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Aspect Filter generates a mask based on the horizontal direction a terrain face is pointing. This lets you target north-facing slopes, south-facing slopes, or any custom direction. It is useful for effects like snow accumulation on shaded north-facing slopes or dry vegetation on sun-facing south sides. The facing direction is controlled by a rotation angle — the filter uses the terrain surface normals to determine which parts of the terrain face that direction.

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Settings

  • Blend Mode — how this filter combines with the previous mask in the stack. Multiply narrows the spawn area; Add expands it.
  • Rotation — the direction angle (in degrees) to target. 0° targets one cardinal direction; rotating changes which direction is masked.
  • Epsilon — the kernel size used for aspect detection. Larger values smooth out the detection and pick up broader directional trends. Default is 1.0.
  • Effect Strength — overall strength of the masking effect. Default is 1.0.
  • Remap Curve — remaps the raw aspect values before the final mask is produced. Adjust this to control how strongly directional alignment translates into mask intensity.