multi_ivy.py

import bpy
import random
import mathutils
from math import radians,degrees
bpy.ops.object.select_pattern(pattern="IVY_Curve*",extend=False)
for obj in bpy.context.selected_objects:
    obj.select_set(state=True)
bpy.ops.object.delete()


bpy.context.scene.frame_current=1
object = bpy.data.objects["Source"]
object.select_set(state=True)
bpy.context.view_layer.objects.active=object


psys = bpy.context.object.particle_systems["Ivy"]
pset = bpy.data.particles["Ivy"]
psys.seed = random.randint(0,2**31)
bpy.context.scene.frame_current=1

def get_part(obj):
    degp = bpy.context.evaluated_depsgraph_get()
    return obj.evaluated_get(degp).particle_systems.active.particles


num_particles = len(get_part(object))
o_rot=mathutils.Euler(object.rotation_euler)
for i in range(num_particles):
    new_rot=(random.random()*360,random.random()*360,random.random()*360)
    object.rotation_euler=tuple(map(radians,new_rot))
    erot=mathutils.Euler(object.rotation_euler)
    bpy.context.scene.cursor.location=get_part(object)[i].location
    bpy.ops.curve.ivy_gen(updateIvy=True, defaultIvy=False)
    ivy=[obj for obj in bpy.context.scene.objects if obj.name.startswith("IVY_Curve")][-1]
    ivy.parent=object
    ivy.matrix_parent_inverse = object.matrix_world.inverted()
object.rotation_euler=o_rot


bpy.context.scene.cursor.location=(0,0,0)
object.rotation_euler=o_rot
bpy.ops.object.select_pattern(pattern="IVY_Curve*",extend=False)

first_frame=bpy.context.scene.frame_start
last_frame=bpy.context.scene.frame_end

min_step=bpy.data.scenes["Scene"].render.fps*3

for i,obj in enumerate(bpy.context.selected_objects):
    start=random.random()*max(0,(last_frame-first_frame)-min_step)
    end=start+min_step+random.random()*max(0,(last_frame-start)-min_step)
    print(obj,start,end)
    obj.animation_data_clear()
    obj.user_clear()

    obj.data.animation_data_clear()
    obj.data.user_clear()

    obj.data.bevel_factor_end=0.0
    obj.data.keyframe_insert(data_path="bevel_factor_end",frame=start)
    obj.data.bevel_factor_end=1.0
    obj.data.keyframe_insert(data_path="bevel_factor_end",frame=end)

bpy.context.scene.frame_current=last_frame

bpy.ops.object.select_pattern(pattern="",extend=False)