Fast display of illuminated field lines

Stalling, Detlev; Zöckler, Malte; Hege, Hans Christian

doi:10.1109/2945.597795

Cited by 61 publications

(35 citation statements)

References 20 publications

(15 reference statements)

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“…Streamlines can be illuminated using a Phong illumination model and replacing the missing surface normals with planes of possible normals which are orthogonal to the streamline. The technique can be implemented efficiently in hardware by precomputing a texture which encodes the illumination obtained for different view points, light directions and tangents of the streamline [6]. An alternative way to illuminate streamlines is to create streamtubes by fitting a thin Gouraud shaded cylinder around them.…”

Section: Methodsmentioning

confidence: 99%

DTI volume rendering techniques for visualising the brain anatomy

Wünsche

Linden

Holmberg

2005

International Congress Series

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Over the past few years Diffusion Tensor Imaging (DTI) has become an increasingly popular method for imaging the brain anatomy and diagnosing a variety of neurodegenerative diseases. Unfortunately the size and multi-dimensional nature of diffusion tensor data sets makes it difficult to understand them. We use illuminated streamlines to compute high quality dense 3D visualisations of the 3D nerve fibre structure. Nerve fibres are extracted using a numerical integration technique and a fuzzy classifier which represents the probability that a sample point represents grey matter, white matter or Cerebral Spinal Fluid (CSF). We present two novel methods which improve the perception of the 3D arrangements of fibre tracts. The first method is a hardware accelerated algorithm which represents fibres as semi-transparent tubes with emphasised silhouettes. Because of the semi-transparent nature of the tubes inside structures are revealed. The enhancement of tube silhouettes improves the identification of individual fibre tracts and their 3D arrangement. The second method uses direct volume rendering and multiple colour and transparency look-up tables to represent the directional information of the nerve fibre structure and other tissue types simultaneously. The method can be used to represent finer details depending on the resolution of the noise texture employed. Depending on the choice of the opacity transfer functions fibre tracts can be represented semi-transparent or nearly opaque.

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Section: Methodsmentioning

confidence: 99%

DTI volume rendering techniques for visualising the brain anatomy

Wünsche

Linden

Holmberg

2005

International Congress Series

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“…While the illuminated field lines technique [13] can help determine the shading of a field line, it is less effective to accurately interpret the spatial relationships between similarly oriented adjacent or overlapping lines, as pointed out in [1]. In particular, thin lines could look artificial because the texture does not vary sideways across the width of the lines.…”

Section: Illuminationmentioning

confidence: 99%

Advanced Visualization Technology for Terascale Particle Accelerator Simulations

Schussman²,

Wilson³

et al. 2002

ACM/IEEE SC 2002 Conference (SC'02)

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This paper presents two new hardware-assisted rendering techniques developed for interactive visualization of the terascale data generated from numerical modeling of nextgeneration accelerator designs. The first technique, based on a hybrid rendering approach, makes possible interactive exploration of large-scale particle data from particle beam dynamics modeling. The second technique, based on a compact texture-enhanced representation, exploits the advanced features of commodity graphics cards to achieve perceptually effective visualization of the very dense and complex electromagnetic fields produced from the modeling of reflection and transmission properties of open structures in an accelerator design. Because of the collaborative nature of the overall accelerator modeling project, the visualization technology developed is for both desktop and remote visualization settings. We have tested the techniques using both timevarying particle data sets containing up to one billion particles per time step and electromagnetic field data sets with millions of mesh elements.

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“…Their idea consists in introducing an additional control parameter in the standard Blinn-Phong shading model that allows for a smooth transition between shading models associated with line and surface objects respectively. In that way regions of linear anisotropy are shaded like illuminated streamlines [112] and regions of planar anisotropy are shaded like surfaces, while intermediate anisotropy types are shaded according to a combination of these two extrema. Moreover this method can be combined with a shading based on the gradient of an opacity function alone, which ensures a consistent shading across a feature of interest.…”

Section: Volume Renderingmentioning

confidence: 99%