Remove a given % of points randomly

[anicg]

I attach a file where need to remove randomly a percentage of the points say for example 15%, whether using vex or not. I know I can reduce the number in the scatter, but that happens before further processing on the points, I'd like to keep the the point positions but just remove some of them.

 

 

remove_randomly_pct_points_.hiplc

Edited April 14, 2022 by anicg

[Sepu]

if(rand(@ptnum + 213.23) < chf("thresh")){
    removepoint(0, @ptnum);
}

 or use the lab tool "random_selection"

[ikoon]

If you need exact number of random points, you could use Sort SOP (Point Sort: Random) and then Blast the right amount of points:

 

This code removes approximate percentage:

float thr  = 0.15;
float rand = rand(@ptnum + 0.654);

if ( rand < thr)
{
    removepoint(0, @ptnum);
}