How to mask vector field by scalar field?

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Hi, I am doing smoke simulation with one custom vector field Cd to colorize my smoke and I want to mask it by density field

i have tried Gas Calculate with Cd as dest field and density as source, calculation method set to Multiply but it is obviously not working. Maybe because Cd is vector and density is scalar (because the same setup works when i use vel as source, but of course with wrong results)

is there any way to make it work?
Tomas Slancik
FX Supervisor
Method Studios, NY
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I've found Gas Field VOP, it is working now
but i am still curious if it is possible with Gas Calculate
Tomas Slancik
FX Supervisor
Method Studios, NY
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