete combustion. The linear and local characteristics of the LBM enable us to accelerate the computation with graphics hardware to reach real-time simulation speed, while the texture splat primitives enable interactive rendering frame rates.

关键词： computer graphics

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