Controls how many meters of bedrock or debris (here entrained material) is eroded every iteration.

Controls the softness of bedrock or debris (here entrained material). Higher values would make the terrain easier to erode, causing deeper incisions, more sediment, and more debris being deposited as a result.

Controls whether to use a mask for erodability or not.

The name of the erodability mask.

Controls the rate at which erosion happens. This is a multiplier on Erodability.

Sets the angle at which the riverbank rests relative to the riverbed. Lowre values would make wider and flatter river channels.

Controls whether to use a mask for bank angle or not.

The name of the bank angle mask.

The number of iterations of water spreading simulation to do. More iterations result in longer and less dense incisions.

Controls the softness of the eroding layer or material layer. Higher values would make the terrain easier to erode, causing deeper incisions, more sediment, and more debris being deposited as a result.

Controls whether to use a mask for erodability or not.

The name of the erodability mask.

Controls the rate at which erosion happens. This is a multiplier on Erodability.

Set the angle at which the thermal erosion would stop cutting beyond. A lower angle would make the cuts flatter and allow for more erosion to take place.

Controls whether to use a mask for cut angle or not.

The name of the cut angle mask.

Random seed to make erosion vary for the same set of variables on the same input.

Proportion of debris from hydro erosion that is deleted. This simulates water carrying away a certain amount of debris rather than it all accumulating. A value of 0 representes no deletion. Negative values correspond to the debris being less dense than the rock, so one unit of eroded rock produces more than one unit of debris.

Stop erosion when the debris layer reaches this depth.

Controls how biased the movement of material is. Setting it to positive values would bias the movement in the direction of the principal axes, and when set to negative values, it would bias the movement at angles of 45 degree relative to the principal axes. The default value of zero would mean no bias in any direction.

Controls whether to use a mask for grid bias or not.

The name of the grid bias mask.

The iteration where erodability would get to its maximum value.

Controls how much of the set erodability would the material have on its initial movement. It would increase over the set spread iterations until the max iteration, where it would stay at maximum set value.

Control how much the slope of the terrain would affect the erosion amount. Higher values would increase the slope effecting the erosion, and lower values would decrease it. Lowing this value would increase erodability as a result.

A multiplier on Erosion Rate that would cause a change on the riverbed only. Increasing this value would cause a more aggressive erosion on the bed, and as a result, it would increase the depth of the incisions.

Controls the rate at which the excess sediment turns into debris. A value of zero means no sediment is turned into debris, while a value of one will convert all created sediment into debris, and the bedrock would in turn be protected more by the created debris.

Controls whether to use a mask for deposition rate or not.

The name of the deposition rate mask.

The amount of sediment that can be carried per unit of moving water. The higher the capacity, the longer the material can erode before it starts depositing its excess sediment.

A multiplier on Erosion Rate that would cause a change on the riverbank only. Increasing this value would cause a more aggressive erosion on the bank, and as a result, it would increase the width of the incisions.

The maximum of bank to bed water column height ratio that will be considered as river bank bank. Ratios higher than this number will not be considered as bank during erosion.

Proportion of debris from thermal erosion that is deleted. This simulates wind carrying away a certain amount of debris rather than it all accumulating. The default is 0 (no deletion). Negative values correspond to the debris being less dense than the rock, so one unit of eroded rock produces more than one unit of debris.

Stop erosion when the debris layer reaches this depth.

Controls how biased the movement of material is. Setting it to positive values would bias the movement in the direction of the principal axes, and when set to negative values, it would bias the movement at angles of 45 degree relative to the principal axes. The default value of zero would mean no bias in any direction.

Controls whether to use a mask for grid bias or not.

The name of the grid bias mask.

The name of a mask layer controlling rainfall. The values in the layer are a scale on the Amount parameter. This is read from the second input.

The amount of rainfall simulated in each frame. If you use very large amounts you will not see much erosion since essentially the entire terrain would be under water.

How closely packed rain drops are. Smaller densities give more erosion lines. Larger densities create erosion cracks that are father apart and wider.

The rate of evaporation. A higher rate will leave less pooled water in each frame. If you want more water to pool you can increase Amount and/or decrease the evaporation rate.

This parameter can be used to expand the radius of each raindrop to cover more cells. This produces larger drops, which could make the incisions on the terrain more sparse and increase their width.

This parameter can be used to blur the column of water to make a smoother transition for each drop from a water cell to a dry cell. This parameter can be used to increase the width of the incisions on the terrain, while also making them smoother.

Controls the chunkiness of the water flow. A lower value would make the flow more continuous and a higher value would make the flow more chunky.

Smooth the water on the terrain as a post processing step.

How many iterations of the spread algorithm to run for each frame.

Controls the chunkiness of the debris flow. A lower value would make the flow more continuous and a higher value would make the flow more chunky.

Smooth the debris on the terrain as a post processing step.

Controls the movement of the debris based on last frame’s flow field. Higher values would stop the debris from moving near the flow channels, and lower values would cause the debris to ignore the flow channels, making it move independently.

The maximum height of wet debris that would not move due to water absorption. Beyond this limit the debris start to move again.

The maximum slope (measured in degrees from the horizontal) at which loose solid material will remain in place without sliding.

Controls whether to use a mask for repose angle or not.

The name of the repose angle mask.

Each frame of simulation the bedrock layer will be replaced with this layer in the second input. If not present, no replacement is done.

When the bedrock is changed, also adjust the terrain height. This allows for mountain building where the second input has an animated mountain growing, the net new height is added each frame while erosion occurs.

Adjusts how erodable rock is by how far it is away from the reference bedrock layer.

The depth for the strata. The Strata Erodability ramp uses this depth to control how deep it represents. A positive values means the strata represents hardness below the bedrock layer. Negative values mean the strata represents hardness above the bedrock layer.

Depths outside of the strata range will be clamped to the ends of the ramp. If clamping is off, they will repeat forming a periodic pattern.

How erodable rocks are at different strata depths. The left most is at the bedrock reference layer, the right most at the extreme strata depth. Values of 1 are fully erodable, such as loose dirt, and values of 0 prevent erosion, like granite.

If the input already has a debris layer (for example from a previous erode node, or painted manually), keep it as debris but ignore it in this node’s erosion calculations.

If the input already has a water layer (for example from a previous erode node, or painted manually), keep it as water but ignore it in this node’s erosion calculations.

If the input already has a water layer, delete it.

If the input already has a debris layer, delete it.

If the input already has a sediment layer, delete it.

Use the values in the debris layer to add to the height layer. You might turn this off, for example, if you plan to represent the debris layer some other way, such as a separately shaded volume, or instanced rock geometry.

Use the values in the water elevation layer to add to the height layer. The default is off. This will “bake” the water level into the height values, so for example pooled water will become flat terrain. This might be useful if you just want a very simple output where you will just color the “water” areas with a flat color.

The name of the height volume to operate on, usually height.

The name of the layer containing the water elevation (default water).

The name of the layer containing the debris elevation (default debris).

The name of the layer containing the sediment elevation (default sediment).

The reference layer for determining how far the current height has eroded. If not present on the input, is set to the original height of the terrain.

The node outputs a flow layer representing the cumulative water flow. This layer has two signed components (x and y) representing the flow direction in voxel space. Because this is cumulative, if water flows left, then flows right, those two motions will cancel and the x component would be 0.

The node outputs a flowdir layer containing vectors showing the average direction of flow at each voxel.

The node does not start simulation erosion until this frame. The default is 1 (the first frame).

Caches completed simulation frames in memory, for interactive scrubbing. For very large erosions, turning this option off is the best way to save memory.

When Cache simulation is on and this option is on, the simulation will start caching frames to disk when it reaches the Cache memory limit. Frames on disk will be slower to load than frames in memory, but still faster than re-simulating. When this option is off and the simulation reaches the limit, it simply starts deleting the oldest frames from the cache.

The maximum amount of memory (in megabytes) to use to cache simulated frames.

Applies a visualization material so you can see an elevation color ramp on the height field and see the water and debris layers as different colors.

Fill in the Min Elevation and Max elevation parameters using the current min and max values from the height field.

The minimum height value to map into the color ramp.

The maximum height value to map into the color ramp.

Maps height values in the height field (from Min elevation to Max elevation) into a color ramp to control coloring of the 3D height surface.