maya c++ api: output array of matrices

[Sven Pohle]

hi,

i'm just getting back to some maya api c++ and am hitting my head on the following:

i have an input and output array of matrices. for the number of inputs i want the node to create the number of outputs. but my following code doesn't seem to work. i based it on some devkit nodes who do something similar with other data types as outputs. any help?

// initialize
aInputMatrices = mAttr.create("inputMatrices", "inputMatrices");
mAttr.setStorable(false);
mAttr.setConnectable(true);
mAttr.setArray(true);
mAttr.setHidden(true);
mAttr.setUsesArrayDataBuilder(true);
addAttribute(aInputMatrices);

aOutputMatrices = mAttr.create("outputMatrices", "outputMatrices");
mAttr.setStorable(false);
mAttr.setWritable(false);
mAttr.setStorable(false);
mAttr.setArray(true);
mAttr.setUsesArrayDataBuilder(true);
addAttribute(aOutputMatrices);
attributeAffects(aInputMatrices, aOutputMatrices);


// compute method
MStatus status;

    MArrayDataHandle hInputMatrices = data.inputArrayValue(aInputMatrices, &status);
    CHECK_MSTATUS_AND_RETURN_IT(status);

    cout << "count: " << hInputMatrices.elementCount() << endl;

    MArrayDataHandle hOutputMatrices = data.outputArrayValue(aOutputMatrices, &status);
    CHECK_MSTATUS_AND_RETURN_IT(status);

    MArrayDataBuilder builder(aOutputMatrices, hInputMatrices.elementCount(), &status);
    CHECK_MSTATUS_AND_RETURN_IT(status);

    for (unsigned int listIndex=0; hInputMatrices.elementCount(); listIndex++) {
        cout << listIndex << endl;
        MDataHandle outHandle = builder.addElement(listIndex);

        hInputMatrices.jumpToElement(listIndex);
        MMatrix curMat = hInputMatrices.inputValue(&status).asMatrix();

        outHandle.setMMatrix(curMat);
    }

    status = hOutputMatrices.set(builder);
    CHECK_MSTATUS_AND_RETURN_IT(status);

    status = hOutputMatrices.setAllClean();
    CHECK_MSTATUS_AND_RETURN_IT(status);

    return status;

[Justin Israel]

Is this a typo?
Did you really want:

for (unsigned int listIndex=0; i <  hInputMatrices.elementCount(); listIndex++) {

        cout << listIndex << endl;
        MDataHandle outHandle = builder.addElement(listIndex);

        hInputMatrices.jumpToElement(listIndex);
        MMatrix curMat = hInputMatrices.inputValue(&status).asMatrix();

        outHandle.setMMatrix(curMat);
    }

    status = hOutputMatrices.set(builder);
    CHECK_MSTATUS_AND_RETURN_IT(status);

    status = hOutputMatrices.setAllClean();
    CHECK_MSTATUS_AND_RETURN_IT(status);

    return status;

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[Sven Pohle]

yes, found that earlier after stripping it all down. thanks justing :)

--sven

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