I'm writing an algorithm to find clusters in 3D data, and I need a source of data to test it with.

Purely random datasets produce results that are impossible to say whether the cluster detection is good or bad. And every attempt I tried so far to generate "random clusters" hasn't really worked either.

So, if anyone knows of any freely available 3D datasets that are known to exhibit clustering? Or if you have thoughts on how to generate same?

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

In reply to 3D test data that exhibits clustering? by BrowserUk

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