Hi,
I'm trying to do a Node, where the input is a mesh and get the translation
matrix of it in the previous frame. But I don't get it.
I have tried using the MPlug getValue setting the MDGContext one frame
before, but it doesn't work.
This is the code, it is in C++
MStatus node::compute(const MPlug& plug, MDataBlock& data){
if (plug == dirX) {
MDataHandle dirXHandle = data.outputValue(dirX);
MDataHandle dirXHandleOld = data.outputValue(dirXOld);
MTime time = MAnimControl::currentTime();
MDGContext timeContextOld(time - 1);
MObject inputMeshObj = inputMeshHandle.asMesh();
MFnMesh meshFn(inputMeshObj);
MDagPath dagPath;
dagPath = meshFn.dagPath();
MFnDagNode transFn(dagPath);
MPlug matrixPlugArray = transFn.findPlug("worldMatrix");
matrixPlugArray.evaluateNumElements();
MPlug matrixPlug = matrixPlugArray.elementByPhysicalIndex(0);
MObject matrixO;
matrixPlug.getValue(matrixO, timeContextOld);
MFnMatrixData fnMat(matrixO);
MVector res = fnMat.transformation().getTranslation(MSpace::kWor ld);
// Set the output data.
dirXHandle.setFloat(0.0);
dirXHandleOld.setFloat(res.x);
}else {
return MS::kUnknownParameter;
}
return MS::kSuccess;
}
I am wondering also how the cacheFrame node works.
Can anyone help me?
Thanks
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