Hi all.
I am trying to determine the most efficient way to search for nodes
(transforms) of specified types (eg transform of a curve) under a hierarchy
(lets call it 'top_node') that have a specific custom (string) attribute.
When potentially dealing with a large number of nodes speed becomes a
factor.
I've approached this in a few ways (two if which are listed below), and I'd
appreciate opinions:
Approach1:
1) Create List1: nodes that have the required attribute via:
cmds.ls('*.customAttrName')
..not so fast (scene level search..) but somewhat convenient
2) Create List2: transforms of specific node type under the 'top_node' ..eg:
all transforms of curves under the top_node
3) intersect the 2 lists using : list(set(List1) & set(List2))
*top_node = 'M_worldMover_crv'*
*search_string = '*.gvAnim'*
*gvAnim_list = cmds.ls <http://cmds.ls>(search_string, r=1, o=1, l=1)*
*curves_list = cmds.listRelatives(cmds.ls <http://cmds.ls>(top_node, dag=1,
type='nurbsCurve',ni=1, o=1, r=1, l=1), p=1, f=1)*
*final_list = list(set(gvAnim_list) & set(curves_list))*
*cmds.select(final_list)*
Approach2:
I think this one is a bit faster but not greatly.
1) create List1: transforms of specific node type under the 'top_node' (eg
all transforms of meshes).
2) Create List2: iterate through List1 to see if the node contains the
custom attribute and append to the list.
*top_node = 'M_worldMover_crv'*
*search_attribute = '.gvAnim'*
*curves_list = cmds.listRelatives(cmds.ls <http://cmds.ls>(top_node, dag=1,
type='nurbsCurve',ni=1, o=1, r=1, l=1), p=1, f=1)*
*final_list = [i for i in curves_list if cmds.ls <http://cmds.ls>(i +
search_attribute )]*
*cmds.select(final_list)*
I guess my issue would be solved, mostly, if the command *ls* could take a
string argument for attribute,* while* using the 'dag' flag, and a node to
search under:
example:
*cmds.ls <http://cmds.ls>(top_node, dag=1, type='mesh') * # works to
search under a hierarchy
*cmds.ls <http://cmds.ls>('*.customAttr', o=1) * # works to find all
objects in scene with the specified attribute
but.. this obviously doesnt work, unless I'm missing something:
*cmds.ls <http://cmds.ls>(top_node, '*.customAttr', dag=1, o=1)* # but it's
sort of what I am trying to do..
Is the API faster? If so is there someone that could point me in the right
direction please?
Thanks for any help.
Gerard.
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