calculate_normal {rayshader}

Calculate Normal

Description

Calculates the normal unit vector for every point on the grid.

Usage

calculate_normal(heightmap, zscale = 1, progbar = FALSE)

Arguments

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.

Value

Matrix of light intensities at each point.

Examples

#Here we produce a light intensity map of the `volcano` elevation map.

#Cache the normal vectors of the volcano dataset
if(run_documentation()) {
volcanocache = calculate_normal(volcano)
}

#Use the cached vectors to speed up calculation of `sphere_shade()` on a map.
if(run_documentation()) {
sphere_shade(volcano,normalvectors = volcanocache) %>%
 plot_map()
}