Let’s break down what vrcfaceblendh actually is, why it matters, and how to use it without breaking your avatar. In simple terms: vrcfaceblendh is a float parameter that controls a custom facial BlendShape (morph target) on your avatar.
While VRChat provides built-in parameters for visemes ( vrc_viseme_* ) and eye tracking ( vrc_eyelid_* ), vrcfaceblendh is part of the custom expression pipeline. It allows you to drive specific BlendShapes directly from an animation or a gesture. vrcfaceblendh
At first glance, it looks like a typo. "Blendh"? Shouldn't it be "BlendShape"? But make no mistake—this parameter is one of the most powerful (and misunderstood) tools for high-fidelity facial expression management. Let’s break down what vrcfaceblendh actually is, why