On 03/02/2015 9:43 AM, keith.jew...@campdenbri.co.uk wrote:
Dear all,

I am using writeWebGL to create an HTML page containing an interactive 3D plot. It works fine with 
the default prefix="" but fails when I specify a prefix "for different scenes 
displayed on the same web page" (quoting ?writeWebGL).  I'm sure I'm misreading the help, and 
would appreciate guidance.

Briefly, it works fine with the default writeWebGL( ,prefix="", ) and the 
template containing %WebGL%
I have not been able to make it work with any other value of prefix; e.g. writeWebGL( 
,prefix="A",) and the template containing %AWebGL%

Here is code illustrating the problem.

First create three templates:
a) Vanilla: copied system.file(file.path("WebGL", "template.html"), package="rgl") to 
file.path(getwd(), "template.html")

b) First attempt: ?writeWebGL says # "[the template] should contain a single line containing 
paste("%", prefix, "WebGL%"), e.g. %WebGL% with the default empty prefix"
paste("%", "A", "WebGL%")
# [1] "% A WebGL%"
so file.path(getwd(), "templateA.html") is a copy of (a) replacing %WebGL% with 
% A WebGL%

c) Second attempt: file.path(getwd(), "templateB.html") is  a copy of (a) 
replacing %WebGL% with %AWebGL%

then, in R
#-----------
library(rgl)
plot3d(1:5, 1:5, 1:5) # generate rgl scene
#-----------
# a) vanilla
writeWebGL(dir=getwd(), template = file.path(getwd(), "template.html"), 
prefix="")
# works OK; result opens and works in IE
#----------------
# b) First attempt, my reading of ?writeWebGL
writeWebGL(dir=getwd(), template = file.path(getwd(), "templateA.html"), 
prefix="A")
# Error in writeWebGL(dir = getwd(), template = file.path(getwd(), 
"templateA.html"),  :
#                       template ‘m://templateA.html’ does not contain %AWebGL%
# so it looks as if the help is trivially wrong, it should be paste0
paste0("%", "A", "WebGL%")

Yes, that's right.  I'll fix it.

# [1] "%AWebGL%"
#----------------
# c) second attempt using %AWebGL%
writeWebGL(dir=getwd(), template = file.path(getwd(), "templateB.html"), 
prefix="A")
# runs without error in R but IE displays "You must enable Javascript to view this 
page properly."
#--------------

I don't understand why (c) is different from (a).

There may be an error in the generated Javascript. In Firefox, you could ask to see the browser console log, and it would report if there was an error on the page; sometimes those make the Javascript fail, and it falls back to the error message you saw. I don't know how/if you can do that in IE.



Here are the system details:

R version 3.1.0 (2014-04-10)
Platform: i386-w64-mingw32/i386 (32-bit)

locale:
[1] LC_COLLATE=English_United Kingdom.1252
[2] LC_CTYPE=English_United Kingdom.1252
[3] LC_MONETARY=English_United Kingdom.1252
[4] LC_NUMERIC=C
[5] LC_TIME=English_United Kingdom.1252

attached base packages:
[1] grDevices datasets  splines   graphics  stats     tcltk     utils
  [8] tools     methods   base

other attached packages:
[1] knitr_1.8       animation_2.3   rgl_0.95.1158   CBRIutils_1.0

That's an old version of rgl; current on CRAN is 0.95.1201. <http://cran.r-project.org/src/contrib/rgl_0.95.1201.tar.gz> (CRAN OSX currently has an old binary; I don't recommend that you use it. I don't know why they haven't updated to the current one.) r-forge has even newer versions, but I'm in the middle of some changes there, so I don't recommend using that version right now.

Duncan Murdoch
<http://cran.r-project.org/src/contrib/rgl_0.95.1201.tar.gz>
  [5] stringr_0.6.2   svSocket_0.9-55 TinnR_1.0-5     R2HTML_2.3.1
  [9] Hmisc_3.12-2    Formula_1.1-1   survival_2.37-7

loaded via a namespace (and not attached):
[1] cluster_1.15.3  devtools_1.6.1  evaluate_0.5.5  formatR_1.0
[5] grid_3.1.0      highr_0.4       lattice_0.20-29 rpart_4.1-8
[9] svMisc_0.9-70

Internet Explorer 11 Version 11.0.9600.17420

Any advice is welcome.


Keith Jewell - Statistician
Tel: +44 (0)1386 842055
Web:  www.campdenbri.co.uk
Email:  keith.jew...@campdenbri.co.uk

Campden BRI (Chipping Campden) Limited - part of the Campden BRI group
Station Road ♦ Chipping Campden ♦ Gloucestershire ♦ GL55 6LD ♦ UK



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