Is there an efficient way to remove millions of particles that are inside some geometry?

Trying a group node to select points with a bounding object but it is running single thread, which is very slow on 80 million particles. Thanks!

Hey!
Use a bounding vdb volume, it does not have to be high resolution, it is much faster.

A billizion times faster! thanks buki!

instead of using the group bounding use this in a wrangle you will get some more boost

convert the shape to vdb like daniel said and connect it to the second input of wrangle

and

float in = volumesample(1,0,@P);
if(in < 0)
removepoint(geoself(),@ptnum);

Cool stuff tricecold! Interestingly both techniques are approx the same speed here on MacOs.