snapshot3d: Export screenshot

Description

Saves the screenshot to a file.

Usage

rgl.snapshot( filename, fmt = "png", top = TRUE )
snapshot3d( filename = tempfile(fileext = ".png"), 
            fmt = "png", top = TRUE,
            ..., scene, width = NULL, height = NULL,
            webshot = as.logical(Sys.getenv("RGL_USE_WEBSHOT", "TRUE")) )

Value

These functions are mainly called for the side effects. The filename of the saved file is returned invisibly.

Arguments

filename: path to file to save.
fmt: image export format, currently supported: png. Ignored if webshot = TRUE.
top: whether to call rgl.bringtotop. Ignored if webshot = TRUE.
...: arguments to pass to webshot2::webshot
scene: an optional result of scene3d or rglwidget to plot
width, height: optional specifications of output size in pixels
webshot: Use the webshot2 package to take the snapshot

Details

rgl.snapshot() is a low-level function that copies the current RGL window from the screen. Users should usually use snapshot3d() instead; it is more flexible, and (if webshot2 is installed) can take images even if no window is showing, and they can be larger than the physical screen. On some systems webshot2 doesn't work reliably; if you find snapshot3d() failing or taking a very long time I'd recommend using snapshot3d(..., webshot = FALSE). See the note below about RGL_USE_WEBSHOT to make this the default.

Animations can be created in a loop modifying the scene and saving each screenshot to a file. Various graphics programs (e.g. ImageMagick) can put these together into a single animation. (See movie3d or the example below.)

Examples

Run this code

if (interactive() && !in_pkgdown_example()) {
  saveopts <- options(rgl.useNULL = TRUE)
  plot3d(matrix(rnorm(300), ncol = 3, dimnames = list(NULL, c("x", "y", "z"))), 
         col = "red")
  options(saveopts)
  browseURL(snapshot3d())
}

if (FALSE) {

#
# create animation
#

shade3d(oh3d(), color = "red")
rgl.bringtotop()
view3d(0, 20)

olddir <- setwd(tempdir())
for (i in 1:45) {
  view3d(i, 20)
  filename <- paste("pic", formatC(i, digits = 1, flag = "0"), ".png", sep = "")
  snapshot3d(filename)
}
## Now run ImageMagick in tempdir().  Use 'convert' instead of 'magick'
## if you have an older version of ImageMagick:
##    magick -delay 10 *.png -loop 0 pic.gif
setwd(olddir)
}

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