scholarly journals GPU Volume Ray Casting of two Volumes within VTK

2012 ◽  
Author(s):  
Karl Krissian ◽  
Carlos Falcón-Torres
Keyword(s):  
Volume Rendering ◽  
Transfer Functions ◽  
Ray Casting ◽  
The Creation ◽  
Volume Ray Casting

We have modified the current VTK volume rendering on GPU to allow simultaneous rendering of two volumes, each of them with its own color and opacity transfer functions. These changes have led to the creation of two new C++ classes and several GLSL shaders. We explain the modifications made to the original classes and shaders and we discuss possible additional improvements. A C++ demo code shows how to use the new classes.

scholarly journals FOCAL REGION-BASED VOLUME RENDERING

2006 ◽  
Vol 20 (05) ◽  
pp. 665-677 ◽  
Author(s):  
JIANLONG ZHOU ◽  
ZHIYAN WANG ◽  
KLAUS D. TÖNNIES
Keyword(s):  
Volume Rendering ◽  
Contextual Information ◽  
Focal Region ◽  
Ray Casting ◽  
Volumetric Data ◽  
Data Set ◽  
Volume Of Interest ◽  
Bounded Volume ◽  
Volume Ray Casting ◽  
Main Components

In this paper, a new approach named focal region-based volume rendering for visualizing internal structures of volumetric data is presented. This approach presents volumetric information through integrating context information as the structure analysis of the data set with a lens-like focal region rendering to show more detailed information. This feature-based approach contains three main components: (i) A feature extraction model using 3D image processing techniques to explore the structure of objects to provide contextual information; (ii) An efficient ray-bounded volume ray casting rendering to provide the detailed information of the volume of interest in the focal region; (iii) The tools used to manipulate focal regions to make this approach more flexible. The approach provides a powerful framework for producing detailed information from volumetric data. Providing contextual information and focal region renditions at the same time has the advantages of easy to understand and comprehend volume information for the scientist. The interaction techniques provided in this approach make the focal region-based volume rendering more flexible and easy to use.

scholarly journals A Comparison between GPU-based Volume Ray Casting Implementations: Fragment Shader, Compute Shader, OpenCL, and CUDA

2017 ◽  
Vol 20 (2) ◽  
Author(s):  
Francisco Sans ◽  
Rhadamés Carmona
Keyword(s):  
Computer Graphics ◽  
Volume Rendering ◽  
Oil And Gas ◽  
Performance Comparison ◽  
Ray Casting ◽  
Volume Ray Casting ◽  
Area Of Study ◽  
A Performance

Volume rendering is an important area of study in computer graphics, due to its application in areas such as medicine, physic simulations, oil and gas industries, and others. The main used method nowadays for volume rendering is ray casting. Nevertheless, there are a variety of parallel APIs that can be used to implement it. Thus, it is important to evaluate the performance of ray casting in diferent parallel APIs to help programmers in selecting one of them. In this paper, we present a performance comparison using OpenGL® with fragment shader, OpenGL® with compute shader, OpenCL, and CUDA.

Interactive directional ambient occlusion and shadow computations for volume ray casting

2019 ◽  
Vol 84 ◽  
pp. 66-76 ◽  
Author(s):  
Leonardo Q. Campagnolo ◽  
Waldemar Celes
Keyword(s):  
Ray Casting ◽  
Ambient Occlusion ◽  
Volume Ray Casting

scholarly journals Accurate and efficient GPU ray‐casting algorithm for volume rendering of unstructured grid data

ETRI Journal ◽  
2020 ◽  
Vol 42 (4) ◽  
pp. 608-618 ◽  
Author(s):  
Gibeom Gu ◽  
Duksu Kim
Keyword(s):  
Volume Rendering ◽  
Unstructured Grid ◽  
Ray Casting ◽  
Grid Data ◽  
Ray Casting Algorithm

Multidimensional transfer functions for interactive volume rendering

2002 ◽  
Vol 8 (3) ◽  
pp. 270-285 ◽  
Author(s):  
J. Kniss ◽  
G. Kindlmann ◽  
C. Hansen
Keyword(s):  
Volume Rendering ◽  
Transfer Functions

General Adaptive Transfer Functions Design for Volume Rendering by Using Neural Networks

2006 ◽  
pp. 661-670 ◽  
Author(s):  
Liansheng Wang ◽  
Xucan Chen ◽  
Sikun Li ◽  
Xun Cai
Keyword(s):  
Neural Networks ◽  
Volume Rendering ◽  
Transfer Functions

Surface Reconstruction From Dexel Data for Virtual Sculpting

2004 ◽  
Author(s):  
Xiaobo Peng ◽  
Weihan Zhang ◽  
Sai-Gowthami Asam ◽  
Ming C. Leu
Keyword(s):  
Surface Reconstruction ◽  
Cross Sections ◽  
Geometric Modeling ◽  
Ray Casting ◽  
Virtual Sculpting ◽  
Shortest Distance ◽  
Branching Problem ◽  
Volume Ray Casting ◽  
Swept Volume ◽  
Differential Equation Method

This paper presents a new method for surface reconstruction from dexel data for virtual sculpting. We are in the midst of developing a dexel model based sculpting system having the capability of interactive solid modeling with haptics interface. The geometric modeling of our sculpting system is based on the Sweep Differential Equation method to compute the boundary of the tool swept volume. Ray casting is used to perform Boolean operations between the tool swept volume and the virtual stock in dexel models to simulate the sculpting process. The dexel data are converted to a series of planar contours in parallel slices (i.e. cross sections). The overlapping ratio between two contour areas is used as the criterion for deciding on the corresponding contours in two adjacent slices. The tiling problem is tackled by using the rule of the shortest distance between points on two corresponding contours. The branching problem is solved by adding one line segment between two contours to form one composite contour. Examples are given to demonstrate the ability of the developed code to convert from dexel data to triangular meshes for the viewing of a sculpted model in different directions.

Exploring parallelism in volume ray casting

2012 ◽  
Author(s):  
Guilherme Cox ◽  
Cleomar Silva ◽  
Leandro Cupertino ◽  
Cristiana Bentes ◽  
Ricardo Farias
Keyword(s):  
Ray Casting ◽  
Volume Ray Casting
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