MFnNurbsSurface Crash

Rémi Deletrain

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Sep 9, 2015, 4:24:37 AM9/9/15

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Hello everyone,

I am trying to retrieve a position of a uv nurbssurface from a point in space.

For this I use the Maya API.

I tried with a mesh and it works very well. The problem I have with the nurbssurface is that when I run my script Maya plant ...

Is someone already had this problem?

That's the code:

------------------------------------------------------------------------------------------------

shape = 'nurbsSphereShape1'

dag_path = maya_api_utils.get_dag_path(shape)

mfn_nurbs = OpenMaya.MFnNurbsSurface(dag_path )

point = OpenMaya.MPoint(0.0, 3.116, 4.508)

u = MScriptUtil().asDoublePtr()

v = MScriptUtil().asDoublePtr()

toto = mfn_nurbs.getParamAtPoint(point, u, v, False)

------------------------------------------------------------------------------------------------

Jefri Yeh

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Sep 9, 2015, 7:37:54 AM9/9/15

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you need to separate the MScriptUtil instancing to preserve the pointer.

uutil = MScriptUtil()

u = uutil.asDoublePtr()

vutil = MScriptUtil()

v = vutil.asDoublePtr()

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Rémi Deletrain

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Sep 9, 2015, 9:13:12 AM9/9/15

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Actually I do not have the crash problem. Many thank you r4inm4ker!

But now I have an error :

# RuntimeError (kInvalidParameter): value not valid in ranks #

while I give (MPoint, double, double, bool).

Well I guess the problem is MPoint, but I do not understand why.

He requested a position and I give him a Vector3 or Vector4 it's the same ...

Jefri Yeh

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Sep 9, 2015, 9:29:37 AM9/9/15

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I think that's because you are giving the MPoint position outside the nurbs surface range. Try pick a point on the surface and run it again. I've quickly tested it and that seems to be the reason of # RuntimeError (kInvalidParameter): value not in valid range # error.

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Rémi Deletrain

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Sep 9, 2015, 10:53:19 AM9/9/15

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This is actually due to the tolerance ...

Thank you very much again !!!

Le mercredi 9 septembre 2015 10:24:37 UTC+2, Rémi Deletrain a écrit :

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