[R] persp3D: Adjusting labels other than centered?

[Helmut Schütz]

Dear all,

for a publication I have to change cex.axis and cex.lab. I'm already 
using Paul Murrell's workaround to increase the distance of the axes' 
titles by adding "\n". However, I found no method to either increase the 
distance of the labels or set their justification (by adj or hadj). They 
are centered (adj 0.5), which may lead to overlapping. Example:

x <- seq(-10, 10, length = 100)
y <- x
f <- function(x,y) { r <- sqrt(x^2+y^2); 0.1*sin(r)/r }
z <- outer(x, y, f)
library(plot3D)
persp3D(x = x, y = y, z = z, ticktype = "detailed",
         colkey = FALSE, cex.lab = 2, cex.axis = 1.5,
         xlab = "\nmy x", ylab = "\nmy y", zlab = "\n\nmy z")

?persp mentions hadj only for the colkey-argument
?perspbox tells me that other arguments can be passed to persp
There I find that additional parameters might be set in par. However, 
adj seems to be valid only for text, mtext and title (not for labels in 
axis).

Now I'm stuck. Is there a method to(1) pass an argument to adjust text 
and (2) if yes, can it be set independently for the three axes?
In my example centered for x and y is fine, but for z I would liketo 
have the labels right-justified.
I was thinking about writing the labels by text3D (and format them by 
sprintf), but then I'm facing another collision. In order to prevent the 
default-labels to be displayed I have to switch to ticktype="simple". 
Then I (1) loose the ticks and (2) get the arrows which I don't want.

THX in advance,
Helmut

Environment: x86_64-w64-mingw32/x64 (64-bit), R 3.2.2, plot3D 1.0-2

-- 
Ing. Helmut Schütz
BEBAC - Consultancy Services for
Bioequivalence and Bioavailability Studies
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