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Procedural Foliage Max Angel or other option

When using procedural foliage is it possible to not apply it to raised terrain or set a max angle like you could in the painter? When designing a level and using procedural grass or trees how do you keep those off uneven elevations? Thank you.

The outputs to the grass node are in the range of 0-1. You need to use a slopemask or other maths to figure out where you want it to go. Think of it like an alpha.

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Awesome thank you I know exactly what to do now.