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Draw small 3D spheres at given points.
highlight.points.spheres(coords, color = "#FF0000", radius = 1)
double vector or nx3 double matrix, the xyz point coordinates.
the sphere color, like '#FF0000' or "red".
'#FF0000'
"red"
double, the sphere radius
Other 3d utility functions: highlight.vertices.spheres(), vertex.coords()
highlight.vertices.spheres()
vertex.coords()