Usually when implementing a Maya deformer nodes one inherits MPxDeformerNode and overrides the deform method. MPxDeformerNode calls deform for each of the input geometries and passes their world matrix.
Does anybody know how the MPxDeformerNode gets the world matrix?
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slavomir kaslev
Never mind, I figured that out by myself.
The MFnMeshData that comes as input from the input geometry plug is a subclass of MFnGeometryData which cat be associated with a matrix (MFnGeometryData::getMatrix/MFnGeometryData::setMatrix).
The matrix stored there is the input's world matrix.