private void SetBgOpacity(float val)
{
if (backgroundElement == null)
{
return;
}
if (val > 1)
{
val = 1.0f;
}
if (val < 0)
{
val = 0;
}
MaterialPtr bgMaterial = backgroundElement.GetMaterial();
bgMaterial.GetBestTechnique().GetPass(0).GetTextureUnitState(0).SetAlphaOperation(LayerBlendOperationEx.LBX_SOURCE1, LayerBlendSource.LBS_MANUAL, LayerBlendSource.LBS_CURRENT, val);
//alpha_op_ex source1 src_manual src_current 0.3
messageBgOverlay.Show();
}