what's the workflow for both cases can anyone enlighten me plz .

Hey papon,

bounding object: you can plug an object, for example, a torus into the second input of the node. all points inside the object get assigned to the group.
bounding volume: does the same but you plug in a volume.

Cheers
CYTE

CYTE
Hey papon,

bounding object: you can plug an object, for example, a torus into the second input of the node. all points inside the object get assigned to the group.
bounding volume: does the same but you plug in a volume.

Cheers
CYTE

okay,agree with you but is there any workflow for using different choices ?.

-thanks4Reply.

papon
okay,agree with you but is there any workflow for using different choices ?.

ultimately it's up to you
if simple axis aligned box or ellipsoid is enough, use one of the first 2
for more complex watertight shape use object (geometry) or sdf volume, usage of those may depend on the shape and whether it is animated or not
for static or rigid animated shapes, transforming Bounding Volume may be faster
for deforming animated shapes, Bounding Object may be faster, but it really depends on the complexity of the geometry so you may need to profile it for your case to decide the most