mirror nurbsCurve in Maya

[Pacifique Nzitonda]

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

[benjamin ghys]

Hello,

Your last suggestion should perfectly work to mirror

[tomas mikulak]

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 <benjami...@gmail.com> napísal(a):

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[Marcus Ottosson]

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)

Key parts being the curve function, which is here and iterating over the controlPoints array attribute which you can do using cmds too.

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[Pacifique Nzitonda]

Cool, it works just fine. But if anyone has another way around it, please let me know. 

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[Pacifique Nzitonda]

Hi Marcus, I will test this. It looks really clean. Thanks in advance! 

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