Your assumption is correct. The light will not bend. This would require bryce to behave differently. If a light ray could currently do such a thing, when you shone it on a mirror in Bryce, you would see the light reflect off of the mirror...but it doesnt. To achieve the effect you are trying would require faking a light ray. apply a variation of the "green lit" preset material to cylinder, then where you wish the light to bend put a different cylinder and slight rotate/reposition it to fake the effect. Sorry thats all you can do currently BT