Generation of Accurate Integral Surfaces in Time-Dependent Vector Fields

Garth, Christoph; Krishnan, Harinarayan; Tricoche, Xavier; Bobach, Tom; Joy, Kenneth I.

doi:10.1109/tvcg.2008.133

Cited by 66 publications

(49 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…More recently, Garth et al [10] replaced the advancing front paradigm by an incremental time line approximation scheme, allowing them to keep particle integration localized in time. They applied this algorithm to compute stream surfaces and path surfaces in large and time-varying CFD datasets.…”

Section: Integral Surface Generationmentioning

confidence: 99%

IRIS: Illustrative Rendering for Integral Surfaces

Hummel

Garth

Hamann

et al. 2010

IEEE Trans. Visual. Comput. Graphics

View full text Add to dashboard Cite

Fig. 1. A path surface generated from a turbulent jet dataset, rendered in two different styles using the framework proposed in this paper. In the left image, the surface is opaque, and the front and back side are rendered with yellow and blue, respectively. An adaptive stripe pattern visualizes individual pathlines on the surface and provides the orientation of the flow. On the right, the surface is rendered transparently with a denser stripes to give a hatching-like appearance. Both figures emphasize surface silhouettes for better distinction of individual surface layers.Abstract-Integral surfaces are ideal tools to illustrate vector fields and fluid flow structures. However, these surfaces can be visually complex and exhibit difficult geometric properties, owing to strong stretching, shearing and folding of the flow from which they are derived. Many techniques for non-photorealistic rendering have been presented previously. It is, however, unclear how these techniques can be applied to integral surfaces. In this paper, we examine how transparency and texturing techniques can be used with integral surfaces to convey both shape and directional information. We present a rendering pipeline that combines these techniques aimed at faithfully and accurately representing integral surfaces while improving visualization insight. The presented pipeline is implemented directly on the GPU, providing real-time interaction for all rendering modes, and does not require expensive preprocessing of integral surfaces after computation.

show abstract

Section: Integral Surface Generationmentioning

confidence: 99%

IRIS: Illustrative Rendering for Integral Surfaces

Hummel

Garth

Hamann

et al. 2010

IEEE Trans. Visual. Comput. Graphics

View full text Add to dashboard Cite

show abstract

“…By moving from time-based integral curve integration to arc length-based integration and incorporating front refinement criteria based on curvature, better resolution control is achieved, and complex flow patterns can be adequately resolved. In a later paper, these authors described an algorithm that translates these results to time-varying flow [9].…”

Section: Stream Surface Definition and Computationmentioning

confidence: 99%

“…Garth et al [9], Hummel et al [13], and Born et al [2] recently investigated advanced rendering techniques including nonphotorealistic rendering and better texture mapping to achieve improved visual depictions of stream surfaces (cf. Figure 3).…”

Section: Stream Surface Definition and Computationmentioning

confidence: 99%

Parallel stream surface computation for large data sets

Camp

Childs

Garth

et al. 2012

IEEE Symposium on Large Data Analysis and Visualization (LDAV)

Self Cite

View full text Add to dashboard Cite

Figure 1: Stream surfaces generated during this study. On the left, flow around an ellipsoid. In the middle, flow in a tokamak. On the right, flow from a thermal hydraulics simulation. ABSTRACTParallel stream surface calculation, while highly related to other particle advection-based techniques such as streamlines, has its own unique characteristics that merit independent study. Specifically, stream surfaces require new integral curves to be added continuously during execution to ensure surface quality and accuracy; performance can be improved by specifically accounting for these additional particles. We present an algorithm for generating stream surfaces in a distributed-memory parallel setting. The algorithm incorporates multiple schemes for parallelizing particle advection and we study which schemes work best. Further, we explore speculative calculation and how it can improve overall performance. In total, this study informs the efficient calculation of stream surfaces in parallel for large data sets, based on existing integral curve functionality.

show abstract

“…Lastly, we incorporate integral surfaces. Garth et al [7] have described a generic hardware-accelerated approach for generating pathsurfaces, while Bürger et al [3] presented a real-time technique for the generation of streak surfaces. Recently, Born et al [2] and Hummel et al [10] introduced distinct illustrative visualization styles for integral surfaces.…”

Section: Related Workmentioning

confidence: 99%

“…Implementation: A range of approaches for integral-surface generation were presented in the literature. Garth et al [7] presented an accurate generation of integral surfaces in unsteady flow fields, and focus on an adaptively-refined propagation of the surface front. They observe the separation between pathline and timeline generation, as depicted in figure 7d.…”

Section: Integral Surfacesmentioning

confidence: 99%

Interactive Virtual Probing of 4D MRI Blood-Flow

Pelt

Bescós

Breeuwer

et al. 2011

IEEE Trans. Visual. Comput. Graphics

View full text Add to dashboard Cite

Fig. 1. Interactive virtual probe with flow visualization approaches, enabling exploration of cardiovascular 4D MRI blood-flow data. Color in the leftmost rendition encodes the blood-flow vorticity, while color in other renditions conveys the local blood-flow speed.Abstract-Better understanding of hemodynamics conceivably leads to improved diagnosis and prognosis of cardiovascular diseases. Therefore, an elaborate analysis of the blood-flow in heart and thoracic arteries is essential. Contemporary MRI techniques enable acquisition of quantitative time-resolved flow information, resulting in 4D velocity fields that capture the blood-flow behavior. Visual exploration of these fields provides comprehensive insight into the unsteady blood-flow behavior, and precedes a quantitative analysis of additional blood-flow parameters. The complete inspection requires accurate segmentation of anatomical structures, encompassing a time-consuming and hard-to-automate process, especially for malformed morphologies. We present a way to avoid the laborious segmentation process in case of qualitative inspection, by introducing an interactive virtual probe. This probe is positioned semi-automatically within the blood-flow field, and serves as a navigational object for visual exploration. The difficult task of determining position and orientation along the view-direction is automated by a fitting approach, aligning the probe with the orientations of the velocity field. The aligned probe provides an interactive seeding basis for various flow visualization approaches. We demonstrate illustration-inspired particles, integral lines and integral surfaces, conveying distinct characteristics of the unsteady blood-flow. Lastly, we present the results of an evaluation with domain experts, valuing the practical use of our probe and flow visualization techniques.

show abstract

Generation of Accurate Integral Surfaces in Time-Dependent Vector Fields

Cited by 66 publications

References 14 publications

IRIS: Illustrative Rendering for Integral Surfaces

IRIS: Illustrative Rendering for Integral Surfaces

Parallel stream surface computation for large data sets

Interactive Virtual Probing of 4D MRI Blood-Flow

Contact Info

Product

Resources

About