FYI I’m assuming that the folks here are aware of the awesome work that the Scientific Computing Institute at U. of UTAH (i.e., SCI Utah) have done with multidimensional transfer functions. They have some interactive, open source software for interactive creation of transfer functions that you can dig up. Or check out this PhD thesis: MULTIVARIATE TRANSFER FUNCTION DESIGN. There is lots more info available, if anyone needs help I can help connect you to the right people at SCI.
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