: Brushes that are non-convex or have zero-thickness faces, which the BSP compiler cannot process correctly.
: The physical structure of the environment, defined by brushes and vertices.
: Ensure all brushes are closed and convex.
: Calculations for light bounces and shadows across the surfaces. Troubleshooting Workflow
: Run the map through a clean BSP, VIS, and RAD pass to clear the anomaly panel.