Dealing with Banding in DirectionalLight

The banding effect you're seeing with your DirectionalLight is a common issue in 3D rendering, often related to shadow mapping resolution and quality settings. While the specific context doesn't provide detailed information about this particular issue, I can suggest several approaches that might help reduce or eliminate these bands:

1. Increase shadow map resolution - Higher resolution shadow maps can reduce banding:

   JAVASCRIPTCopied
   directionalLight.shadow.mapSize.width = 2048;  // Default is often 512
   directionalLight.shadow.mapSize.height = 2048;

2. Adjust the shadow bias - Tweaking the bias can help with shadow artifacts:

   JAVASCRIPTCopied
   directionalLight.shadow.bias = -0.0001;  // Experiment with small negative values

3. Use PCF (Percentage Closer Filtering) - This can soften shadow edges:

   JAVASCRIPTCopied
   directionalLight.shadow.normalBias = 0.05;  // Helps with surface acne

4. Adjust the camera frustum - Make sure your light's shadow camera is properly configured:

   JAVASCRIPTCopied
   directionalLight.shadow.camera.near = 0.5;
   directionalLight.shadow.camera.far = 500;
   directionalLight.shadow.camera.left = -100;
   directionalLight.shadow.camera.right = 100;
   directionalLight.shadow.camera.top = 100;
   directionalLight.shadow.camera.bottom = -100;

5. Enable shadow map blurring - If available in your version:

   JAVASCRIPTCopied
   renderer.shadowMap.type = THREE.PCFSoftShadowMap;  // Softer shadows

6. Consider using multiple lights - Sometimes combining different light types (like adding an AmbientLight) can help mask banding issues.

7. Check your material settings - Ensure your ground material has appropriate settings for receiving shadows.

Try these adjustments to see which combination works best for your specific scene setup.