Here is an interesting article about the digital integration and sculpture. It was written a while ago, but it has some great artist links and a little history.

The Aesthetic Evolution of Digital Sculpture
by Christiane Paul

To determine the date (or even year) of birth of an art form or artistic technique is always a problematic if not futile endeavor but it might be safe to say that the 1990s are the decade when digital/virtual sculpture officially began to exist -- even if it had its roots in earlier experiments.

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http://www.sculpture.org/documents/webspec/digscul/digscul.shtml