OnBeforeCompileUniforms.jsx

  const uniforms = useRef(null)

  useFrame(({ clock }) => {
    if (!uniforms.current) return
    uniforms.current.u_color.value.y = Math.sin(clock.elapsedTime * 2)
  })

  return (
    <mesh geometry={Suz.nodes.geometry}>
      <meshNormalMaterial
        onBeforeCompile={(shader) => {
          shader.uniforms.u_color = { value: new Vector3(0.2, 0, 0.02) }
          shader.fragmentShader = 'uniform vec3 u_color;\n' + shader.fragmentShader
          shader.fragmentShader = shader.fragmentShader.replace(' normal ', ' normal * u_color')

          uniforms.current = shader.uniforms
        }}
      />
    </mesh>
  )