Gaea Documentation
The documentation is being updated for version 1.3. Some sections may be incomplete.

Thermal simulates Thermal Erosion that can create talus and debris.

Using Thermal Erosion

Selective Processing

Like with the Erosion node, you can modulate how

Thermal Stress Anisotropy

Thermal Stress Anisotropy governs how erosion and the resulting rocks deposits are shaped. It smooths the terrain while eroding. Low values keep the original terrain intact for the most part, while high values create stronger talus at the expense of eroding the original terrain. For example, sharp peaks get eroded heavily with high stress values.

The image below shows a simplified version of how Thermal Stress Anisotropy affects a terrain.

Combining with Hydraulic Erosion

In the real world, hydraulic and thermal erosion occur together. You can mimic this behavior by chaining Thermal and Erosion (or Wizard) nodes, as shown in the Layering Erosion section in Eroding Terrains.

Chained sequence of Wizard/Erosion and Thermal nodes

Selective Processing can be a very powerful tool in such a chain of nodes, for both Thermal and Erosion.


Thermal Erosion

Duration Duration of the thermal erosion process.
Strength Strength of the thermal erosion process.
Anisotropy Thermal erosion's anisotropy that affects how rock is affected, and deposits formed. See the Anisotropy section for details.
Talus Angle Angle of the talus (deposits).
Talus Settling Settling of sediments in the talus.
Sediment Removal Amount of sediment to be removed.
Fine DetailEnable rocky debris in the talus.
Debris Size Size of the rocky debris in the talus. Available when Fine Detail is turned On


Real ScaleUse the scale defined in the terrain. Disable to access addtional options and modify erosion's physics.
Terrain Scale Scale of the terrain. Available when Real Scale is turned Off
Feature Scale Scale of the largest feature in the terrain.
Verticality Height of the terrain.Available when Real Scale is turned Off
Stratify Wizard