Add VR multiple spheres from dataframe
add_vr_3d_points(my_html, into, df0, ...)html in a vector of strings; output from 'create_html'.
character string; unique identifier of a line in the html. Element id is highly recommended.
A dataframe containing x, y, z coordinates, radius r (optional) and color (optional). Note that the names of the columns are strict, i.e. must be 'x', 'y', 'z', 'r'(optional), 'color'(optional).
Extra parameter that goes into a tag, e.g. In <div type = "xxx">, 'type = "xxx"' goes to ... .