Hydraulic Sediment

Overview

The Hydraulic Sediment Filter combines hydraulic erosion and thermal erosion in one filter which allows it to create highly realistic erosion. It also provides sediment layer features with varying erodability to further enhance the realism of the terrain.

Parameters

General Settings

• Iterations

  The number of iterations for which the simulation is run.

• Max Erosion Amount

  The maximum amount of material that can be eroded at each pixel.

• Level Step Multiplier

  Multiplier for the filter's erosion delta at each level step. This can help the filter to increase its power at higher levels, where the effect would normally be reduced due to the greater distance between locations (from the higher resolution).

Hydraulic Erosion

• Surface Erosion

  The strength of the erosion.

• Sediment Loss

  Steady amount of sediment that is suspended each step.

• Suspend Loss

  How fast a droplet disposes of sediment.

• Erosion Sample Offset

  Increases the droplet travel distance.

• Erosion Softness

  Softens the erosion result.

• Erosion Height Range

  Limits the erosion to a specific height range of the terrain.

• Flow Rotation

  Rotates the flow direction of a droplet, creating more dune-like sedimentation.

• Evaporation

  The amount of water that is lost in each simulation step.

Rain

• Rain Strength

  Constant fluid increase, that is added with each simulation step.

• Rain Probability

  Lowers the chance of rain appearing in a simulation step.

• Water Start

  The amount of available water at the start of the simulation.

Wind

• Wind Strength

  Adds additional wind to the water particles.

• Wind Direction

  Changes the direction of the wind.

• Wind Randomness

  Layers additional noise over the wind direction.

Thermal

• Thermal Erosion Strength

  The strength of the thermal erosion.

• Thermal Erosion Sediment Loss

  Constant amount of sediment that is placed at each simulation step.

• Sediment Transport Speed

  How fast thermally eroded sediment travels downhill.

• Thermal Erosion Slope

  The angle at which a pixel will become unstable and contribute to the thermal erosion.

• Thermal Sedimentation Slope

  The angle at which thermally eroded sediment will settle.

• Thermal Slope Smoothing

  Smooths the thermal erosions result.

Surface Layers

• Layer Strength

  Strength of the layering feature. Offers control for the lower layer ending and upper layer ending blending.

• Scale

  The scale of each layer. Decrease this value to get more layers.

• Height Offset

  Shifts the layers up and down.

• Layer Smoothing

  Smoothens the transition between layers.

• Variance Strength

  Adds noise to the height and offset of the layers.

• Variance Scale

  Adjusts the scale of the noise which is applied in the variance step.

• Variance Offset

  Shifts the variance noise.

• Variance Noise Octaves

  The octaves of the variance noise.

Results