[R] rgl::writeWebGL( , prefix = , )

[Keith.Jewell at campdenbri.co.uk]

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%")
# [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).

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
 [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.jewell at 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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