Question about contour3d and writeWebGL: rgl and misc3d package
On 12-11-16 7:09 PM, John Muschelli wrote:
The contour its just half a brain and the vertices are not surfaces and are filled in
Sounds like a bug in the browser. When I try it in Firefox 16.0.2 it
doesn't display properly; the error log (found via Tools | Web developer
| Error console has several errors in it, the first of which is:
Error: array initialiser too large
That's clearly a limitation of the browser. You might be able to work
around it by plotting one layer at a time; writeWebGL will write each
rgl object in separate arrays of data. If the layers are separate, the
browser might be able to handle them. I just tried this, and it works
on my system, using this code:
contour3d(a, 1:64, 1:64, 1.5*(1:21), lev=c(3000),
alpha = c(0.2), color = c("white"))
contour3d(a, 1:64, 1:64, 1.5*(1:21), lev=c(8000),
alpha = c(0.5), color = c("red"), add=TRUE)
contour3d(a, 1:64, 1:64, 1.5*(1:21), lev=c(10000),
alpha = c(1), color = c("green"), add=TRUE)
followed by the browseURL call you already had.
Duncan Murdoch
This was sent from a mobile phone so please excuse any misspellings or
typos.
On Nov 16, 2012 6:55 PM, "Duncan Murdoch" <murdoch.duncan at gmail.com
<mailto:murdoch.duncan at gmail.com>> wrote:
On 12-11-16 5:59 PM, John Muschelli wrote:
I saw that in rgl:::writeWebGL that "Polygons will only be
rendered as
filled; there is no support in WebGL for wireframe or point
rendering.". I
found that you can easily use contour3d to make reproducible
contour web
figures, such as (taken from contour3d help)
library(AnalyzeFMRI)
a <- f.read.analyze.volume(system.__file("example.img", package=
"AnalyzeFMRI"))
a <- a[,,,1]
contour3d(a, 1:64, 1:64, 1.5*(1:21), lev=c(3000),
alpha = c(0.2), color = c("white"))
browseURL(paste("file://", writeWebGL(dir=file.path(__tempdir(),
"webGL"),
width=500), sep=""))
But I found problems with multiple levels, such as
contour3d(a, 1:64, 1:64, 1.5*(1:21), lev=c(3000, 8000, 10000),
alpha = c(0.2, 0.5, 1), color = c("white", "red",
"green"))
browseURL(paste("file://", writeWebGL(dir=file.path(__tempdir(),
"webGL"),
width=500), sep=""))
Does anyone know why this happens, or a way to fix it (maybe
using separate
= TRUE for contour3d)?
Why what happens?
Duncan Murdoch