Don't clear the background
Clear the background with a skybox
Clear the background with a solid color. The alpha channel of the color determines the transparency
No declared background intent. Sets the render clear color to fully
transparent so the canvas shows through when nothing else is configured,
but leaves scene.background untouched — backgrounds set by other code
(custom loaders, user assignment) are preserved.
The ClearFlags enum is used to determine how the camera clears the background