View source: R/render_clouds.R
cloud_shade | R Documentation |
Render shadows from the 3D floating cloud layer on the ground. Use this function to add shadows to the map with the 'add_shadow()' function.
For realistic results, argument should match those passed to 'render_clouds()'. The exception to this is 'attenuation_coef', which can be used to adjust the darkness of the resulting shadows.
cloud_shade(
heightmap,
start_altitude = 1000,
end_altitude = 2000,
sun_altitude = 90,
sun_angle = 315,
time = 0,
cloud_cover = 0.5,
layers = 10,
offset_x = 0,
offset_y = 0,
scale_x = 1,
scale_y = 1,
scale_z = 1,
frequency = 0.005,
fractal_levels = 16,
attenuation_coef = 1,
seed = 1,
zscale = 1
)
heightmap |
A two-dimensional matrix, where each entry in the matrix is the elevation at that point. This is used by 'render_clouds()' to calculate the regions the clouds should be rendered in. |
start_altitude |
Default '1000'. The bottom of the cloud layer. |
end_altitude |
Default '2000'. The top of the cloud layer. |
sun_altitude |
Default '10'. The angle, in degrees (as measured from the horizon) from which the light originates. |
sun_angle |
Default '315' (NW). The angle, in degrees, around the matrix from which the light originates. Zero degrees is North, increasing clockwise |
time |
Default '0'. Advance this to make the clouds evolve and change in shape. |
cloud_cover |
Default '0.5'. The percentage of cloud cover. |
layers |
Default '90'. The number of layers to render the cloud layer. |
offset_x |
Default '0'. Change this to move the cloud layer sideways. |
offset_y |
Default '0'. Change this to move the cloud layer backwards and forward |
scale_x |
Default '1'. Scale the fractal pattern in the x direction. |
scale_y |
Default '1'. Scale the fractal pattern in the y direction. |
scale_z |
Default '1'. Scale the fractal pattern in the z (altitude) direction. (automatically calculated). Scale the fractal pattern in the z (vertical) direction. s. |
frequency |
Default '0.005'. The base frequency of the noise used to calculate the fractal cloud structure. |
fractal_levels |
Default '16'. The fractal dimension used to calculate the noise. Higher values give more fine structure, but take longer to calculate. |
attenuation_coef |
Default '1'. Amount of attenuation in the cloud (higher numbers give darker shadows). This value is automatically scaled to account for increasing the number of layers. |
seed |
Default '1'. Random seed used to generate clouds. |
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. |
A 2D shadow matrix.
if(run_documentation()) {
#Render clouds with cloud shadows on the ground
montereybay %>%
sphere_shade() %>%
add_shadow(cloud_shade(montereybay,zscale=50), 0.0) %>%
plot_3d(montereybay,background="darkred",zscale=50)
render_camera(theta=-65, phi = 25, zoom = 0.45, fov = 80)
render_clouds(montereybay, zscale=50)
render_snapshot()
}
if(run_documentation()) {
#Adjust the light direction for shadows and increase the attenuation for darker clouds
montereybay %>%
sphere_shade() %>%
add_shadow(cloud_shade(montereybay,zscale=50, sun_altitude=20, attenuation_coef = 3), 0.0) %>%
plot_3d(montereybay,background="darkred",zscale=50)
render_camera(theta=-65, phi = 25, zoom = 0.45, fov = 80)
render_clouds(montereybay, zscale=50)
render_snapshot()
}
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.