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Mask Flow

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Runs a flow simulation on mask. Internally uses the vertLab Attribute Flow modifier.

Settings

Mix

Mix generated mask with existing one.

  • Blend Mode: Blend mode with existing mask:
    • Disable: Disable blend.
    • Replace: Replace A with B.
    • Multiply: Muliply A by B.
    • Add: Add B to A.
    • Min: Minimum value of A and B.
    • Max: Maximum value of A and B.
    • Screen: Brighten A using the brightness of B.
    • Overlay: Brighten/darken A using values above/below 0.5 on B.
    • Divide: Divide A by B.
    • Subtract: Subract B from A.
  • Opacity: Opacity of blend.

Direction

Direction of flow.

  • Space: Coordinate space of flow direction:
    • Local: Flow direction is in local space (uses object rotation).
    • Global: Flow direction is in global space (ignores object rotation).
  • Direction X: Flow direction vector.
  • Y.
  • Z.
  • Bidirectional: Run flow similuation twice in opposite directions.
  • Random: Mix in random noise to flow direction. A value of 1 will completely ignore specified direction.

Random Noise

Noise settings for the random direction.

  • Noise Scale: Size of the largest features in the noise.
  • Octaves: The number of noise octaves. Higher values give more detailed noise but increase render time.
  • Roughness: Blend factor between an octave and its previous one. A value of zero corresponds to zero detail.
  • Noise Offset: Offset the noise W position. Effectively a smooth transition between seeds.

Flow Steps

Flow simulation settings.

  • Flow Iterations: How many iterations of flow to calculate.
  • Step Size: Maximum distance travelled by each flow step. Bigger step sizes are cheaper to calculate but can result in stepping artifacts.
  • Fade: Fade the head/tail of the flow simulation. Positive values will fade the tail (allowing darker areas to flow over lighter areas). Negative values fade the head resulting in a smooth fade out of the flow.
  • Minimum Angle Speed: Decrease flow speed depending on surface angle. 0 will completely stop flow on surfaces perpendicular to the flow direction. 1 will ignore the surface angle and full flow speed will occur everywhere.

Streaks

Add streaks/noise to the flow simulation.

  • Amount: Intensity of streaks applied to flow simulation.
  • Thickness: Scale of the noise used for streaks. Higher value = thicker streaks.
  • Offset: Offset the streak noise W position. Effectively a smooth transition between seeds.

Noise Values

  • Noise Octaves: The number of noise octaves. Higher values give more detailed noise but are more expensive. Stop increasing when there is no visual impact.
  • Noise Roughness: Blend factor between an octave and its previous one. A value of zero corresponds to zero detail.
  • Stretch: Stretch the noise used for streaks in the flow direction. 0 = No stretch, uniform noise. 1 = Maximum stretch, 2D noise.
  • Contrast: Increase value contrast of noise, giving higher contrast streaks.
  • Bias: Midpoint of contrast operation. Higher values will produce a darker noise.