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Overview

The Ridged Flows Erosion filter provides highly adjustable simulated erosion. The filter simulates water raining on the terrain, moving downhill according to the normal of the terrain, eroding and depositing sediment along the way. 


Parameters

  • Iterations
    The number of iterations the simulation will run for. A higher iteration count will result in a stronger effect. 


  • Viscosity
    The viscosity with which the rain will run down the terrain. 


  • Evaporation
    The amount of water that is lost every iteration in each droplet. 


  • Velocity Threshold
    Eliminates rain droplets once their velocity becomes too low. The parameter is inverted, so 0 means no droplets will be eliminated.


  • Rain Strength
    The amount of rain that is dropped at the start of the simulation.


  • Smoothness
    Smoothes the path of the individual rain droplets.


  • Flow Cutoff
    Eliminates rain droplets once their water becomes too low. The parameter is inverted, so 0 means no droplets will be eliminated.


  • Flow Smoothness
    Smoothes the continuous flow of the rain droplets.


  • Sign
    Changes a parameter in the flow direction computation.


  • Sample Size
    Controls the sample area the flow direction computation uses.


  • Depth
    Controls the depth of the erodable sediment. This influences erosion and sedimentation strength.


  • Erosion
    A factor that affects the final amount of sediment eroded from the terrain. Any other value than 1 can disturb the equilibrium of the filter and add/remove matter from the terrain.


  • Sediment
    A factor that affects the final amount of sediment deposited onto the terrain. Any other value than 1 can disturb the equilibrium of the filter and add/remove matter from the terrain. 


  • Erosion Length Factor
    Controls the smoothness of erosions. Lower values result in larger connected streams and higher values in more separated areas.


  • Sediment Length Factor
    Controls the smoothness of sedimentation. Lower values result in smaller structures and higher values in more connected streams.


  • Start Resolution
    Changes the map resolution the algorithm uses for its flow direction computation. A higher value might yield better results but can require more computational performance.


Results

base erosion
stronger erosion
strong ridged
sharp ridges