How to refresh hair particle position with python?

Archive Python API
1

in blender, the position of the hair particle can be inaccurate when there’s modifiers influencing some particles vgroups, and when there’s texture slots influencing the density and length. (bug?)

within my addon i use this function to refresh the position of the particles constantly (basically toggle the hidding button twice is working fine)


def refresh_particles_show_hide():
    C_Slots = bpy.context.scene.C_Slots_settings
    Terrain = C_Slots.Terrain_pointer

    if Terrain:
        for m in Terrain.modifiers:
            if m.name[:7] == 'SCATTER':
                m.show_viewport = not m.show_viewport #inverse
                m.show_viewport = not m.show_viewport #inverse
                break

is there a better updating method that can also refresh the particle position ? so far i tried a lot of things and it never work out

dg = bpy.context.evaluated_depsgraph_get()
dg.update()

is not working

there’s also

particle_system.settings.update_tag()

but doesn’t seem to work either
resetting the frame position is not working too.

i’m kind of stuck here, because the hide trick is a bit slow on constant use

2

I think if the particle position isn’t updating automatically, there’s a bug.

1 Like
3

yeah i think is (an oversight, a dev forgot to send an refresh when X forgotter action is done), but in the meanwhile working with heavy particles in blender is difficult :frowning: