s2tessel.zorder: 3D Shell Grid Tessellation

In gdimap: Generalized Diffusion Magnetic Resonance Imaging

Description

3D shell grid tessellation of the icosahedron by Delaunay triangulation. Point are sorted in ZZ to enable hemi-sphere sampling.

Usage

s2tessel.zorder(depth=3, viewgrid=FALSE, saveg=FALSE)

Arguments

depth	sampling density on the hemisphere used in simulation (default N=321; depth=3).
viewgrid	logical variable controlling shell grid visualization (default: FALSE).
saveg	logical variable controlling grid data storage (default: FALSE).

Details

Sampling densities of N=81 (depth=2) and N=321 (depth=3) on the hemisphere are often used in ODF profile reconstruction from raw diffusion acquisitions.

Author(s)

Adelino Ferreira da Silva, Universidade Nova de Lisboa, Faculdade de Ciencias e Tecnologia, Portugal, afs at fct.unl.pt

References

Adler, D., and Murdoch, D. rgl: 3D visualization device system (OpenGL), 2012. R package version 0.92.880.

Barber, C. B., Habel, K., Grasman, R., Gramacy, R. B., Stahel, A., and Sterratt, D. C. geometry: Mesh generation and surface tessellation, 2012. R package version 0.3-2.

See Also

gqi.odfvmflines, rgbvolmap, gqi.odfpeaks, gqi.odfpeaklines, gqi.odfvxgrid, plotglyph, simulglyph.vmf, simul.fandtasia, simul.simplefield

Examples

## Not run: 
  s2tessel.zorder(depth=2, viewgrid=TRUE) # 162 shell points
  s2tessel.zorder(depth=3, viewgrid=TRUE) # 642 shell points

## End(Not run)

gdimap documentation built on May 2, 2019, 8:52 a.m.