MFn (library) MIt (iterators) MPx (Acting)
1.MFn - FunctionSet classes
Overview:
Library covers all nodes within the Maya, each node can be found in the corresponding class class
Features:
To help users to access your reception underlying method, modify the content of the scene
example:
MFnDependencyNode
MFnDagNode
MFnMesh
2.MIt - Iterator classes
Overview:
Iterator class in Maya, according to common requirements for class offered
Features:
Access to a large number of elements one by one, for each iteration, the pointer points to different elements
example:
MItDag
MItMeshVertex
MItSelectionList
3.MPx - Proxy classes
Overview:
Maya elements proxy class for extending existing functionality Maya
Features:
By integrating existing user class, and override fixing method, to reconstruct a new node
example:
MPxCommand extended command
MPxNode extension node
MFnDeformerNode extended deformities
to sum up:
MFn method: mainly Maya available to users, providing richer functionality than the command
MIt method: the user is also called batch processing of content maya
MPx Method: user according to a fixed format drawing process, using MFn and MIt which way to enrich Maya features, such methods have to call Maya
