X(a*Slope+b)

This filter applies noise based on an object's slope. Slope can range anywhere from flat and horizontal to steep and vertical. This is an excellent filter to use if you want to isolate a texture to vertical cliffs or flat surfaces.

In this filter, a determines the steepness of the noise (-4 is flat, 4 is vertical). The b variable controls the starting point of the transition.

To place noise on vertical surfaces make a=4 and b=2.

To place noise on flat surfaces make a=-4 and b=1.5.

The Slope filter works on the slope of an object in World Space. In this example, the default Slope (bottom) was applied to Fract Stone noise (top) and then to objects in a scene.

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