# Ridged Flows

## **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**

<table><thead><tr><th width="199.7999267578125">Property</th><th>Description</th></tr></thead><tbody><tr><td><strong>Iterations</strong></td><td>The number of iterations the simulation will run for. A higher iteration count will result in a stronger effect.</td></tr><tr><td><strong>Viscosity</strong></td><td>The viscosity with which the rain will run down the terrain.</td></tr><tr><td><strong>Evaporation</strong></td><td>The amount of water that is lost every iteration in each droplet.</td></tr><tr><td><strong>Velocity Threshold</strong></td><td>Eliminates rain droplets once their velocity becomes too low. The parameter is inverted, so 0 means no droplets will be eliminated.</td></tr><tr><td><strong>Rain Strength</strong></td><td>The amount of rain that is dropped at the start of the simulation.</td></tr><tr><td><strong>Smoothness</strong></td><td>Smooths the path of the individual rain droplets.</td></tr><tr><td><strong>Flow Cutoff</strong></td><td>Eliminates rain droplets once their water becomes too low. The parameter is inverted, so 0 means no droplets will be eliminated.</td></tr><tr><td><strong>Flow Smoothness</strong></td><td>Smooths the continuous flow of the rain droplets.</td></tr><tr><td><strong>Sign</strong></td><td>Changes a parameter in the flow direction computation.</td></tr><tr><td><strong>Sample Size</strong></td><td>Controls the sample area the flow direction computation uses.</td></tr><tr><td><strong>Depth</strong></td><td>Controls the depth of the erodible sediment. This influences erosion and sedimentation strength.</td></tr><tr><td><strong>Erosion</strong></td><td>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.</td></tr><tr><td><strong>Sediment</strong></td><td>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.</td></tr><tr><td><strong>Erosion Length Factor</strong></td><td>Controls the smoothness of erosions. Lower values result in larger connected streams and higher values in more separated areas.</td></tr><tr><td><strong>Sediment Length Factor</strong></td><td>Controls the smoothness of sedimentation. Lower values result in smaller structures and higher values in more connected streams.</td></tr><tr><td><strong>Start Resolution</strong></td><td>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.</td></tr></tbody></table>

## **Results**

<div><figure><img src="/files/tiiU6L8HDx6k1Uycm16L" alt=""><figcaption></figcaption></figure> <figure><img src="/files/bTcSDdQafHy80r5ZM1nm" alt=""><figcaption></figcaption></figure></div>


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