With this function you can retrieve the y position in the room of a group of particles. The group value is that which was returned when you created the group of particles using the function physics_particle_group_end, and the function will return a value which is the combined value of the currently set flags.
|group||The particle group to get.|
xx = physics_particle_group_get_x(group1);
yy = physics_particle_group_get_y(group1);
The above code will get the x and y positions of the particle group indexed in the variable "group1" and store them in variables.