Select particles based on 3D noise map

[RossOleary]

Hey all.

I have a grid of particles i have created with 'birth voxels'. Ideally i'd like to use a 3D noise or something to select nice areas or patches of this grid that I could then delete or modify.

Any thoughts? Am i thinking about this all wrong perhaps?

[d4rk3lf]

I think I never tried 3D map with particles, but with quick try, I think it works perfectly.
Check the max file in attachment.