Disappearing 3d Models

1. I've noticed something that only occurs in the game and not in Ultimate Doom Builder or GZDoom Builder.
2. First, within DECORATE, for each ACTOR, one describes a box (radius/height), which can be solid or not, about the 0,0,0 of the model. The center of the box' bottom face is at 0,0,0. You will see this box in your Builder with whatever sprite attributed.
3. I usually make most 16 x 32, which makes a 32 x 32 box.
4. Now here is the problem I'm seeing. While playing the WAD, if the extent of the box (not visible in the game) moves out of frame, but portions of the model are still in frame, then the whole model disappears. If you bring the box area back in frame, the model returns.
5. I resolved the problem in some cases by making the box very large. I have a pipe snaking around the ceiling and had to make the box 384 x32 so that some of the box was always in frame no matter where in the room your were standing.
6. Is this something in GZDOOM and how it handles models? Problem exists for OBJ and M3 models.
2. First, within DECORATE, for each ACTOR, one describes a box (radius/height), which can be solid or not, about the 0,0,0 of the model. The center of the box' bottom face is at 0,0,0. You will see this box in your Builder with whatever sprite attributed.
3. I usually make most 16 x 32, which makes a 32 x 32 box.
4. Now here is the problem I'm seeing. While playing the WAD, if the extent of the box (not visible in the game) moves out of frame, but portions of the model are still in frame, then the whole model disappears. If you bring the box area back in frame, the model returns.
5. I resolved the problem in some cases by making the box very large. I have a pipe snaking around the ceiling and had to make the box 384 x32 so that some of the box was always in frame no matter where in the room your were standing.
6. Is this something in GZDOOM and how it handles models? Problem exists for OBJ and M3 models.