"Add new item" with MFnNumericAttribute array (Maya)

Coding
1

Hello Tech Artists!

First off, I would like to thank the community for keeping up such a great site, especially one that has contributed to my studies as a Tech Artist. :):

I have a question about the “add new item” button that occurs with attributes of type array in the Maya API.
How can I achieve this button?


I am creatiing an MFnNumericAttribute of type array as such in the initialize function:

MStatus BumpyNode::initialize()
{
MStatus status;

MFnNumericAttribute numFn;

mainTexture = numFn.create("mainTexture", "mainTexture",
                           MFnNumericData::kFloat);
numFn.setWritable(true);
numFn.setKeyable(true);
numFn.setStorable(true);
numFn.setChannelBox(false);
addAttribute(mainTexture);

inputTextures = numFn.create("inputTextures", "inputTextures",
        MFnNumericData::kFloat);
numFn.setWritable(true);
numFn.setKeyable(true);
numFn.setStorable(true);
numFn.setChannelBox(false);
numFn.setArray(true);
addAttribute(inputTextures);

blendValues = numFn.create("blendValues", "blendValues",
                           MFnNumericData::kFloat);
numFn.setArray(true);
numFn.setKeyable(true);
numFn.setConnectable(false);
numFn.setUsesArrayDataBuilder(true);
addAttribute(blendValues);

outputNormalValue = numFn.create("outputNormalValue", "outNormal",
        MFnNumericData::kFloat);
addAttribute(outputNormalValue);

attributeAffects(mainTexture, outputNormalValue);
attributeAffects(inputTextures, outputNormalValue);
attributeAffects(blendValues, outputNormalValue);

return MS::kSuccess;

}

I am using the ArrayDataBuilder to create elements inside of my compute function, but I would like the user to be able to create an array value at runtime.

This is my output:


Thanks for reading!