Otherwise it will only produce an approximate Gaussian distribution. This option is useful if you want to Fourier transform the map later. The command AVER0 will cause WHAT IF to add a constant to every grid point in such a way that the average map value will become zero. The command INV50 will mirror all points above 50 to a point equally fart away from 50 but below 50. This option only makes sense if your map ranges from 0.0 - 100.0.
Convex points are grid points that form a sharp external protrusion in the map.
They have more empty than filled points around them. In practice they are defined as points in the shell with three or more orthogonal neighbors that have the value zero. It will in every cycle determine all points that have three or more neighbors equal to zero, butt less than three neighbors that have the value 100, and put these points to zero if they were between 1 and 99. In principle this boils down to removing the convex points from the outside of the shell, and from the inside of large cavities. This option only works well on WHAT IF generated maps, or maps scaled such that the values fall in the -115 till 115 range.