Enable Erosion

Click the [+] button in the panel header.

Nothing will immediately happen as you will need to advance frames for it to begin eroding.

The default settings are set in such a way as to give good results immediatley regardless of your terrain.

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Settings

All settings can be animated!

Header

Disable Erosion

Button to not calculate or show erosions results. Works whether the simulation is baked or not.

Remove Erosion

Button that will fully remove erosion and its settings.

Uncategorized

Delta Time

The time passed between each frame. To set according to the scene's frame rate, invert the fps. Ex: Scene is at 24 fps. Set the Delta Time to (1/24). If you click and type this formula into the setting input area Blender will calculate the correct decimal value.

Skip Frames

The amount of frames to skip calculations in order to speed up simulation baking. When skipping, the simulation will use the last calculated values and move the water, sediment, and other settings according to those last calculated values.

In testing, a setting of '4' does not show obvious differences than when skipping 0 frames. Greater than 4 frames the result will begin to differ from when not skipping any frames.

Hydraulic Erosion

Enable

Calculate the erosion and deposition process due to the destablization of sediment due to water over time.

Initial Water Amount

The amount of water per vertex at the start of the simulation.

Rain Rate

The amount of water to add to each vertex each frame of the simulation. Turn to 0 and add some Initial Water to have the water land where it may to get lakes and rivers.

Evaporation Rate

The amount of water to remove from each vertex each frame of the simulation.

Sediment Capacity

The amount of sediment dissolved in the water that is allowed at a vertex based upon the amount of water. When this capacity has been reached some soil will be deposited.

Use Sediment Transversal

Transfer the sediment around the terrain. Significantly increases simulation speed and so is off by default. Leaving this off will also give nicer looking screes when using the attributes outputed from the simulation.

Initial Sediment Amount

The initial amount of sediment to start the simulation with. Would not reccommend using this value without also increase the Initial Water Amount.

Erosion Rate

The rate at which sediment is dissolved into the water. Sediment erosion at each vertex is also dependent upon the respective water amount and existing sediment amount.

Deposition Rate

The rate at which sediment is deposited back onto the terrain.

Gravity

The rate at which water is pulled downwards.

Pipe Area

Effectively the amount of water can be passed from one vertex to another each frame.

Water Mesh

WARNING: The water mesh will slow down viewport simulation speed. Disable while caching or baking and enable once desired result is achieved.

Enable

Generate a mesh based on the simulation's water values at each vertex.

Threshold

The lowest water amount needed for a vertex to be included in the water mesh.

Subdivide

The amount of times to smoothly subdivide the water mesh.

WARNING: Simulating with subdivision while water mesh is enabled, the simulation will be slowed down considerably.

Material

The material to assign to the water mesh.

Thermal Erosion

Enable

Calculate the erosion and deposition process due to the destablization of sediment over time.

Erosion Rate

How much sediment is displaced each frame. Increase to speed up simulation times when Hydraulic Erosion is not enabled.

Reduce Calculations

Only calculate 4 out of the 8 neighbors of each vertex.

Hardness

Not all sediment is compacted at the same amount. Some soil is more easily destablized than others. A texture is used to increase or decreases the soil's ability to be eroded. Each frame hardness values are reduced (softened) as soil becomes less compacted due to erosion. Hardness values are not dependant upon terrain resolution.

Texture Seed

Randomize the hardness value at each vertex.

Texture Blur Amount

Blur the hardness texture for more uniform hardness areas.

Softening Rate

The amount to soften the soil each frame.

Softening Minimum

The lowest amount a vertex's hardness value can reach.

Bake

Blender's Simulation Baking Documentation

Bake

Calculate and store on disk the simulation's cache. Will not use the existing cache. Uses the scene's frame range unless Use Custom Range is enabled.

You must have the terrain object selected and the current blend file must be saved.

Will bake all geometry node simulations that exist on the terrain object.

Delete Bake

Remove the existing simulation cache, regardless if baked or not.

Advanced

Calculate to Frame

Similar to just hitting the play button and stopping it at specific frame, however, it will always begin at 0 and will automatically stop where the cursor was before simulation. Using this method allows you to see a man about a horse or other business dealing if needed and you won't have to worry about consuming a bunch of electricity.

You can not store non-baked files as baked files at this time. This is a Blender thing. Do not "at" us

Use Simulation Cache

Keep data around for each frame. If disabled and you change frames your cache will be gone even if returning to that frame again.

Use Custom Path

Specify where to store the baked cache files.

Custom Path

Path to store baked cache files.

Use Custom Range

Specify a different frame range than what the scene is set at.

Custom Start

What frame to begin simulating.

Custom End

What frame to end simulating.

Optimization Settings

Settings and ways that help speed up the simulation at the sake of inaccuracy. Many of these settings are included up top in their proper location too, but here collected for ease of access.

Skip Frames

The amount of frames to skip calculations in order to speed up simulation baking. When skipping, the simulation will use the last calculated values and move the water, sediment, and other settings according to those last calculated values.

In testing, a setting of '4' does not show obvious differences than when skipping 0 frames. Greater than 4 frames the result will begin to differ from when not skipping any frames.

Disable Hydraulic or Thermal Erosion

If you don't need one of the erosions your simulation will be faster disabling them.

Use Sediment Transversal (Hydraulic Erosion)

Transfer the sediment around the terrain. Significantly increases simulation speed and so is off by default. Leaving this off will also give nicer looking screes when using the attributes outputed from the simulation.

Disable Water Mesh

Reduce Calculations (Thermal Erosion )

Only calculate 4 out of the 8 neighbors of each vertex.

Outputted Attributes

You can type these into an attribute node in the shader nodes or shader section of True-Terrain.

TT Sediment Amount

The amount of sediment that has been deposited at each vertex. Good for creating scree like effects

TT Water Level

The height of the water at each vertex. Only when Water Mesh is generated and only stored on the water mesh for the assigned water material

TT Water Velocity

The velocity of the water at each vertex. Only when Water Mesh is generated and only stored on the water mesh for the assigned water material

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