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Affecting Weightmaps

Brushes have the capability to influence multiple weightmaps simultaneously based on input textures like splatmaps. The values read from these textures can be modified in a manner similar to how you would transform input heightmaps.

Visualizing Changes​

Our built-in visualization tool allows you to preview changes made to weightmaps easily.

This tool provides functionality similar to the weightmap usage views available in Unreal Engine's landscape editor.

How to Access​

  1. Navigate to Visualize -> Preview.
  2. Choose Weightmaps under Preview Mode.

Limitations and Best Practices​

Understanding Layer Limitations​

When working with weightmaps and Edit Layers, it's essential to understand the limitations:

  • Layers can only either add or subtract values in their respective modes, but they cannot do both simultaneously.
  • Maintaining the weight-blended property—where all weightmaps sum up to a value of one—is challenging when painting on multiple layers.

Example​

If you've painted a Grass weightmap on one layer and then proceed to paint a Forest weightmap on a layer above it, the new painting will not negate the existing Grass weightmap. This could result in inaccurate values for material nodes that rely on weight-blended properties, such as the LandscapeLayersBlend node.

Recommendations​

To mitigate these limitations:

  • Perform all your weightmap painting on a single layer.
  • Alternatively, use non-weightblended weightmaps.

Clearing Weightmap Values​

You can reset the weightmap values by following these steps:

  1. Right-click on the respective layer.
  2. Navigate to Clear -> Paint.
  3. Choose either All to clear all weightmaps or select an individual weightmap to clear.

Image showing clearing weightmaps on landscape layer