Extract pixel information from window
This function extracts single components of the pixel information from the topmost window.
rgl.pixels(component = c("red", "green", "blue"),
viewport = par3d("viewport"), top = TRUE)component |
Which component(s)? |
viewport |
Lower left corner and size of desired region. |
top |
Whether to bring window to top before reading. |
The possible components are "red", "green", "blue",
"alpha", "depth", and "luminance" (the sum of the three
colors). All are scaled from 0 to 1.
Note that the luminance is kept below 1 by truncating the sum; this is the
definition used for the GL_LUMINANCE component in OpenGL.
A vector, matrix or array containing the desired components. If one component is requested, a vector or matrix will be returned depending on the size of block requested (length 1 dimensions are dropped); if more, an array, whose last dimension is the list of components.
Duncan Murdoch
rgl.snapshot to write a copy to a file,
demo("stereo") for functions that make use of this to draw
a random dot stereogram and an anaglyph.
example(surface3d)
depth <- rgl.pixels(component = "depth")
if (length(depth) && is.matrix(depth)) # Protect against empty or single pixel windows
contour(depth)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.