Studio and Graph › Voxel

Modification

Operations that reshape an existing field, such as offsetting or thickening its surface.

Studio and Graph › Voxel › Modification

Erosion

Slope-weighted fractal noise laid over a shape you already have. Rough highlights along cliffs and ridges, flat ground left mostly alone.

When to use it

Slope-weighted fractal noise laid over a shape you already have. Rough highlights along cliffs and ridges, flat ground left mostly alone.

No water is involved and no valleys get carved. Hydraulic Erosion is the one that does that, at the cost of a full simulation on every compile. This is cheap enough to leave switched on while you work.

Save it for last. It roughens large forms. It cannot create them.

Pins

InputsOutputs

Pin	Type	Description
`Density`	Number	The shape you want roughed up.
`Strength`	Number	How much of the detail to add. Push it far and the surface breaks into noise instead of looking weathered.
`Scale`	Number	How big the bumps are.
`Seed`	Whole Number	Changes the pattern without changing anything else.
`Octaves`	Whole Number	How many layers of detail to pile on. Each one is finer than the last and costs a little more.
`Lacunarity`	Number	How much finer each layer gets.
`Gain`	Number	How much quieter each layer gets.
`SlopeWeight`	Number	How much the steep parts get over the flats. At 0 the detail lands evenly everywhere.
`SedimentCapacity`	Number	How much settles into the flat bits.

Pin	Type	Description
`Result`	Number	The same shape, roughed up.

Available in Mesh Morpher Graph and Mesh Morpher Studio.

Studio and Graph › Voxel › Modification

Hydraulic Erosion

Actual water erosion. At compile time it pulls a 2D heightmap out of the field above it, runs tens of thousands of simulated droplets down the slopes, and lets them carve valleys and drop sediment....

When to use it

Actual water erosion. At compile time it pulls a 2D heightmap out of the field above it, runs tens of thousands of simulated droplets down the slopes, and lets them carve valleys and drop sediment. At runtime the eroded heights get sampled back into the density.

Pins

InputsOutputs

Pin	Type	Description
`Density`	Number	The landscape to run water over. It has to be height-based, something like noise minus Position Z.

Pin	Type	Description
`Result`	Number	The same landscape with valleys cut into it and sediment left in the low spots.

Settings

Setting	Type	Description
`Resolution`	Whole number	How fine the grid the water runs on is. Higher picks up narrower valleys, and costs you compile time and memory for it.
`World Size`	Number	How much ground the simulation covers, in world units, square. Make it smaller than the area you are actually generating and everything past the edge comes out uneroded.
`World Center`	Vector 2D	Where that square sits in the world.
`Blend Margin`	Number	How far past the edge the eroded ground fades back into the ground you fed in. Set it to 0 and the two meet in a step, which the mesher renders as a tall vertical wall right around the perimeter. The default is a tenth of World Size; widen it if the join still shows.
`Num Droplets`	Whole number	How many droplets get released. Too few and you get scattered scratches instead of a connected drainage pattern. More of them means a longer compile.
`Max Droplet Lifetime`	Whole number	How far one droplet is allowed to travel before it gives up. Raise it for long rivers, lower it for short gullies near the peaks.
`Erosion Radius`	Whole number	How wide a track each droplet cuts, in grid cells. Wider gives you smooth valleys, narrow gives you sharp channels.
`Seed`	Whole number	Changes where the droplets start. Same seed, same rivers, every time.
`Inertia`	Number	How much a droplet keeps its heading instead of turning downhill. At 0 it hugs the steepest line and rivers come out kinked; near 1 it coasts straight across dips and barely carves anything.
`Sediment Capacity Factor`	Number	How much a fast droplet can carry. Raise it for deeper carving.
`Min Sediment Capacity`	Number	The floor on that capacity, so a droplet crawling across a flat does not dump everything it is holding in one spot.
`Erode Speed`	Number	How quickly ground is cut away when a droplet has room for more.
`Deposit Speed`	Number	How quickly a droplet lets go of what it is carrying once it is overloaded.
`Evaporate Speed`	Number	How fast a droplet dries up. Higher gives you short streams near the peaks; lower lets them run all the way to the bottom.
`Gravity`	Number	How hard the slope pulls. It sets how much speed a droplet picks up on the way down.
`Initial Water Volume`	Number	How much water each droplet starts with.
`Initial Speed`	Number	How fast each droplet is already moving when it lands.

Available in Mesh Morpher Graph and Mesh Morpher Studio.