Performance Tips

intermediate performance

Dynamic Fog & Mist 2 (Built-in) · Troubleshooting & FAQ

Overview

Dynamic Fog & Mist 2 is already lightweight — it uses optimized shaders with minimal texture samples. These tips help you squeeze out extra frames on mobile or lower-end hardware.

Choose the Right Variant

The single most impactful optimization is selecting the correct fog effect type for your platform:

Target Platform	Recommended Variant	Reason
Desktop (PC/Mac)	Desktop Fog Plus + Sky Haze	Best visual quality with minimal desktop GPU cost.
Mid-range mobile	Mobile Fog + Sky Haze	Single noise texture, good quality/performance balance.
Low-end mobile	Mobile Fog (Simplified) or Basic	No noise textures — minimal GPU overhead.
Isometric/top-down	Orthogonal variants	Correct depth/height separation for non-standard perspectives.

Optimization Checklist

Optimization	Impact	Details
Use DynamicFogExclusive	High	The Exclusive variant includes a Downsampling parameter that renders fog at reduced resolution — significant speedup on mobile.
Use fog materials instead	High	Per-object fog materials avoid the full-screen blit entirely. Best option for old mobile devices.
Use FogOfWar prefab	High	For top-down fog of war, the mesh-based prefab is much faster than the image-effect approach.
Reduce fog-of-war texture size	Medium	Lower Texture Size in the fog-of-war settings. 256 is often sufficient for gameplay.
Disable sky haze	Medium	If you don't need atmospheric haze, pick a "No Sky Haze" variant to save a texture sample per pixel.
Remove unused shaders	Build size	Delete unused materials and shaders from `DynamicFog/Resources` to reduce build size and shader compile time.
Lower Quality in WebGL	Medium	Ensure Quality is set to Medium or higher in Project Settings > Quality to avoid rendering issues.

Profiling

Use Unity's Frame Debugger (Window > Analysis > Frame Debugger) to measure the cost of the DynamicFog pass. Look for the OnRenderImage or post-processing pass and compare its duration against your per-frame budget.

Mobile rule of thumb: On low-end mobile devices, use Mobile Fog (Basic) or fog materials. For mid-range devices, Mobile Fog + Sky Haze with downsampling via DynamicFogExclusive offers the best quality/performance ratio.

Next Steps

Fog Effect Types — detailed comparison of all shader variants.
Troubleshooting — resolve common rendering issues.

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