Why does my Local Volume snap on instead of fade?

Blend Distance defaults to 0, meaning instant transition at the trigger boundary. Set Blend Distance to a few meters and the volume's Weight ramps from 0 outside the boundary to 1 inside, smoothly.

Does the collider need to be convex?

For Local Volumes, yes — non-convex Mesh Collider doesn't define an inside cleanly. Use BoxCollider, SphereCollider, or a convex MeshCollider for the bounds.

What's the right Priority?

Higher Priority wins where multiple volumes overlap. Set the local volume Priority above the global one (e.g. local 1, global 0). Without this, the global keeps winning even inside the trigger.

Fix: Unity Local Volume Blend Distance Popping at Trigger

Quick answer: Set the Local Volume’s Blend Distance to ~2–5 meters. Use a convex collider. Set Priority above the global volume. Volume Weight now ramps smoothly when entering and leaving the trigger.

Walk into a cave volume. Color grading slams to the dark preset in one frame. Players notice the cut. Blend Distance gives the system room to interpolate.

The Symptom

Local Volume effects (color grade, fog, exposure) snap on/off at the trigger boundary. No transition.

The Fix

Volume (Local):
  Mode:            Local
  Blend Distance:  3.0     // meters of falloff outside the trigger
  Weight:          1.0
  Priority:        1      // above global = 0
  Profile:         CavePostFX

The volume’s contribution ramps from 0 (Blend Distance away) to 1 (inside the collider). Smooth blend.

Convex Collider

Add a BoxCollider, SphereCollider, or convex MeshCollider sized to the trigger region. Tick Is Trigger. Non-convex Mesh Colliders have no defined “inside” for volumes.

Priority Setup

Global volume Priority = 0. Local Volume Priority = 1+. Where they overlap, the higher Priority wins. Without this, the global may dominate even inside the trigger.

Verifying

Walk slowly across the boundary. Color grade should transition over the Blend Distance. Use Window → Analysis → Rendering Debugger → Volume to see live Weight values.

“Blend Distance for the falloff. Convex collider. Priority above global. Smooth.”

Related Issues

For Volume not applying, see Volume not applying. For vignette ultrawide, see vignette.

Falloff distance. Convex bounds. Smooth fade.