I have a gltf error report:
ACCESSOR_VECTOR3_NON_UNIT
Vector3 at accessor indices 519..521 is not of unit length: 1.6477635560178159.
/meshes/0/primitives/0/attributes/NORMAL
And the value of Vector3 519…521 is -0.0571990832686424,0.996026694774628,0.0682575702667236.
I don’t see a question, but I think you also posted this on GitHub, so I think you are asking what this means.
Every vector3 for the normal mesh attribute are expected to be normalized (i.e. unit length, i.e. the length of the vector is 1).
The meshes section of the specification says this:
The error in the report is saying that this vector is not length of 1.
So how do you fix it. I have the same problem.
This is a validator hint that your model has invalid vertex normals, which may indicate a deeper problem with the model or the modeling workflow, such as degenerate triangles.
If the model appears the way you expect, you might be able to safely ignore the issue. If the model has visible lighting issues or dark faces, or you just want to ensure you’re producing a high-quality model, you may need to repair the mesh. Blender has tools for this like Degenerate Dissolve and Recalculate Normals.
