R: Calculate Normal

calculate_normal {rayshader} | R Documentation

## 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
    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()

[Package rayshader version 0.19.2 Index]