The ASCII input should contain blocks of information, where each block consists of a number indicating how many vertices will be contained in the polyline and then a series of XYZ points and color indices, with one for each vertex. The format of the input ASCII file is illustrated below :
number of vertices in first connected polyline X value Y value Z value color index X value Y value Z value color index X value Y value Z value color index . . . . . . . . . . . . X value Y value Z value color index number of vertices in second connected polyline X value Y value Z value color index . . . . . . . . . . . .
A single connected polyline primitive will be created for each successive block of information. A color will be stored for each vertex in the line. The color is determined from the provided vis colormap; the ASCII color indicies are used to index into the vis colormap.