Points

divide points into 3 equal parts:

i@part = floor(fit(rand(@ptnum+.258), 0, 1, 0, 2.9));

Nage replacement

@nage = fit(@age,0,@life,0,1);

Group from class:

string grpname = sprintf("class_%d", i@class);
setprimgroup(0, grpname, @primnum, 1); // use setpointgroup() if running over points

Connect close points:

float max_dist = chf("connect_distance");

int npts = @numpt;
for (int i = 0; i < npts; i++) {
    vector pi = point(0, "P", i);
    for (int j = i+1; j < npts; j++) {
        vector pj = point(0, "P", j);
        if (distance(pi, pj) < max_dist) {
            int prim = addprim(0, "polyline");
            addvertex(0, prim, i);
            addvertex(0, prim, j);
            setprimattrib(0, "create_frame", prim, @Frame);
         
        } 
    }
}

Shift

0 -1 to 0 - 1  - 0:

float mask = f@mask;

// Find the midpoint (assuming mask ranges from 0 to 1)
float midpoint = 0.5;

// Convert to a centered value: 0.5 becomes 1, 0 and 1 become 0
float result = 1.0 - abs(mask - midpoint) * 2.0;
result = clamp(result, 0.0, 1.0);

// Optionally, remap to custom range or sharpen
f@newmask = result;