Dynamically create and parent attribute with maya API

[Daniele Dolci]

Hi, 

I am creating as excercise a blendshape node inheriting from the MPxDeformerNode. I got it to work with 1 mesh as input, now I want to make it work with n inputs. I don't understand how to dynamically create attribute whose name is the name of the target. I mean if we have a maya blendshape, that is how it looks: 

But when you then access the pSphere2 attribute you don't need to do blendShape1.weight.pSphere1 but simply blendShape1.pSphere1.

If I query the type of the attribute weight it is a TDataCompound. 

I guess this is something that does not need to happen in the initialize of the plugin but rather creating a command that handles it in the doIt, redoIt etc and having some methods like addTarget and so on, right? If anyone could share some snippet or a little explanation on how to do it would be really appreciated!

Thanks,

Daniele

[Nicolas Combecave]

On a vanilla blendshape node, I believe blendShape1.weight is a multi attribute, and blendShape1.weight[0] has an alias named pSphere1

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[Daniele Dolci]

Hi,

Thanks for the reply, I tried by createing a float attribute with the API (MFnNumericAttribute) and set it to array and also set to keyable, to make it appear in the channel box, but the attribute I created did not get the indexing typicla of array, it is just a normal float. Could you make a small snippet of code to show how to implement it with api? Thank you! 

Il giorno giovedì 6 dicembre 2018 16:19:18 UTC+1, combi ha scritto:

On a vanilla blendshape node, I believe blendShape1.weight is a multi attribute, and blendShape1.weight[0] has an alias named pSphere1

Le jeu. 6 déc. 2018 à 16:09, Daniele Dolci <daniele...@gmail.com> a écrit :

Hi, 

I am creating as excercise a blendshape node inheriting from the MPxDeformerNode. I got it to work with 1 mesh as input, now I want to make it work with n inputs. I don't understand how to dynamically create attribute whose name is the name of the target. I mean if we have a maya blendshape, that is how it looks: 

But when you then access the pSphere2 attribute you don't need to do blendShape1.weight.pSphere1 but simply blendShape1.pSphere1.

If I query the type of the attribute weight it is a TDataCompound. 

I guess this is something that does not need to happen in the initialize of the plugin but rather creating a command that handles it in the doIt, redoIt etc and having some methods like addTarget and so on, right? If anyone could share some snippet or a little explanation on how to do it would be really appreciated!

Thanks,

Daniele

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[Daniele Dolci]

Basically I managed to creare the floatArray Attribute and assign aliases, but then I am not sure how to make those appear in the channel box, setKeyable to true is not enough... Any Hint?