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How can I Export Navigation Data?

Hello I am looking at the "ExportNavigationData(....)" method that is part of the FRecastNavMeshGenerator.

I was wondering what the difference is between bExportGeometry being true or false. While I realise what it actually does I was wonder which geometry it actually exports ? Is it collision geometry ?

                 const bool bExportGeometry = Element.Data.HasGeometry() && Element.ShouldUseGeometry(&DestNavMesh->NavDataConfig);
 
                 if (bExportGeometry && Element.Data.CollisionData.Num())
                 {
                     FRecastGeometryCache CachedGeometry(Element.Data.CollisionData.GetTypedData());
                     IndexBuffer.Reserve( IndexBuffer.Num() + (CachedGeometry.Header.NumFaces * 3 ));
                     CoordBuffer.Reserve( CoordBuffer.Num() + (CachedGeometry.Header.NumVerts * 3 ));
                     for (int32 i = 0; i < CachedGeometry.Header.NumFaces * 3; i++)
                     {
                         IndexBuffer.Add(CachedGeometry.Indices[i] + CoordBuffer.Num() / 3);
                     }
                     for (int32 i = 0; i < CachedGeometry.Header.NumVerts * 3; i++)
                     {
                         CoordBuffer.Add(CachedGeometry.Verts[i]);
                     }
                 }
                 else
                 {
                     const TArray<FAreaNavModifier>& AreaMods = Element.Data.Modifiers.GetAreas();
                     for (int32 i = 0; i < AreaMods.Num(); i++)
                     {
                         FAreaExportData ExportInfo;
                         ExportInfo.AreaId = NavData->GetAreaID(AreaMods[i].GetAreaClass());
 
                         if (AreaMods[i].GetShapeType() == ENavigationShapeType::Convex)
                         {
                             AreaMods[i].GetConvex(ExportInfo.Convex);
 
                             TArray<FVector> ConvexVerts;
                             GrowConvexHull(NavData->AgentRadius, ExportInfo.Convex.Points, ConvexVerts);
                             ExportInfo.Convex.MinZ -= NavData->CellHeight;
                             ExportInfo.Convex.MaxZ += NavData->CellHeight;
                             ExportInfo.Convex.Points = ConvexVerts;
 
                             AreaExport.Add(ExportInfo);
                         }
                     }
                 }

the final exported obj file size is quite substantially different.

I am investigating what is the best way for me to export the Navmesh data (I need to re-use it outside of unreal) and this method seems really well suited for my needs.

Further is there any progress/update on having streamed navmesh technology ? I am playing around with some landscape terrains and the navmesh generation only works for the terrain that sits around the world origin. If however I try to export the navmesh data just with the sub level loaded (so not going through the world composition, then the generatede navmesh is correct and i can at least export it, )

thanks Chrys

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asked Sep 15 '14 at 12:13 AM in C++ Programming

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Chrys
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