Seems like an interesting challenge. :)
from maya import cmds
def find_joint(position, epsilon=0.01):
"""Find joint at `position` with precision `epsilon`
Arguments:
position (tuple): XYZ coordinates to look for a joint
epsilon (float, optional): Precision at which to consider it a match
"""
for joint in cmds.ls(type="joint"):
# Find worldspace position of joint, including parenthood
p = cmds.xform(
joint,
translation=True,
worldSpace=True,
query=True,
)
if all(abs(p[axis] - position[axis]) < epsilon for axis in range(3)):
return joint
# No joint was found at this position
return None
# For example..
positions = [
(10.0, 10.0, 10.0),
(50.0, 0.0, 0.0),
(0.0, 10.0, 0.0)
]
# Create joints at these positions..for p in positions:
joint = cmds.createNode("joint")
cmds.move(p[0], p[1], p[2], joint)
# And then retrieve them againfor p in positions:
joint = find_joint(p)
print("Found: %s @ %s" % (joint, str(p)))
# Test whether it fails when expectedassert not find_joint((999.0, 0,
0)), "There shouldn't have been a joint here!"
The trick being to (1) iterate over all joints, which isn’t free but also
not too costly in any scene with < 10,000 joints or so and queries being
made < 1 time/sec or so, and (2) compare their position with some
“precision”. The latter being important because we’re comparing
floating-point numbers, which cannot be trusted to exactly match with a float1
== float2 comparison. If you’re scene is very large, you would increase the
size of epsilon to e.g. 0.1 or even 1.0 if it’s really, really large. If
your scene is very small, then the opposite is true. 0.01 should hold up in
cases where joints are placed with a minimum of 0.02 cm (default Maya
units).
If joints are too close or epsilon is too large, only one of the
overlapping joints would be returned, in the order provided by cmd.ls.
Is there a faster way? Possibly by replacing maya.cmds with maya.api, but I
don’t think you can escape having to iterate over all joints like this
which is where time is likely spent (although do profile it to make sure!),
unless you do what Vincent suggests and store your joints up-front instead
of relying on their worldspace position in the scene.
Hope it helps
On Sun, 5 Jul 2020 at 15:26, vince touache <fruityfr...@gmail.com> wrote:
> if you created the joints yourself, by explicitely querying vertex n
> position and creating the joint on it, can't you generate a mapping list
> when you do it ? If it needs to be persistent, you could also tag your
> joint with the vertex ID
>
>
> Le dimanche 5 juillet 2020 10:23:53 UTC-4, василий руков a écrit :
>>
>> I have created alot joints perVertex, now i need select joints that on
>> specific edgeLoop,
>> i can find vertex position, but how with that information find joints at
>> this positions,
>> maybe it's simple, please help,
>>
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