Getting shader info from an ASS file


First, set things up so you can use the Arnold Python API. On Windows:

set PATH=C:\Users\blairs\AppData\Local\Programs\Python\Python39;%PATH%
set PYTHONPATH=C:\solidangle\arnold\Arnold-6.2.1.1-windows\python

rem Sometimes necessary
set PATH=C:\solidangle\arnold\Arnold-6.2.1.1-windows\bin;%PATH%

Then, run this Python script, which does the following:

  • Sets the logging verbosity
  • Loads an ASS file
  • Loops over all the shader nodes.
  • If a shader is a standard_surface, inspect the ID AOV parameters.
from arnold import *
AiBegin()
 
AiMsgSetConsoleFlags(AI_LOG_ALL)
 
# Required if the ASS file uses any SItoA shaders
#AiLoadPlugins('C:/softimage/workgroups/sitoa-3.4.0-2015/Addons/SItoA/Application/Plugins/bin/nt-x86-64')
 
AiASSLoad('C:/Users/blairs/Documents/maya/projects/default/scenes/denoiseme.0009.ass')
 
# Iterate over all shader nodes
iter = AiUniverseGetNodeIterator(AI_NODE_SHADER);
while not AiNodeIteratorFinished(iter):
    node = AiNodeIteratorGetNext(iter)
    print( "[script] AiNodeGetName: {0}".format( AiNodeGetName( node ) ) )

    ne = AiNodeGetNodeEntry( node )
#    print( "[script]  AiNodeEntryGetName: {0}".format( AiNodeEntryGetName( ne ) ) )
#    print( "[script]  AiNodeEntryGetType: {0}".format( AiNodeEntryGetType( ne ) ) )
#    print( "[script]  AiNodeEntryGetTypeName: {0}".format( AiNodeEntryGetTypeName( ne ) ) )

    if AiNodeIs( node, "standard_surface" ):
        
     
        # Plain color ID AOVs are easy
        aov_id1 = AiNodeGetStr( node, "aov_id1" )
        print( "[script]  aov_id1={0}".format( aov_id1 )  )   
        
        id1 = AiNodeGetRGB( node, "id1" )
        print( "[script]  id1={0} {1} {2}".format( id1.r, id1.g, id1.b)  )   


        # ID AOVs that use a linked shader take a bit more work     
        aov_id2 = AiNodeGetStr( node, "aov_id2" )
        print( "[script]  aov_id2={0}".format( aov_id2 )  )   
        if AiNodeIsLinked( node, "id2" ):
            id2 = AiNodeGetLink( node, "id2" )
            print( "[script]  id2={0}".format( AiNodeGetName( id2 ) ) )


AiNodeIteratorDestroy(iter)
AiEnd()

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