This paper explores the technical implementation and artistic advantages of (also known as Height Fog) within modern game engines like Unity and Unreal Engine .
While visually rich, fog can be expensive. Optimization strategies include:
Uses textures or procedural noise to create a "wavy" or "fluffy" cloud effect rather than a flat gradient. Download File Advanced Vertical Fog Height Fog ...
Calculates fog density by sampling the Depth Texture to reconstruct world-space positions and applying a vertical gradient.
Popular assets like the Advanced Vertical Fog Shader in the Unity Asset Store or Unreal's Exponential Height Fog provide several "Advanced" features: Calculates fog density by sampling the Depth Texture
Standard distance-based fog often creates a "thick air" effect that lacks natural grounding. (Height Fog) solves this by using the world-space Y (or Z) coordinate to modulate density. This allows artists to fill valleys with dense mist while keeping peaks clear, a technique vital for open-world games and cinematic environments. 2. Technical Implementation Advanced fog systems typically use one of two methods:
Using smoothstep(LowerHeight, UpperHeight, currentY) to create an inverse lerp that defines where the fog begins and ends. 3. Core Features of "Advanced" Fog Assets This allows artists to fill valleys with dense
Allows different colors for the lower and upper fog layers to simulate sunrise/sunset lighting. 4. Performance Considerations