# Altering transparency / thickness of rising smoke

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.

• Perhaps turn on flame and use its material properties to drive opacity? – 3pointedit Mar 14 '18 at 4:39

You can use generated coordinates and a mapping node to control the placement. In this case note the rotation on the $Y$ axis.