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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Perhaps turn on flame and use its material properties to drive opacity? – 3pointedit Mar 14 '18 at 04:39
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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.
