What inputs does a particleInstancerNode need?

[haggi_master]

Hi,

I wrote a shape node which reads particle data via the Disney open source Partio library what works quite fine. Now I want be able to output the correct data in a way which allows me to connect the ouput to an particle instancer node. As much as I know this is a quite complex nested compound attribute. Does anyone know the structure of such an attribute?

[haggi_master]

What I have tried so far is defining an output as:

	outInstanceData = tAttr.create( "outInstanceData", "outInstanceData", MFnData::kDynArrayAttrs);
	tAttr.setStorable(false);
	addAttribute( outInstanceData );

And in the compute method I created some test Data:

		MFnArrayAttrsData	instancePointDataFn;
		MObject				instancePointDataObj = instancePointDataFn.create();
		MVectorArray		outPosArray = instancePointDataFn.vectorArray("position");
		MIntArray			outIdArray = instancePointDataFn.intArray("id");
		MDoubleArray		outAgeArray = instancePointDataFn.doubleArray("age");

		MDataHandle instanceDataHandle = datablock.outputValue(outInstanceData);
		instanceDataHandle.setMObject(instancePointDataObj);

		outPosArray.append(MVector(0,0,0));
		outPosArray.append(MVector(1,0,0));
		outPosArray.append(MVector(2,0,0));
		outPosArray.append(MVector(3,0,0));

		outIdArray.append(0);
		outIdArray.append(1);
		outIdArray.append(2);
		outIdArray.append(3);

		outAgeArray.append(0.0);
		outAgeArray.append(0.1);
		outAgeArray.append(0.2);
		outAgeArray.append(0.3);

		datablock.setClean(plug);

But this was not successful, I do not see any instances. So what's wrong here?

[haggi_master · Accepted solution]

If I set the line

instanceDataHandle.setMObject(instancePointDataObj);

at the end before the setClean(), the whole thing works fine.