haha I wanted to make sure there was no "smart" trick before going down the
bruteforce road !
As soon as you start iterating on all joints / all vertices, it might
quickly becomes too heavy to be usable. An "easy" way to speed up while not
using the api would be to try.... cmdx? ^__^
If it is, indeed, meant to be used on "production" assets with a regular
resolution, it could be interesting to consider using a data structure,
like a kd-tree, to split the 3d space
Le dimanche 5 juillet 2020 12:08:41 UTC-4, Marcus Ottosson a écrit :
>
> 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 <fruit...@gmail.com
> <javascript:>> 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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