I’m just curious here, because I’m having some problems with display lists in my app.
Or at least I think its display lists.
It seems as if some of my display lists are disappearing.
I occasionally have to adjust in the models in my app, so all I do is go through and delete all the previous display lists and rerender new display lists.
Unfortunately I just implemented (fixed a broken feature) which utilizes a display list, and baboom, the main model’s display list disappears.
The strange thing here is that the display list group that contains the model also contains a few other objects, and they’re there. Help…
i’ve seen VERY VERY strange results from display lists ( the whole scene f***ed up), just because of giving some lists the same ID ( i didnt use EnumDisplayLists ).
maybe you swapped some of them…
Are you using nested display lists?
Because AFAIK, deleting a child list will invalidate the parent list, yet keep the other child lists intact. Even if you re-use the child list ID.
If this is the case, then you’d have to rebuild your parent list from scratch every time you deleted a child list.
Another possibility is that for some reason you can’t re-use an ID immediately. In other words, you delete list 3, then immediately recreate a list with ID 3 without checking it’s avaliability with glGenLists() or glIsList(). This is just a shot in the dark, so don’t take it as definite.
He Who Ususally Shoots Himself In The Foot When He Takes A Shot In The Dark.
Originally posted by JohnD:
[b]Are you using nested display lists?
Because AFAIK, deleting a child list will invalidate the parent list, yet keep the other child lists intact. Even if you re-use the child list ID.
If this is the case, then you’d have to rebuild your parent list from scratch every time you deleted a child list.
Another possibility is that for some reason you can’t re-use an ID immediately. In other words, you delete list 3, then immediately recreate a list with ID 3 without checking it’s avaliability with glGenLists() or glIsList(). This is just a shot in the dark, so don’t take it as definite.
He Who Ususally Shoots Himself In The Foot When He Takes A Shot In The Dark.
-JohnD[/b]
Just quoting the whole thing cause I’m lazy today. What I was doing was GenListing, then creating the lists, then when any list needed to be modified, all of the lists were deleted and re-gen’d. I was getting some strange behavior that way (disappearing lists).
I did fix it, as far as I can tell. Instead of deleting the lists every time, I initialize them (GenLists) at app startup, and then just overwrite them whenever a change needs to be made. No DeleteLists used until app cleanup. It seems to work fine, but any side effects haven’t been realized yet.
