Density / Ambient vs Alpha

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Hi,

I have a quick question for volume rendering. It is possible to render out a AOV witch takes in account the density of a volume? Basically as thicker volume is it should be darker, where the less dense regions should be white. I have made a reference jpg from a render in maya witch uses a gradient ramp attached to the Incandescence color. Please look at the attached reference and point me in the right direction to replicate that in Houdini mantra.

Thank you!

Cheers,
M

Attachments:
Alpha_vs_Density.jpg (95.2 KB)

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