A project aiming to create a fast stream implementation in Unreal Engine.

1. Install Unreal Engine 5.8.1 and Visual Studio 2026 with C++ game-development support.
2. Checkout files from the repo (including LFS), right-click CSW.uproject, and select Generate Visual Studio project files.
3. Drop a CSWDevTest instance into a scene
4. Enter a map url to a .gzd map in the Map Urls property (there is a map provided in the download under /maps)
5. Enable GZ_INSTRUMENT_CODE in the CSWPlugin.Build.cs file if you want to measure performance
6. The map will load in Editor mode but performance is measured between play and stop
7. You will get output from the log when you filter on sender CSW

CSWPlugin exposes a UCSWScene component that connects Unreal to the CSW scene manager (GizmoSDK). Key responsibilities:

• Map streaming via MapUrls and the CSW command pipeline.
• Scene graph creation/destruction on the game thread (buffered from the manager).
• Coordinate conversion between geodetic, Gizmo, and UE space.
• Ground clamp request/response helpers (polling, event, and async BP node).

Common entry points:

• UCSWScene::RequestGroundClampPosition(...) + TryGetGroundClampResponse(...) (polling).
• UCSWScene::OnGroundClampResponse (event/callback).
• GroundClampAsync (Blueprint async node: UCSWGroundClampAsyncAction).

ACSWDevTest is a lightweight test actor (C++ + Blueprint friendly). It includes:

• Geodetic conversion test (forward + reverse).
• Ground clamp test (polling) and an async example helper.

You can create a lightweight DevTest in Blueprint by inheriting from ACSWDevTest:

1. Create a Blueprint class based on ACSWDevTest.
2. Place the Blueprint actor in your level.
3. Set bRunGeoTest, TestLatitude, TestLongitude, TestAltitude in Details.
4. Implement the Blueprint events:
   • OnGeoTestComplete(WorldPos, LatitudeDeg, LongitudeDeg, AltitudeMeters)
   • OnGeoTestFailed() (optional)

If you need coordinate conversion in Blueprint, call:

• GeodeticToWorldBP(...)
• WorldToGeodeticBP(...)

These wrappers use the current loaded map coordinate system and route through GizmoSDK -> UE transforms.

Polling example (built in):

• Set bRunGroundClampTest = true and the ground clamp fields.
• Implement:
  • OnGroundClampTestComplete(Result)
  • OnGroundClampTestFailed()

Async example (recommended for BP):

• Call RunGroundClampAsyncExample(TimeoutSeconds).
• Bind OnSuccess / OnFail on the returned async action node.

Minimal polling pattern:

const int32 RequestId = Scene->RequestGroundClampPosition(Lat, Lon, Height, WaitForData);
FCSWGroundClampResult Result;
if (Scene->TryGetGroundClampResponse(RequestId, Result))
{
    // Use Result.WorldPosition / WorldNormal / WorldUp / Altitude
}

Requests are asynchronous; do not block the game thread.

If you have questions you can email Anders Modén or send support question to GizmoSDK Support

This demo is based on a streaming technique developed at Saab. It is compatible with other stream formats but has a number of specific features.

You can see a demo here Video

And Work on some BUGS in UE 5.5 UE BUG Video