So I want to try a little effect in a map, but my efforts so far have not worked. What I want to do is put the ghost prop next to a large reflective surface (in this case a window), and use a dedicated cubemap set to 256x256, to capture the image of the ghost prop. In game the prop would later be killed via an input so that when people enter the area they don't see the prop itself, only its reflection in the glass. The problem I'm having is that I never see the reflection of the ghost prop. I use a prop_dynamic which I simply kill the first time the door to the area is opened. This ensures that the prop is there when I build cubemaps. I have checked that the prop is not being accidentally killed before building cubemaps by noclipping into the room (to avoid triggering the kill command) then building them. Nothing I try seems to work, anyone got any suggestions as to how I might achieve this effect?