Properties
background
background: Color | Texture
backside
backside: boolean
fbo
fbo: WebGLRenderTarget<Texture>
fboBack
fboBack: WebGLRenderTarget<Texture>
material
material: ShaderMaterial
oldBg
oldBg: Color | Texture
parent
parent: Mesh<BufferGeometry<NormalBufferAttributes>, Material | Material[], Object3DEventMap>
Reference: https://blog.maximeheckel.com/posts/refraction-dispersion-and-other-shader-light-effects/