cloud and
wireframe displays.
panel.cloud(x, y, subscripts, z, groups = NULL, perspective = TRUE, distance = if (perspective) 0.2 else 0, xlim, ylim, zlim, panel.3d.cloud = "panel.3dscatter", panel.3d.wireframe = "panel.3dwire", screen = list(z = 40, x = -60), R.mat = diag(4), aspect = c(1, 1), par.box = NULL, xlab, ylab, zlab, xlab.default, ylab.default, zlab.default, scales.3d, proportion = 0.6, wireframe = FALSE, scpos, ..., at, identifier = "cloud")
panel.wireframe(...)
panel.3dscatter(x, y, z, rot.mat, distance, groups, type = "p", xlim, ylim, zlim, xlim.scaled, ylim.scaled, zlim.scaled, zero.scaled, col, col.point, col.line, lty, lwd, cex, pch, cross, ..., .scale = FALSE, subscripts, identifier = "3dscatter")
panel.3dwire(x, y, z, rot.mat = diag(4), distance, shade = FALSE, shade.colors.palette = trellis.par.get("shade.colors")$palette, light.source = c(0, 0, 1000), xlim, ylim, zlim, xlim.scaled, ylim.scaled, zlim.scaled, col = if (shade) "transparent" else "black", lty = 1, lwd = 1, alpha, col.groups = superpose.polygon$col, polynum = 100, ..., .scale = FALSE, drape = FALSE, at, col.regions = regions$col, alpha.regions = regions$alpha, identifier = "3dwire")panel.cloud these are essentially the same as the data passed
to the high level plot (except if formula was a matrix, the
appropriate x and y vectors are generated). By the
time they are passed to panel.3dscatter and
panel.3dwire, they have been appropriately subsetted (using
subscripts) and scaled (to lie inside a bounding box, usually
the [-0.5, 0.5] cube). Further, for panel.3dwire, x and y are shorter
than z and represent the sorted locations defining a
rectangular grid. Also in this case, z may be a matrix if the
display is grouped, with each column representing one surface.
In panel.cloud (called from wireframe) and
panel.3dwire, x, y and z could also be
matrices (of the same dimension) when they represent a 3-D surface
parametrized on a 2-D grid.
x, y
and z values (representing the whole data) are passed to
panel.cloud for each panel. subscripts specifies the
subset of rows to be used for the particular panel.
FALSE is equivalent to setting distance to 0
1 / distance. This is described in a
little more detail in the documentation for cloud
"x", "y" or "z" (repetitions are allowed), with
their values indicating the amount of rotation about that axis in
degrees.
screen rotates the view further.
box.3d.
cloud and
wireframe. This function is called after the ‘back’ of
the bounding box is drawn, but before the ‘front’ is drawn. Any user-defined custom display would probably want to change these
functions. The intention is to pass as much information to this
function as might be useful (not all of which are used by the
defaults). In particular, these functions can expect arguments
called xlim, ylim, zlim which give the bounding
box ranges in the original data scale and xlim.scaled,
ylim.scaled, zlim.scaled which give the bounding box
ranges in the transformed scale. More arguments can be considered on
request.
cloud cloud
directly.
panel.cloud to see the details of this enumeration.)
levelplot. This is ignored if shade=TRUE.
drape = TRUE in
wireframe. at can be a numeric vector,
col.regions a vector of colors, and alpha.regions a
numeric scalar controlling transparency. The resulting behaviour is
similar to levelplot, at giving the breakpoints
along the z-axis where colors change, and the other two determining
the colors of the facets that fall in between.
screen and R.mat
arguments to panel.cloud
"p", "l", "h" or "b". "p"
and "l" mean ‘points’ and ‘lines’ respectively,
and "b" means ‘both’. "h" stands for
‘histogram’, and causes a line to be drawn from each point to
the X-Y plane (i.e., the plane representing z = 0), or the
lower (or upper) bounding box face, whichever is closer.
type = "h"
TRUE if pch = "+".
panel.3dscatter can represent each point by a 3d
‘cross’ of sorts (it's much easier to understand looking at
an example than from a description). This is different from the
usual pch argument, and reflects the depth of the points and
the orientation of the axes. This argument indicates whether this
feature will be used. This is useful for two reasons. It can be set to FALSE to use
"+" as the plotting character in the regular sense. It can
also be used to force this feature in grouped displays.
All three numbers should be between 0 and 1. The
shade.colors.palette function should return a valid
color. The default function is obtained from the trellis settings.
polynum at a
time. Drawing too few at a time increases the total number of calls
to the underlying grid.polygon function, which affects
speed. Trying to draw too many at once may be unnecessarily memory
intensive. This argument controls the trade-off.
lex for
line width) may also be passed through the ... argument.
x, y, and z
should be assumed to be in the original data scale and hence scaled
before being plotted. x, y, and z are usually
already scaled. However, setting .scale=TRUE may be helpful
for calls to panel.3dscatter and panel.3dwire in
user-supplied panel functions.
cloud and wireframe.
panel.wireframe is a wrapper to panel.cloud, which does
the actual work. panel.cloud is responsible for drawing the content that does
not depend on the data, namely, the bounding box, the arrows/scales,
etc. At some point, depending on whether wireframe is TRUE, it
calls either panel.3d.wireframe or panel.3d.cloud, which
draws the data-driven part of the plot.
The arguments accepted by these two functions are different, since
they have essentially different purposes. For cloud, the data is
unstructured, and x, y and z are all passed to
the panel.3d.cloud function. For wireframe, on the other hand,
x and y are increasing vectors with unique values,
defining a rectangular grid. z must be a matrix with
length(x) * length(y) rows, and as many columns as the number
of groups.
panel.3dscatter is the default panel.3d.cloud function.
It has a type argument similar to panel.xyplot,
and supports grouped displays. It tries to honour depth ordering,
i.e., points and lines closer to the camera are drawn later,
overplotting more distant ones. (Of course there is no absolute
ordering for line segments, so an ad hoc ordering is used. There is no
hidden point removal.)
panel.3dwire is the default panel.3d.wireframe
function. It calculates polygons corresponding to the facets one by
one, but waits till it has collected information about polynum
facets, and draws them all at once. This avoids the overhead of
drawing grid.polygon repeatedly, speeding up the rendering
considerably. If shade = TRUE, these attempt to color the
surface as being illuminated from a light source at
light.source. palette.shade is a simple function that
provides the deafult shading colors
Multiple surfaces are drawn if groups is non-null in the call
to wireframe, however, the algorithm is not sophisticated
enough to render intersecting surfaces correctly.
cloud, utilities.3d