*
* When the page is turned over in landscape, call
* SetIsBackImageVisible(true), this effect can display the back image
*
* When the page is turned over in landscape, call
* SetIsBackImageVisible(true), this effect can display the back image
* display the pages visually consistent with its turning state,
* please set the uniforms with the same values as the PageTurnEffect.
*
* display the pages visually consistent with its turning state,
* please set the uniforms with the same values as the PageTurnEffect.
*