docs: remove flatshading update info

[sciecode]

Flat / smooth shading is baked into normals. You need to reset normals buffer (see above).

This information makes it seems like every material needs to reset normals buffer when updating flatShading parameter, this isn't true.

This would only apply MeshLambertMaterial, but even with geometry.normalsNeedUpdate = true flatShading isn't working correctly on this material.

[WestLangley]

but even with geometry.normalsNeedUpdate = true flatShading isn't working correctly on this material.

MeshLambertMaterial does not support the flatShading flag.

Instead, you need to bake flat vertex normals into your geometry:

geometry = new THREE.Geometry().fromBufferGeometry( geometry );

geometry.computeFlatVertexNormals();

geometry = new THREE.BufferGeometry().fromGeometry( geometry );

[sciecode]

@WestLangley thanks for clarifying.

Still, it makes sense to remove that information from the docs. Correct?

[WestLangley]

Probably. That document is ancient.

[mrdoob]

Thanks!