Calculate Normal
Calculates the normal unit vector for every point on the grid.
calculate_normal(heightmap, zscale = 1, progbar = FALSE)
heightmap |
A two-dimensional matrix, where each entry in the matrix is the elevation at that point. All points are assumed to be evenly spaced. |
zscale |
Default 1. |
progbar |
Default 'FALSE'. If 'TRUE', turns on progress bar. |
Matrix of light intensities at each point.
#Here we produce a light intensity map of the `volcano` elevation map. #Cache the normal vectors of the volcano dataset volcanocache = calculate_normal(volcano) #Use the cached vectors to speed up calculation of `sphere_shade()` on a map. sphere_shade(volcano,normalvectors = volcanocache) %>% plot_map()
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