render_contours: Render Contours

In rayshader: Create Maps and Visualize Data in 2D and 3D

Render Contours

Description

Adds 3D contours to the current scene, using the heightmap of the 3D surface.

Usage

render_contours(
  heightmap = NULL,
  zscale = 1,
  levels = NA,
  nlevels = NA,
  linewidth = 3,
  color = "black",
  palette = NULL,
  antialias = FALSE,
  offset = 0,
  clear_previous = FALSE
)

Arguments

heightmap	A two-dimensional matrix, where each entry in the matrix is the elevation at that point. All grid points are assumed to be evenly spaced.
zscale	Default '1'. The ratio between the x and y spacing (which are assumed to be equal) and the z axis. For example, if the elevation levels are in units of 1 meter and the grid values are separated by 10 meters, 'zscale' would be 10.
levels	Default 'NA'. Automatically generated with 10 levels. This argument specifies the exact height levels of each contour.
nlevels	Default 'NA'. Controls the auto-generation of levels. If levels is length-2, this will automatically generate 'nlevels' breaks between 'levels[1]' and 'levels[2]'.
linewidth	Default '3'. The line width.
color	Default 'black'. Color of the line.
palette	Default 'NULL'. Overrides 'color'. Either a function that returns a color palette of 'n' colors, or a character vector with colors that specifies each color manually.
antialias	Default 'FALSE'. If 'TRUE', the line with be have anti-aliasing applied. NOTE: anti-aliasing can cause some unpredictable behavior with transparent surfaces.
offset	Default '5'. Offset of the track from the surface, if 'altitude = NULL'.
clear_previous	Default 'FALSE'. If 'TRUE', it will clear all existing paths.

Examples

#Add contours to the montereybay dataset
if(run_documentation()) {
montereybay %>%
 height_shade() %>%
 add_shadow(ray_shade(montereybay,zscale=50),0.3) %>%
 plot_3d(montereybay, theta = -45, zscale=50)
render_contours(montereybay, zscale = 50, offset = 100)
render_snapshot()
}

if(run_documentation()) {
#Specify the number of levels
render_contours(montereybay, zscale = 50, offset = 100, nlevels = 30,
               clear_previous = TRUE)
render_snapshot()
}

if(run_documentation()) {
#Manually specify the breaks with levels
render_contours(montereybay, linewidth = 2,  offset = 100, zscale = 50,
               levels = seq(-2000, 0, 100), clear_previous = TRUE)
render_snapshot()
}

if(run_documentation()) {
#Use a color palette for the contours 
volcano |> 
 constant_shade() |> 
 plot_3d(volcano, zscale = 2, solid = FALSE, zoom = 0.8)
palette = grDevices::colorRampPalette(c("red", "purple", "pink"))
render_contours(volcano, offset = 1, palette = palette, zscale = 2, nlevels = 20)
render_snapshot()
}

if(run_documentation()) {
#Render using `render_highquality()` for a neon light effect
render_highquality(light = FALSE, 
                  line_radius = 0.1, sample_method="sobol_blue",
                  path_material = rayrender::light, ground_size = 0,
                  path_material_args = list(importance_sample = FALSE,
                                            color = "purple", intensity = 2))
}

rayshader documentation built on May 29, 2024, 3:03 a.m.