What comes out for each value that goes in

Absolute Density

Returns the absolute magnitude of a density.

density.abs

What it does

Turn winding noise into ridges by folding its negative values upwards. Values near zero stay low, so the lines where the noise changes sign become narrow troughs.

Try 3D noise in Input, then lower the result with Offset. Combine it with your terrain through Minimum to open passages along those troughs.

Shape

What comes out for each value that goes in, computed by the real engine. Above the orange line is solid ground.

Input unchanged

On noise

The standard noise stretched to run from -1 to 1, before and after this node. First along one line, then seen from above.

The standard noise run through this node, rising from flat to full strength. Drag to look around.Noise from

Inputs and outputs

Name	Type	What it changes
Inputs
Input	Density	The density whose negative values you want to fold upwards.
Output
Output	Density	The input with every negative value made positive.

Good to know

Check the sign before carving

Keep the result negative where you want air. A positive offset closes the troughs instead of opening them.