The hardware and bandwidth for this mirror is donated by dogado GmbH, the Webhosting and Full Service-Cloud Provider. Check out our Wordpress Tutorial.
If you wish to report a bug, or if you are interested in having us mirror your free-software or open-source project, please feel free to contact us at mirror[@]dogado.de.

Heightmaps

library(grid)
library(isocubes)

A heightmap is a matrix of locations - the values in the matrix coorespond to the height at heach location.

calc_heightmap_coords() calculates coordinates for all the cubes to represent this terrain. These coordinates can then be rendered as isocubes using isocubesGrob().

#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# Prepare a matrix of values
# each matrix value is the terrain height at that location
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
mat <- datasets::volcano
mat <- mat - min(mat)

#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# Create a data.frame of coordinates for every isocube in this terrain
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
coords <- calc_heightmap_coords(mat, scale = 0.3)

#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# Convert the coordinates into a isocubesGrob
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cubes  <- isocubesGrob(coords, size = 1.5, x = 0.65, y = 0)
grid.newpage(); grid.draw(cubes)

Add color to each location

#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# create matrix of colours - same dimensions as matrix
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
val <- as.vector(mat)
val <- round(255 * (val - min(val)) / diff(range(val)))
fill <- terrain.colors(256)[val + 1L]
dim(fill) <- dim(mat) 


#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# Convert the coordinates into a grob
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
coords <- calc_heightmap_coords(mat, fill = fill, scale = 0.3)
cubes  <- isocubesGrob(coords, size = 1.5, x = 0.65, y = 0)
grid.newpage(); grid.draw(cubes)

These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.
Health stats visible at Monitor.