Backdrop 
The cientos package provides a <Backdrop /> component. It's just a curved plane, like a studio backdrop. Meant is for presentational purposes, to break up light and shadows more interestingly.
Usage 
vue
<Backdrop />
// Backdrop with a custom material
<Backdrop
  :floor="1.5"
  :segments="20"
  receive-shadow
>
    <TresMeshPhysicalMaterial color="orange" :roughness="1" />
</Backdrop>Props 
| Name | Type | Default | Required | 
|---|---|---|---|
| floor | number | 0.25 | No | 
| segments | number | 20 | No | 
| receiveShadow | boolean | false | No |