For my example I have limited it to a relatively small number of iterations to demonstrate the concept.įirstly, rather than manually generate the node structures for the calculation I have created an add-on to generate the nodes directly from an entered expression (it's something I've been meaning to do for quite some time - building on the answer Cycles Materials Math node with more than two inputs). The example image you provided must have been produced with a large number of iterations of the calculation - which would take a considerable amount of time to render. However, it is possible to produce such a result as shown below (assuming I've got my maths correct). It's impossible to tell what's going wrong in your particular case as there just isn't enough information in your question - you've only partially shown the 'internal' node tree (many of the nodes are hidden, meaning it's impossible to verify that they aren't marked as 'Clamped' and left assuming that, say, 'Root' is raising to the power of 0.5) and you don't show any detail of how the group is actually being used (it's hinted at behind your 'group' nodes but nothing explicit) - which is quite critical.
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