I think OP specifically asked for a way that did *not* involve duplicating
and scaling.
The Maya API has some options, in a nutshell:
1. Read points on original curve
2. Negate their x coordinate
3. Generate a new curve using the negated points
import cmdx
# Read original points
original = cmdx.selection()[0]
original_points = [p.read() for p in original["controlPoints"]]
# Negate an axis
negated_points = [(p[0], p[1], p[2] * -1) for p in original_points]
# Make new curve
parent = cmdx.createNode("transform", name="negated")
curve = cmdx.curve(parent, points=negated_points)
[image: image.png]
Key parts being the curve function, which is here
<https://github.com/mottosso/cmdx/blob/814c7d934b13ba8735736424b69d0b89639157fa/cmdx.py#L7231>
and iterating over the controlPoints array attribute which you can do using
cmds too.
On Mon, 26 Sept 2022 at 08:27, tomas mikulak <[email protected]> wrote:
> Hi, you can use mine,
> select good shape curve then not shaped and run script. it will mirror
> shape to another curve.
>
> ne 25. 9. 2022 o 23:19 benjamin ghys <[email protected]>
> napísal(a):
>
>>
>> Hello,
>>
>> Your last suggestion should perfectly work to mirror
>> On Sunday, September 25, 2022 at 9:17:06 PM UTC+2 [email protected]
>> wrote:
>>
>>> Hi every body,
>>> Can someone tell me how to mirror from +X to -X a nurbsCurve inside Maya
>>> using cmds or pymel ?
>>> I do not want to do the manual way of duplicating the curve, grouping
>>> it, fliping the group's x scale and freeze transform. I'm looking for a
>>> mathematical approach.
>>>
>>> One way I was thinking doing this is to get nurbsCurve's points and for
>>> each point multiply its X value by -1 and then reconstruct a new
>>> nurbsCurve using the new values.
>>> I'm not sure if it's an effective solution.
>>>
>>> Thanks
>>>
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