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Any closure can be output to a special passthroughoutputvariable() function to be output as an AOV. "Pass through" nodes are familiar to Softimage users: they can be inserted anywhere in a Shade Tree to register the downstream subtree as an output variable.

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Code Block closure diffuse_aov = Kd * diffuse(); closure specular_aov = Ks * specular(); Ci = passthroughoutputvariable("diffuse_aov", diffuse_aov) + passthroughoutputvariable("specular_aov", specular_aov);

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