[yt-users] Volume render with two variables?

[Scott Feister]

Hi everyone,

Is there a simple way to do a volume rendering of two variables
simultaneously? For example, if I wanted to overplot both density and
temperature into a single volume rendering. My naive method would be to
define a new variable which is a weighted sum of the two variables, and
sculpt the transfer function to have different colors over the range. I'm
just asking if there's a better way built into YT.

I've done a lot of searching through the documentation, but I can't find a
clear answer as to whether this is a built-in feature. I've seen examples
from a few years ago where both variables are rendered separately, and the
PNG files are combined. This ends up with both variables being
partially-transparent to the other variable; in my example, I'd prefer *not
*to see through a particularly high-temperature region. I've also seen
documentation on a "multi-variate transfer function", but that
documentation is pretty incomplete.

Thanks in advance!

Best,

Scott

Scott Feister, Ph.D.
Postdoctoral Researcher, Flash Center for Computational Science
University of Chicago, Department of Astronomy and Astrophysics
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