N8AO ignores the EffectComposer camera and scene props #395

<N8AO> builds its N8AOPostPass from useThree()'s camera and scene instead of EffectComposerContext. When <EffectComposer camera={...} scene={...}> uses a camera or scene other than the canvas defaults, the composer renders depth from one camera while N8AO reconstructs positions with the other, so the ambient occlusion is misplaced. Changing the composer's camera prop does not update N8AO either.

Other effects (LensFlare, Outline, SelectiveBloom, GodRays, DepthOfField) and useDepthPicking already read the camera from EffectComposerContext.

Reproduction

const ref = createRef()
<EffectComposer camera={otherCamera} scene={otherScene}>
  <N8AO ref={ref} />
</EffectComposer>
// ref.current.camera is the default canvas camera, not otherCamera

Expected

N8AO uses the camera and scene that the EffectComposer renders with.

Version

@react-three/postprocessing 3.2.0 (current master).