Export and re-assign shaders, nodes and node data #maya

export_nodes_and_store_node_data.py

import maya.cmds as cmds

def getAttributes(object):
    attributes = cmds.listAttr(object)
    for attribute in attributes:
        try:
            print attribute + ' = ' + str(cmds.getAttr(object + '.' + attribute))
        except:
            pass


def getConnections( selected ):
    connections = cmds.listConnections(selected, c=True)
    for connection in connections: 
        print connection


for selected in cmds.ls(sl=True):
    # Store attributes from (selected) transform node in JSON
    transformAttrs = getAttributes( selected )
    # To do: store transformAttrs in JSON
    
    # Store attributes from shape node in JSON
    relatives = cmds.listRelatives( selected )
    for relative in relatives:
        shapeAttrs = getAttributes( relative )
    # To do: store shapeAttrs in JSON

    # Store connections in JSON
    connections = getConnections( selected )
    # To do: export connected nodes

export_shader_assignment_table.py

import maya.cmds as cmds

def getShaders( obj ):
    cmds.select( obj )
    cmds.hyperShade( shaderNetworksSelectMaterialNodes=True )
    return cmds.ls(sl=True) # Returns all shaders associated with the object (shape, face etc)


def getShadersPerFace( shape ):
    perFaceShaders= {}
    for f in range( cmds.polyEvaluate(shape, f=True ) ):
        face = shape+'.f[' + str(f)+ ']'
        try:
            shader = getShader(face)
            perFaceShaders[face] = shader
        except:
            print 'Error: could not fetch shader for ' + face
            
    return perFaceShaders


def recordShaderAssignment( shape, shaders ):
    print type(shaders)
    if str(type(shaders)) == '<type \'list\'>':
        print 'To do: Store assignment of shader per shape'
    if str(type(shaders)) == '<type \'dict'>':
        print 'To do: Store assignment of shaders per face'
    

# ----------------------------------------------------------------------------------

# Get selection
selection = cmds.ls(sl=1)

for shape in selection:
    # Get shaders for shape
    shaders = getShaders( shape )
    
    if len(shaders) == 1:
      # Just one shader applied to shape
      recordShaderAssignment( shape, shaders )
    else:
      # More than one shader assigned to object (per face shader assignment detected)
      shadersPerFace = getShadersPerFace(shape)
      recordShaderAssignment( shape, shadersPerFace )

# Re-set to original selection
cmds.select(selection)

export_shading_groups.py

import maya.cmds as cmds

# get shapes of selection:
shapesInSel = cmds.ls(dag=1,o=1,s=1,sl=1)
# get shading groups from shapes:
shadingGrps = cmds.listConnections(shapesInSel,type='shadingEngine')
# remove duplicate shading groups from list
shadingGrps = list(set(shadingGrps))
# get the shaders:
shaders = cmds.ls(cmds.listConnections(shadingGrps),materials=1)
# remove duplicate shaders from list
shaders = list(set(shaders))


# to do: export shading shaders/shadingGroups to disk

Do it! Do it! thumbs up