How to blend VrayDirt radius and dirt map

[gimu]

Hi guys, basically what i want to do is to achieve the same effect in 3DS Max. In Max, we can assign a dirt map on radius slot, and we can control how long the radius will going by changing the radius value. How to do this in VrayBlender? Thanks

[bdancer]

Here is the setup https://github.com/bdancer/vb30/wiki -> "Dirt Radius Mapping"

[gimu]

thanks andrey, it works!
i guess float operation node is an useful node
so what is float operation node actually? this quite technical thing for me