import bpy
# Set these to False if you don't want to key that property.
KEYFRAME_LOCATION = True
KEYFRAME_ROTATION = True
KEYFRAME_SCALE = True
KEYFRAME_VISIBILITY = False # Viewport and render visibility.
KEYFRAME_VISIBILITY_SCALE = True
def create_objects_for_particles(ps, obj):
# Duplicate the given object for every particle and return the duplicates.
# Use instances instead of full copies.
obj_list = []
mesh = obj.data
particles_coll = bpy.data.collections.new(name="particles")
bpy.context.scene.collection.children.link(particles_coll)
for i, _ in enumerate(ps.particles):
dupli = bpy.data.objects.new(
name="particle.{:03d}".format(i),
object_data=mesh)
particles_coll.objects.link(dupli)
obj_list.append(dupli)
return obj_list
def match_and_keyframe_objects(ps, obj_list, start_frame, end_frame):
# Match and keyframe the objects to the particles for every frame in the
# given range.
for frame in range(start_frame, end_frame + 1):
print("frame {} processed".format(frame))
bpy.context.scene.frame_set(frame)
for p, obj in zip(ps.particles, obj_list):
match_object_to_particle(p, obj)
keyframe_obj(obj)
def match_object_to_particle(p, obj):
# Match the location, rotation, scale and visibility of the object to
# the particle.
loc = p.location
rot = p.rotation
size = p.size
if p.alive_state == 'ALIVE':
vis = True
else:
vis = False
obj.location = loc
# Set rotation mode to quaternion to match particle rotation.
obj.rotation_mode = 'QUATERNION'
obj.rotation_quaternion = rot
if KEYFRAME_VISIBILITY_SCALE:
if vis:
obj.scale = (size, size, size)
if not vis:
obj.scale = (0.001, 0.001, 0.001)
obj.hide_viewport = not(vis) # <<<-- this was called "hide" in <= 2.79
obj.hide_render = not(vis)
def keyframe_obj(obj):
# Keyframe location, rotation, scale and visibility if specified.
if KEYFRAME_LOCATION:
obj.keyframe_insert("location")
if KEYFRAME_ROTATION:
obj.keyframe_insert("rotation_quaternion")
if KEYFRAME_SCALE:
obj.keyframe_insert("scale")
if KEYFRAME_VISIBILITY:
obj.keyframe_insert("hide_viewport") # <<<-- this was called "hide" in <= 2.79
obj.keyframe_insert("hide_render")
def add_copy_rotation_constraint(obj):
# Add Copy Rotation constraint to the object.
copy_rotation_constraint = obj.constraints.new(type='COPY_ROTATION')
# Set the target to the original animated object (assuming it's the active object).
copy_rotation_constraint.target = bpy.context.selected_objects[0]
copy_rotation_constraint.owner_space = 'LOCAL'
def main():
#in 2.8 you need to evaluate the Dependency graph in order to get data from animation, modifiers, etc
depsgraph = bpy.context.evaluated_depsgraph_get()
# Assume only 2 objects are selected.
# The active object should be the one with the particle system.
ps_obj = bpy.context.object
ps_obj_evaluated = depsgraph.objects[ ps_obj.name ]
obj = [obj for obj in bpy.context.selected_objects if obj != ps_obj][0]
for psy in ps_obj_evaluated.particle_systems:
ps = psy # Assume only 1 particle system is present.
start_frame = bpy.context.scene.frame_start
end_frame = bpy.context.scene.frame_end
obj_list = create_objects_for_particles(ps, obj)
match_and_keyframe_objects(ps, obj_list, start_frame, end_frame)
for generated_obj in obj_list:
add_copy_rotation_constraint(generated_obj)
if __name__ == '__main__':
main()