Can't figure out how to setup an expression for one of the attributes of the
roto/rotoshape shape, opacity for example.
import nuke
shps = nuke.toNode( 'Roto1' )['curves'].rootLayer
for shp in shps:
attrs = shp.getAttributes()
shp.set( 'opc', 0.5 )
Works like that, but how to set an expression instead of value? No
setExpression method for AnimAttributes.
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