How can I create a more transparent, thinner bottom area of smoke, then rising higher to be much thicker and opaque? It will not need to be animated.
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$\begingroup$ Perhaps turn on flame and use its material properties to drive opacity? $\endgroup$– 3pointeditCommented Mar 14, 2018 at 4:39
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1 Answer
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Use a Gradient texture to control the mix between the smoke density and a transparent shader.
You can use generated coordinates and a mapping node to control the placement. In this case note the rotation on the $Y$ axis.
After the Gradient texture you can use color ramp to control the placement for the transparency.
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1$\begingroup$ Very fancy: mathjax for axis names. $\endgroup$ Commented Mar 14, 2018 at 15:00