Calculates a color for each point on the surface using the surface normals and hemispherical UV mapping. This uses either a texture map provided by the user (as an RGB array), or a built-in color texture.
sphere_shade( heightmap, sunangle = 315, texture = "imhof1", normalvectors = NULL, colorintensity = 1, zscale = 1, progbar = interactive() )
A two-dimensional matrix, where each entry in the matrix is the elevation at that point. All points are assumed to be evenly spaced.
Default `315` (NW). The direction of the main highlight color (derived from the built-in palettes or the `create_texture` function).
Default `imhof1`. Either a square matrix indicating the spherical texture mapping, or a string indicating one of the built-in palettes (`imhof1`,`imhof2`,`imhof3`,`imhof4`,`desert`, `bw`, and `unicorn`).
Default `NULL`. Cache of the normal vectors (from `calculate_normal` function). Supply this to speed up texture mapping.
Default `1`. The intensity of the color mapping. Higher values will increase the intensity of the color mapping.
Default `1/colorintensity`. The ratio between the x and y spacing (which are assumed to be equal) and the z axis. Ignored unless `colorintensity` missing.
Default `TRUE` if interactive, `FALSE` otherwise. If `FALSE`, turns off progress bar.
RGB array of hillshaded texture mappings.
#Basic example: montereybay %>% sphere_shade() %>% plot_map() #Decrease the color intensity: montereybay %>% sphere_shade(colorintensity=0.1) %>% plot_map() #Change to a built-in color texture: montereybay %>% sphere_shade(texture="desert") %>% plot_map() #Change the highlight angle: montereybay %>% sphere_shade(texture="desert", sunangle = 45) %>% plot_map() #Create our own texture using the `create_texture` function: montereybay %>% sphere_shade(zscale=10,texture=create_texture("#E9C68D","#AF7F38", "#674F30","#494D30", "#B3BEA3")) %>% plot_map()