surface3d.Rd
Adds a surface to the current scene. The surface is defined by a matrix defining the height of each grid point and two vectors defining the grid.
surface3d(x, y, z, ..., normal_x = NULL, normal_y = NULL, normal_z = NULL)
terrain3d(x, y, z, ..., normal_x = NULL, normal_y = NULL, normal_z = NULL)
values corresponding to rows of z
, or matrix of x coordinates
values corresponding to the columns of z
, or matrix of y coordinates
matrix of heights
Material and texture properties. See rgl.material
for details.
matrices of the same dimension as z
giving the coordinates of normals at
each grid point
Adds a surface mesh to the current scene. The surface is defined by
the matrix of height values in z
, with rows corresponding
to the values in x
and columns corresponding to the values in
y
. This is the same parametrization as used in persp
.
If the x
or y
argument is a matrix, then it must be of the same
dimension as z
, and the values in the matrix will be used for the corresponding
coordinates. This is used to plot shapes such as cylinders
where z is not a function of x and y.
If the normals are not supplied, they will be calculated automatically based on neighbouring points.
surface3d
always draws the surface with the `front' upwards
(i.e. towards higher z
values). This can be used to render
the top and bottom differently; see rgl.material
and
the example below.
For more flexibility in defining the surface, use rgl.surface
.
surface3d
and terrain3d
are synonyms.
rgl.material
, rgl.surface
.
See persp3d
for a higher level interface.
#
# volcano example taken from "persp"
#
z <- 2 * volcano # Exaggerate the relief
x <- 10 * (1:nrow(z)) # 10 meter spacing (S to N)
y <- 10 * (1:ncol(z)) # 10 meter spacing (E to W)
zlim <- range(z)
zlen <- zlim[2] - zlim[1] + 1
colorlut <- terrain.colors(zlen) # height color lookup table
col <- colorlut[ z - zlim[1] + 1 ] # assign colors to heights for each point
open3d()
surface3d(x, y, z, color = col, back = "lines")