R Graphical Manual

Browse All

Last data update: 2014.03.03

R: Create a Set of Tetrahetra Centered at Data Points

pointsTetrahedra

R Documentation

Create a Set of Tetrahetra Centered at Data Points

Description

Creates a scene consisting of small tetrahedra centered at specified data points in three dimensions.

Usage

pointsTetrahedra(x, y, z, size = 0.01, color = "black", ...)

Arguments

`x, y, z`	numeric vectors representing point coordinates.
`size`	numeric; multiple of data range to use for the size of the tetrahedron in each dimension; recycled to length 3.
`color`	color to use for the tetrahedra.
`...`	additional arguments to be passed on to `makeTriangles`.

Details

This function is useful, for example, for incorporating raw data along with a density estimate surface in a scene rendered using standard or grid graphics. For rgl rendering points3d is an alternative.

Value

Returns a triangle mesh scene representing the tetrahedra.

Examples

  with(quakes, {
      d <- kde3d(long, lat, -depth, n = 40)
      v <- contour3d(d$d, exp(-12),d$x/22, d$y/28, d$z/640,
                     color="green", color2="gray", draw=FALSE)
      p <- pointsTetrahedra(long/22, lat/28, -depth/640,
                            size = 0.005)
      drawScene(list(v, p))
  })