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

Duncan Murdoch murdoch.duncan at gmail.com
Tue Feb 3 16:14:35 CET 2015 

On 03/02/2015 9:43 AM, Keith.Jewell at 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.jewell at campdenBRI.co.uk
>
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