CIBC:Documentation:SCIRun:Reference:Teem:TendEvq
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TendEvq
Information
- Package: Teem
- Catagory: Tend
- Author(s): Darby Van Uitert
- Status: Supported in latest version
- Version: 3.0
Description
Summary
Quantize directions of diffusion. Because VTK doesn't do multi-dimensional colormaps, we have to quantize directions of diffusion (usually just the principal eigenvector) in order to create the usual XYZ-RGB coloring. Because eigenvector directions are poorly defined in regions of low anisotropy, the length of the vector (pre-quantization) is modulated by anisotropy, requiring the selection of some anisotropy metric.
Detailed Description
Quantize directions of diffusion. Because VTK doesn't do multi-dimensional colormaps, we have to quantize directions of diffusion (usually just the principal eigenvector) in order to create the usual XYZ-RGB coloring. Because eigenvector directions are poorly defined in regions of low anisotropy, the length of the vector (pre-quantization) is modulated by anisotropy, requiring the selection of some anisotropy metric.
Evec Index : Which eigenvector should be quantized: a value of 0 for the direction of fastest diffusion (eigenvector associated with largest eigenvalue), values 1 or 2 for other two eigenvectors (associated with middle and smallest eigenvalue) (integer).
Anisotropy Metric: Which anisotropy metric to plot. All the Westin metrics come in two versions. Currently supported: cl1, cl2: Westin's linear; cp1, cp2: Westin's planar; ca1, ca2: Westin's linear + planar; cs1, cs2: Westin's spherical (1-ca); ct1, ct2: GK's anisotropy type (cp/ca); ra: Basser/Pierpaoli relative anisotropy; fa: Basser/Pierpaoli fractional anisotropy/sqrt(2); vf: volume fraction = 1-(Basser/Pierpaoli volume ratio); tr: trace.
Don't Attenuate the color by Anisotropy : When not selected, regions with low or no anisotropy are very dark colors or black.
Frequently Asked Questions
Known Bugs
Recent Changes
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