Debugging terrapage plugin results: We've been seeing the same problem with a single camera moving around in the database.
Here's what I've been seeing: TXPNode::traverse -> this handles the unloading and loading of LOD 0 tiles. When loading a tile here's what I see: When the tile has no other lods, lod 0 node will be loaded (just a geode node) and attached to a PagedLod node under the TXPNode. So TXPNode -> PagedLOD -> geode When the tile has other lods, the lod 0 node will be loaded (TXPPagedLod), added to the activeLODList in the databasepager, and attached to the scenegraph. So it goes TxpNode -> PagedLod -> TXPPagedLod -> geode group -> (geode group, TXPSeamLOD) etc *Note that these nodes added to the activeLODList will never be expired by the databasepager, they will always be in the activelodlist unless you clear it out. [I'm assuming the difference is that the tile has other LODs and the other doesn't, haven't confirmed this. All I can confirm is that they are lod 0 nodes and their scene graph structures differ.] The Traverse also unloads the LOD 0 nodes (The PagedLOD nodes under the TXPNode). This works fine for the nodes that don't have any other LODs, but not so well for the Nodes that have other lods / seams. When the traverse removes a PagedLOD that has a TXPPagedLOD in it, the database pager never expires that node and never removes it form the active list. So it hangs around in memory never to be used again. When that same tile is reloaded, the newly loaded node is pushed onto the activeLODList and then added to the scenegraph by the database pager. So if you are constantly paging LOD 0 nodes in and out by moving around, you'll eventually run out of memory and crash. So what we are seeing is that duplicate LOD 0 nodes are being loaded. I currently don't have a fix for this, but would like to know what would be the preferred way of fixing this issue? The database version is Terrapage 2.2 I believe with 1600 LOD 0 nodes. Other LODs are present in certain areas. -Ryan S
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