dsmpixel

int  dsmpixel(string map, string channel, int x, int y, <type>&values[])

Each pixel of a deep shadow map channel has multiple values. This function will extract the list of the values associated with the channel for the given pixel.

Returns the number of values in the deep pixel (or -1 on failure).

A DSM will always have Pz and Of channels. The Pz channel stores the z-depth associated with each record. The Of channel stores the opacity.