spheres3d: add sphere set shape

Description

Adds a sphere set shape node to the scene

Usage

spheres3d(x, y = NULL, z = NULL, radius = 1, ...)
rgl.spheres(x, y = NULL, z = NULL, radius, ...)

Arguments

x, y, z

Numeric vector of point coordinates corresponding to the center of each sphere. Any reasonable way of defining the coordinates is acceptable. See the function xyz.coords for details.

radius

Vector or single value defining the sphere radius/radii

...

Material properties. See rgl.material for details.

Value

A shape ID of the spheres object is returned.

Details

If a non-isometric aspect ratio is chosen, these functions will still draw objects that appear to the viewer to be spheres. Use ellipse3d to draw shapes that are spherical in the data scale.

When the scale is not isometric, the radius is measured in an average scale. In this case the bounding box calculation is iterative, since rescaling the plot changes the shape of the spheres in user-coordinate, which changes the bounding box. Versions of rgl prior to 0.92.802 did not do this iterative adjustment.

If any coordinate or radius is NA, the sphere is not plotted.

If a texture is used, its bitmap is wrapped around the sphere, with the top edge at the maximum y coordinate, and the left-right edges joined at the maximum in the z coordinate, centred in x.

Examples

Run this code

# NOT RUN {
open3d()
spheres3d(rnorm(10), rnorm(10), rnorm(10), radius = runif(10), color = rainbow(10))
# }