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

Property	Description
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

Property	Description
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

Property	Description
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

Property	Description
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

Property	Description
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

Property	Description
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