What is avatarlightmodifier?

AvatarLightModifier is a small tool for VRChat, the social virtual reality platform where people interact using customizable 3D avatars. Its README is very short and written entirely in Japanese, describing a single specific feature rather than a general purpose application. The tool lets the person viewing an avatar, rather than the avatar's owner, adjust how bright that avatar appears to them. It is built as an add-on module for ShaderCore-family shaders, which are the rendering scripts that control how an avatar's surface and lighting look inside VRChat. It is distributed through VPM, the VRChat Creator Companion package manager, using a separate linked repository for installation. According to the README, using it involves three steps: turning on the relevant module inside a ShaderCore-based shader, adding a specific prefab file called AvatarLightModifier into the avatar's project, and then enabling AvatarLightModifier from an in-game VRChat menu, where a parameter can be adjusted to change the avatar's overall brightness as seen by the viewer. The README does not go into further detail beyond these setup steps. It does not describe the underlying shader logic, list any additional configuration options, or state a license, so those aspects remain unknown from the available documentation. This is a narrowly scoped utility meant to be dropped into an existing VRChat avatar project rather than used as a standalone application.