> <\body> \; A point set is a collection of points usually stored as a sequence of coordinates.\ <\with|par-mode|center> |pointset_walnut.axl> Point sets are non-structured data, easy to visualize, more and more commonly avalaible via 3D scanners. To each point, a color information or a normal vector can be also attached. Here is an example of a t set, where each pixel point \[-2,2]> is colored according to the number of iterations\ <\equation*> z\ z+a+i b which stay in the disc |\|>\2>, starting from . <\with|par-mode|center> Here is another example of the Newton iteration set, where each pixel point \[-2,2]> is colored according to which root of -1=0>, the Newton iteration <\math> <\equation*> z\ z - \ -1|3 z> converges to, starting from \a+i b >. <\with|par-mode|center> The file format used in to store point sets is the following. <\cpp-code> \pointset size="nbpts" \ x0 y0 z0 \ x1 y1 z1 ... \/pointset\ The size > is the number of points which are stored. The blue parts are optional; > are integers between 0 and 255 describing the color. <\initial> <\collection>