instancer node and inputPoints

[pety20...@gmail.com]

hi.
what is inputPoints attribute type in instancer nodes??
how i can read or write them???
and how i can have it in my node and connect it to one instancer node?

[ha...@haggi.de]

The inputPoints attribute is an compound attribute which contains data
necessary to transform instances. All necessary infos are described
here:
https://knowledge.autodesk.com/search-result/caas/CloudHelp/cloudhelp/2015/ENU/Maya-Tech-Docs/Nodes/instancer-html.html

[ha...@haggi.de]

Sorry, I was wrong, it is not an compound attribute but a generic array
which contains other arrays.

[pety20...@gmail.com]

Thanks, I think I should see an example :)
I did not see any examples:|

[haggi krey]

I only have some cpp hints:

Create an attribute

MFnTypedAttribute tAttr;

outInstanceData = tAttr.create( "outInstanceData", "oid", MFnData::kDynArrayAttrs);

In compute create the data object:

        if( plug == outInstanceData)
        {
            MFnArrayAttrsData    instancePointDataFn;
            MObject                instancePointDataObj = instancePointDataFn.create();
 
            fillInstancerArrays(instancePointDataFn);  // this is a user defined method
 
            MDataHandle instanceDataHandle = datablock.outputValue(outInstanceData);
            instanceDataHandle.setMObject(instancePointDataObj);
        }

Fill the arrays:

First create the array:

        MVectorArray outPosArray = arrayData.vectorArray("position");

        outPosArray.setLength(yourPositionArraySize);
        for( size_t i = 0; i < yourArraySize; i++)
        {
            outPosArray[i] = MVector(x,y,z);
        }         

Following this pattern you can add any additional arrays like intArray, double and so on.