Usage
## S3 method for class 'dtiData':
show3d(obj,nx=NULL,ny=NULL,nz=NULL,center=NULL,scale=.5,bgcolor="black",add=FALSE,maxobjects=729,what="ADC",minalpha=1,power=1,nn=1,normalize=FALSE,box=FALSE,title=FALSE,\dots)
## S3 method for class 'dtiTensor':
show3d(obj,nx=NULL,ny=NULL,nz=NULL,center=NULL,method=1,level=0,scale=.5,bgcolor="black",add=FALSE,subdivide=2,maxobjects=729,what="ADC",minalpha=.25,normalize=NULL,box=FALSE,title=FALSE,\dots)
## S3 method for class 'dtiIndices':
show3d(obj, index="FA", nx=NULL, ny=NULL, nz=NULL, center=NULL, method=1, level=0, bgcolor="black", add=FALSE, lwd=1,box=FALSE,title=FALSE, \dots)
## S3 method for class 'dwiQball':
show3d(obj,nx=NULL,ny=NULL,nz=NULL,center=NULL,scale=0.5,bgcolor="black",add=FALSE,subdivide=3,maxobjects=729,minalpha=1,power=1,normalize=TRUE,box=FALSE,title=FALSE, \dots)
Arguments
obj
An object of class dtiTensor or dtiIndices
nx
Number of voxel in x-direction
ny
Number of voxel in y-direction
center
Vector of length 3 specifying the center of the data cube (class dtiData or dtiTensor) or center of display (class dtiIndices)
scale
Scale factor for the size of polyeders dtiData and ellipsoids (dtiTensor)
bgcolor
Backgroundcolor for rgl-display
add
If true information is added to the current device, otherwise a new device is opened.
maxobjects
Maximal size of data cube (in voxel) to display
minalpha
Minimum value for transparency.
power
Exponent in visualization, defaults to 1. heighter values may be used for increased contrast.
nn
Number of nearest neighbors used for interpolation onto a regular polyeder.
normalize
If TRUE normalize values (project to interval (0,1) within each voxel). For tensor objects normalize=NULL specifies a default depending on the content of argument what (normalize <- switch(tolower(what),"tensor"=FALSE,"adc"
box
Logical, add a bounding box.
title
Either a character string specifying a title or a logical. If title==TRUE a default title characterizing the type of plot is generated.
method
method==1 and method==2 specify two different color schemes for directional FA-maps.
level
Minimal FA value of tensors.
subdivide
Level of subdivisions for meshing, level 0:4 correspond to use of
c(12,42,162,642,2562) vertices per tensor, respectively.
what
For dtiTensor-objects either "tensor" for visualization using ellipsoids or "ADC" for Apparent Diffusion Coefficients. For dtiData-objects choices are either "data" or "ADC".
lwd
Linewidth for visualization of dtiIndices objects.
index
Eiter "FA" for fractional anisotropy index or
"GA" for geodesic anisotropy index.
...
Additional parameters passed to function rgl.par from the rgl-package.