Irregular lighting effect on Special Mesh parts

[aeroware (hozz)]

Having recently used the Legacy and Voxel lighting system in-game, the majority of Special Mesh parts have experienced irregular lighting onto their surfaces with decals on top. Now, most parts get a strange appearance;

…as opposed to the original appearance of the object with the exact same properties of the lighting system roughly a week or two ago:

For anyone curious, here are the lighting properties:

Just for clarification, the object has a regular decal on it, and the object also has the child “SpecialMesh” inside it (the FileID one.)

There is also a strange bright anomaly on the part; I’m going to assume it’s where the sunlight is most reflective:

(Voxel)

(Legacy)

[filiptibell]

It looks like you have a Humanoid somewhere where you shouldn’t have one. Humanoids change the appearance of textures and meshes as well as making shadows more detailed (but at the cost of performance). The bright spot also looks like a bug with Humanoid shadows that I’ve seen before. Make sure to check any models your plane is in, and the workspace, for humanoids.

[Veldaren]

To add onto that, make sure the Humanoid is applying to all necessary parts, i.e. the Humanoid is a direct child of the plane’s entire model. If some parts are out of Humanoid’s directory, you’ll get such shadow issues.