1. A RenderTexture is created to serve as the persistent visibility mask for the scene.
2. The RenderTexture is assigned to a RawImage component located on a Canvas set to Screen Space - Camera.
3. A custom Material using a subtraction or reveal shader is assigned to the RawImage to handle color and alpha blending.
4. Entity world positions are converted into normalized UV coordinates by mapping the Transform position to the defined map dimensions.
5. Normalized coordinates and the reveal radius are passed to your shader using Material.SetVector and Material.SetFloat.
6. Graphics.Blit is executed to update the RenderTexture, utilizing a temporary buffer to prevent sampling conflicts during the read-write process.

The system operates by continuously clearing or modifying alpha values on the RenderTexture at entity coordinates. By using this persistent buffer, revealed areas remain visible as the player explores the environment.

Additional Tips

• A lower resolution RenderTexture should be used to minimize GPU memory usage and naturally soften reveal edges.
• Bilinear filtering must be enabled on the RenderTexture settings to ensure smooth transitions between revealed and hidden areas.
• The Canvas sorting order should be configured to render above the game world but below the primary UI HUD elements.