X(a*Altitude+b)

This filter modulates the scale of the noise according to an object's altitude.

In this filter, a determines how fast the noise is scaled by altitude. A lower value creates a gradual transition, while higher values create sharper transitions.

To apply noise at higher altitudes make sure a is positive. At high altitudes b controls the transition. The higher the transition, the lower the number. So, at high altitudes b should be a negative number.

To apply noise at lower altitude, reverse the variables so that a is negative and b is positive.

The Altitude filter works on the altitude of an object in World Space. In this example, Altitude (bottom) was applied to RND Continuous noise (top) and then to objects in a scene.

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