Why doesn't toggling a Shader Graph Boolean Keyword change the visual?

Boolean Keywords are toggled via material.EnableKeyword(name) / DisableKeyword(name), not SetFloat alone. Both must be paired: SetFloat sets the property; EnableKeyword tells the shader compiler which variant to use.

Per-material toggle vs global?

Use Shader.EnableKeyword for global state. material.EnableKeyword for per-material. Don't mix; one will overwrite the other.

What about MaterialPropertyBlock?

MPB doesn't honor keywords (only float/vector/texture). If you need per-instance keyword variation, use multiple materials or Hybrid Renderer.

Fix: Shader Graph Toggle Keyword Stays Default

Quick answer: material.EnableKeyword("_FOG_ON") + material.SetFloat("_FogOn", 1f). Both lines required.

You drag the keyword toggle in the inspector, shader updates. From script via SetFloat alone, no change.

The Fix

void SetFog(bool on) {
    if (on) material.EnableKeyword("_FOG_ON");
    else   material.DisableKeyword("_FOG_ON");
    material.SetFloat("_FogOn", on ? 1f : 0f);
}

Keyword names match the Reference field on the Boolean Keyword in the Blackboard. SetFloat alone updates the property but not the chosen variant.

Verifying

Toggle from script. Variant swaps. Without EnableKeyword: shader stays on the default branch.

“EnableKeyword + SetFloat. Both. Variant flips.”

Related Issues

For Multi Compile vs Shader Feature, see keyword type. For variant stripping, see strip.

Two calls. Variant ships.