rgl (version 0.67-2)

rgl.surface: add height-field surface shape

Description

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.

Usage

rgl.surface(x, z, y, coords=1:3, ...)

Arguments

x

values corresponding to rows of y

y

matrix of height values

z

values corresponding to columns of y

coords

See details

...

Material and texture properties. See rgl.material for details.

Details

Adds a surface mesh to the current scene. The surface is defined by the matrix of height values in y, with rows corresponding to the values in x and columns corresponding to the values in z. The coords parameter can be used to change the geometric interpretation of x, y, and z. The first entry of coords indicates which coordinate (1=X, 2=Y, 3=Z) corresponds to the x parameter. Similarly the second entry corresponds to the y parameter, and the third entry to the z parameter. In this way surfaces may be defined over any coordinate plane. rgl.surface always draws the surface with the `front' upwards (i.e. towards higher y values). This can be used to render the top and bottom differently; see rgl.material and the example below.

See Also

rgl.material, surface3d, terrain3d

Examples

#
# volcano example taken from "persp"
#

data(volcano)

y <- 2 * volcano        # Exaggerate the relief

x <- 10 * (1:nrow(y))   # 10 meter spacing (S to N)
z <- 10 * (1:ncol(y))   # 10 meter spacing (E to W)

ylim <- range(y)
ylen <- ylim[2] - ylim[1] + 1

colorlut <- terrain.colors(ylen) # height color lookup table

col <- colorlut[ y-ylim[1]+1 ] # assign colors to heights for each point

rgl.clear()
rgl.surface(x, z, y, color=col, back="lines")

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