Xb+a(Altitude-Slope)

This filter applies noise only at certain combinations of slope and altitude. The Altitude Minus Slope filter works on the slope and altitude of an object in World Space. In these examples, Altitude Minus Slope was applied to Voronoi DistSq4 and then to objects in a scene.

When a is positive and b is negative, noise is applied at high altitudes and on flat surfaces.

When a is negative and b is positive, noise is applied at low altitudes and on steep slopes.

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