function instanceMesh(mesh) {
            return new Mesh({
                name: mesh.name,
                geometry: mesh.geometry,
                material: mesh.material,
                culling: mesh.culling,
                mode: mesh.mode
            });
        }
The scalar multiplier applied to each normal vector of the normal texture.

@type {number}

XXX This value is ignored if `materialInfo.normalTexture` is not specified.