Parameters size Specifies the diameter of rasterized points.
The default is 1.0. Description glPointSize specifies the rasterized diameter of both aliased and antialiased points. Using a point size other than 1.0 has different effects, depending on whether point antialiasing is enabled. If point antialiasing is disabled, the actual size is determined by rounding the supplied size to the nearest integer. All pixel fragments produced in rasterizing a nonantialiased point are assigned the same associated data, that of the vertex corresponding to the point.