World Creator - Documentation and Support

Related articles:

• Filters Introduction
  
• General Filter Parameters                  

Overview

The Thin Flows Erosion filter offers a highly adjustable particle-based erosion and thinking of it as a simulation running many individual droplets is key to understanding all of its properties. 

The filter simulates a water droplet with a set amount of water that influences its carrying capacity and speed.  The droplet moves downwards under the influence of gravity, eroding and depositing sediment in its path.

TABLE OF CONTENTS

• Overview
• Parameters
• Results

Parameters

• Seed
  Changes the seed for the rain droplet distribution and other parameters used in the simulation.

• Rain Strength
  This lets you adjust the amount of droplets spawned on the terrain. You can also further modify the rain strengths on each level step in the level step editor below the slider.
  The level step that a droplet runs on heavily impacts the structures the filter will produce. Lower levels generate wider crevices and sedimentation, while higher levels create more intricate details.

• Acceleration
  How fast a droplet accelerates due to gravity. This has an influence on the speed and distance it can travel.

• Density
  The density of a droplet influences the speed and acceleration of a droplet.

• Friction
  How much speed is lost in each droplet step.

• Initial Water
  Sets the amount of water a droplet has when it is spawned. The water influences its maximum lifetime and the amount of sediment it can carry.

• Max Length
  Sets the maximum travel length of a droplet in pixels.

• Evaporation
  How much water is lost at each stage of a droplet's journey.

• Transport Rate
  Modifies the amount of sediment a droplet can carry.

• Sediment Loss
  This describes a constant percentage of sediment that a droplet will lose in every movement step it takes. 

• Erosion Multiplier
  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.

• Deposition Multiplier
  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.

• Flow Rotation
  Alters the starting direction of a particle.

• Random Rotation
  Normally, a droplet will have a downslope path when spawned. Increasing this value will randomize it.

• Wind Direction
  Allows you to set a wind direction, which will influence a particle's movement direction.

• Wind Strength
  Controls how strongly droplets will be affected by the wind.

Results

base erosion	rocky erosion
slippage erosion	soft erosion
thin flows I	thin flows II