PageTurnBookSpineEffect handle( shader );
handle.SetUniform( IS_BACK_IMAGE_VISIBLE_PROPERTY_NAME, -1.f );
handle.SetUniform( SHADOW_WIDTH_PROPERTY_NAME, DEFAULT_SHADOW_WIDTH );
PageTurnBookSpineEffect handle( shader );
handle.SetUniform( IS_BACK_IMAGE_VISIBLE_PROPERTY_NAME, -1.f );
handle.SetUniform( SHADOW_WIDTH_PROPERTY_NAME, DEFAULT_SHADOW_WIDTH );