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How to create a snow layer that only attaches on faces that look up?

How do i create a Material with a layer of snow that just grows on one axis, like in crysis when u rotate a snowy rock the snow alwys only is on the upper side. Really cool!

How? :o

Check out thisthread. It has the very basic expression for z-up facing material. Then just plug in your own textures to create snow.

there are people in this world called like: “bricktop” who are just awesome!

I googled ‘‘bricktop’’ like a noob. lol

The material function World_Aligned_Blend can do this for you. The up vector is the default vector, you just need to change bias and sharpness usually.