This function adds a reference grid to an RGL plot.
Where to put the grid; see the Details section.
How to draw the grid; see the Details section.
The color of the grid lines.
The line width of the grid lines. (Currently only
The line type of the grid lines.
Suggested number of grid lines; see the Details section.
This function is similar to
grid in classic graphics,
except that it draws a 3D grid in the plot.
The grid is drawn in a plane perpendicular to the coordinate axes. The
first letter of the
side argument specifies the direction of
"z" (or uppercase
versions) to specify the coordinate which is constant on the plane.
at = NULL (the default), the grid is drawn at the limit of
the box around the data. If the second letter of the
"-" or is not present, it is the lower limit; if
then at the upper limit. The grid lines are drawn at values
n suggested locations.
The default locations should match those chosen by
nticks = n.
at is a numeric vector, the grid lines are drawn at those values.
at is a list, then the
"x" component is used to
specify the x location, the
"y" component specifies the y location, and
"z" component specifies the z location. Missing components
are handled using the default as for
at = NULL.
Multiple grids may be drawn by specifying multiple values for
or for the component of
at that specifies the grid location.
A vector or matrix of object ids is returned invisibly.
If the scene is resized, the grid will not be resized; use
to draw grid lines that will automatically resize.
Ben Bolker and Duncan Murdoch
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