This function uses a bitmap of a standard 2D graphics plot as a texture on a quadrilateral. Default arguments are set up so that it will appear on the face of the bounding box of the current 3D plot, but optional arguments allow it to be placed anywhere in the scene.
show2d(expression,
face = "z-", line = 0,
reverse = FALSE, rotate = 0,
x = NULL, y = NULL, z = NULL,
width = 480, height = 480,
filename = NULL,
ignoreExtent = TRUE,
color = "white", specular = "black", lit = FALSE,
texmipmap = TRUE, texminfilter = "linear.mipmap.linear",
expand = 1.03,
texcoords = matrix(c(0, 1, 1, 0, 0, 0, 1, 1), ncol = 2), ...)Invisibly returns the id value of the quadrilateral, with the following attributes:
The value returned by expression.
A 4 by 3 matrix giving the coordinates of the corners as used in plotting.
A 4 by 2 matrix giving the texture coordinates of the image.
The filename for the temporary file holding the bitmap image.
Any plotting commands to produce a plot in standard graphics.
Ignored if filename is not NULL.
A character string defining which face of the bounding box to use. See Details below.
How far out from the bounding box should the quadrilateral
be placed? Uses same convention as mtext3d:
not lines of text, but fraction of the bounding box size.
Should the image be reversed or rotated? See Details below.
Specific values to use to override face.
Parameters to pass to png when creating the
bitmap. See Details below.
A .png file image to use as the texture.
Whether the quadrilateral should be ignored when computing the bounding box of the scene.
Material properties to use for the quadrilateral.
Amount by which the quadrilateral is expanded outside the bounding box of the data.
Coordinates on the image. Lower left
of the bitmap is c(0,0), upper right is c(1,1).
Duncan Murdoch
The default arguments are chosen to make it easy to place
a 2D image on the face of the bounding box. If x,
y and z are NULL (the defaults),
face will be used as a code for one of the
six faces of the bounding box. The first letter should
be "x", "y" or "z"; this defines
the axis perpendicular to the desired face. If the
second letter is "-" or is missing, the face
will be chosen to be the face with the lower value
on that axis. Any other letter will use the opposite
face.
If any of x, y or z is given, the
specified value will be used to replace the value calculated
above. Usually four values should be given, corresponding to
the coordinates of the lower left, lower right, upper right
and upper left of the destination for the image before
reverse and rotate are used. Fewer values
can be used for one or two coordinates; cbind
will be used to put together all 3 coordinates into
a 4 by 3 matrix (which will be returned as an attribute
of the result).
The bitmap plot will by default be oriented so that it is
properly oriented when viewed from the
direction of the higher values of the perpendicular coordinate,
and its lower left corner is at the lower value of the two
remaining coordinates. The argument reverse causes
the orientation to be mirrored, and rotate causes it
to be rotated by multiples of 90 degrees. rotate should be an integer,
with 0 for no rotation, 1 for a 90 degree
counter-clockwise rotation, etc.
The width and height arguments control the shape
and resolution of the bitmap. The defaults give a square
bitmap, which is appropriate with the usual c(1,1,1)
aspect ratios (see aspect3d). Some tuning may be
needed to choose the resolution. The plot will look best when
displayed at its original size; shrinking it smaller tends to make
it look faded, while expanding it bigger will make it look
blurry. If filename is given, the width and height
will be taken from the file, and width and height
arguments will be ignored.
bgplot3d uses a plot as the background for the window.
example(plot3d, ask = FALSE)
show2d({
par(mar=c(0,0,0,0))
plot(x, y, col = rainbow(1000), axes=FALSE)
})
Run the code above in your browser using DataLab