[R] rgl zooming to an arbitrary location
Gareth Davies
grothered at gmail.com
Mon Sep 1 05:12:27 CEST 2014
I have been using rgl to view xyz point clouds containing topographic
data ( with around 10^5 - 10^6 points).
It's working well aside from one thing: I would like to be able to zoom
into an arbitrary part of the plot. However so far I could only figure
out how to zoom into the centre.
See the example below -- in this case, I cannot 'zoom-in' to anything
other than the central hill in the topography, whereas I would like to
be able to zoom to an arbitrary location.
Is there a way to get around this?
##########################################
# EXAMPLE CODE
##########################################
library(rgl)
# Make up some topography
x=runif(1e+06, min=0,max=1000)
y=runif(1e+06, min=0,max=1000)
# Elevation with 'hill' in the centre
z=sin(x/50.)+cos(y/50.) + 30*exp(-((x-500)^2+(y-500)^2)*0.001)
plot3d(x,y,z,col=z+3,aspect=FALSE)
# Now try zooming [right mouse button]. I can only zoom into the central
hill, not elsewhere.
Below are the details of my R Install
> sessionInfo()
R version 3.1.1 (2014-07-10)
Platform: x86_64-unknown-linux-gnu (64-bit)
locale:
[1] LC_CTYPE=en_AU.UTF-8 LC_NUMERIC=C
[3] LC_TIME=en_AU.UTF-8 LC_COLLATE=en_AU.UTF-8
[5] LC_MONETARY=en_AU.UTF-8 LC_MESSAGES=en_AU.UTF-8
[7] LC_PAPER=en_AU.UTF-8 LC_NAME=C
[9] LC_ADDRESS=C LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_AU.UTF-8 LC_IDENTIFICATION=C
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] rgl_0.93.1098 unstructInterp_0.0-1 rgeos_0.3-6
[4] rgdal_0.8-16 sp_1.0-15 geometry_0.3-4
[7] magic_1.5-6 abind_1.4-0 SearchTrees_0.5.2
[10] roxygen2_4.0.1
loaded via a namespace (and not attached):
[1] digest_0.6.4 grid_3.1.1 lattice_0.20-29 Rcpp_0.11.2
[5] stringr_0.6.2 tools_3.1.1
>
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