Thanks Matt now the structure and dependencies is more obvious for me. But still i confused about behaviour of "Sample" cluster attached to CustomOperator.
That's how i connected in & out ports of CustomOperator: http://take.ms/saEYZ After i change geometry (add one additional edge) this cluster wasn't expanded. It consist of the same number of elements. I check 'always complete' property of this cluster and the value is "true". After all new samples elements appear in this cluster but only after i freez modelling stack. Also it seams that if i didn't have new samples in my "Sample" cluster i can't reach UV values of new component from CClusterPropertyElementArray. And since i connect Cluster object to the out port i can't use OutputPort.PutValue() (this method works only with Parameters). So maybe there's a way to force my "sample" cluster to update its elements ? Or maybe to create and overwrite cluster connected to out port with new instance of cluster. The only method i know is to use Geometry.AddCluster(). But i guess it's not appropriate to create such objects from Operator.
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