On 03/02/2015 12:18 PM, David Winsemius wrote:
On Feb 3, 2015, at 7:14 AM, Duncan Murdoch wrote:
> 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.)
I'm not sure why either, but that newer package does fail compilation on both
trunks of the Mac platform. I have version 1098 on my OSX 10.7.5 box (and I'm
pretty sure that's the one on my Yosemite-equiped laptop. I just tried
compiling from source on the Lion platform with the source at CRAN and it fails
there, too. (Sometimes I am able to get packages to compile that report errors
on CRAN.)
The first error reported from efforts at installing both 1201 and 1208 versions
is:
checking for X... libraries , headers
checking for glEnd in -lGL... no
configure: error: missing required library GL
That looks as though it's not finding the OpenGL libraries. I think the
usual way to get them on a Mac is to install XQuartz. rgl doesn't have
to use X11, but it will (e.g. if you run it from RStudio), and it
requires the X11 files for compiling. I haven't experimented a lot with
systems that don't have XQuartz installed, but I just saw one yesterday
where even the native OpenGL code (what you get when you run rgl within
R.app) wouldn't start; after installing XQuartz, it was fixed.
Duncan Murdoch
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