Get location or bounds of tileset

JeroenTekle · July 4, 2023, 2:22pm

My users are able to add a 3DTileset by url, I want to be able to zoom to the new tileset. I can’t find a way to get latitude/longitude for a tile or the bounds defined by the tileset.

Kevin_Ring · July 5, 2023, 12:08am

Here’s how it’s done when you double-click a tileset in the Editor. You should be able to repurpose this code to move a Pawn at runtime.

github.com

CesiumGS/cesium-unreal/blob/6470529cebe0709beb3af881c8d570142c5d3f14/Source/CesiumRuntime/Private/Cesium3DTileset.cpp#L427


      
            this->_captureMovieMode = false;
            this->PreloadAncestors = this->_beforeMoviePreloadAncestors;
            this->PreloadSiblings = this->_beforeMoviePreloadSiblings;
            this->LoadingDescendantLimit = this->_beforeMovieLoadingDescendantLimit;
            this->UseLodTransitions = this->_beforeMovieUseLodTransitions;
          }
          
          void ACesium3DTileset::PauseMovieSequencer() { this->StopMovieSequencer(); }
          
          #if WITH_EDITOR
          void ACesium3DTileset::OnFocusEditorViewportOnThis() {
          
            UE_LOG(
                LogCesium,
                Verbose,
                TEXT("Called OnFocusEditorViewportOnThis on actor %s"),
                *this->GetName());
          
            struct CalculateECEFCameraPosition {
          
              const GeoTransforms& localGeoTransforms;

JeroenTekle · July 5, 2023, 8:43am

Thanks for the reply, however this is for Unreal, my question is specific to Unity. I believe this cannot be ported to Unity? ( I tagged my post as Cesium for Unity, should I also mention this in the title?)

I’ve now made a hacky version that parses the tileset.json file. The tilesets I’m currently testing with all come from disk and have a region bounding volume. This approach however is not very generic so it would be nice if there was a way to get the bounds of a Cesium3DTileset component.

Kevin_Ring · July 5, 2023, 9:49am

Oops, sorry about that, I thought I was reading a message in the Unreal forum for some reason! No need to mention it in the title or anything.

The equivalent code for Unity is here:

github.com

CesiumGS/cesium-unity/blob/69711b3b435e08515bfcec9ef35a4825792e2c20/native~/Runtime/src/Cesium3DTilesetImpl.cpp#L267


      
              return (*this)(boundingRegionWithLooseFittingHeights.getBoundingRegion()
                                 .getBoundingBox());
            }
          
            glm::dvec3 operator()(const CesiumGeospatial::S2CellBoundingVolume& s2) {
              return (*this)(s2.computeBoundingRegion());
            }
          };
          } // namespace
          
          void Cesium3DTilesetImpl::FocusTileset(
              const DotNet::CesiumForUnity::Cesium3DTileset& tileset) {
          
          #if UNITY_EDITOR
            UnityEditor::SceneView lastActiveEditorView =
                UnityEditor::SceneView::lastActiveSceneView();
            if (!this->_pTileset || !this->_pTileset->getRootTile() ||
                lastActiveEditorView == nullptr) {
              return;
            }

But because it’s in C++, it’s not easy to use this outside of the Cesium for Unity plugin itself.

So the short version is that there’s no really a way to do this in Unity, currently. But one could be added, and we’d welcome a pull request to that effect. What I’d suggest is to take that FocusTileset method, and refactor it to separate the bits that get a suitable view from the parts that actually move the Editor camera. The “get the view” part will still need to be implemented in C++, but after the refactoring it will be usable at runtime and from C#.

JeroenTekle · July 5, 2023, 10:22am

Thanks for the clear answer.

I’ll have a look later to see if I can add this feature. I’ll be sure to create a PR for it then. Thanks for the pointer on where to get started for this.

One thing I’ve seen mentioned by a few others here and there is that currently a lot of the api is dependent on there being an obvious (main) camera. However in certain XR applications having a obvious main camera is not possible. In my case our application has multiple camera’s in the scene. Adding a extra single main camera can be a workaround however this creates more complexity and requires sketchy workarounds to not cause rendering overhead from this new camera. Overall it would be nice if api’s exposed a bit more of the low level code like setting view frustum for loading, or getting the bounds of a tile.

I’m not sure if this is the correct place for this feedback. Besides this thanks for the help and overall nice plugin!

Kevin_Ring · July 5, 2023, 11:37am

That’s for the feedback. Better camera support is definitely on the list. The issue to track it is here:

github.com/CesiumGS/cesium-unity

Add support for multiple cameras

opened 04:31AM - 01 Jun 23 UTC

kring

enhancement

Currently, Cesium for Unity _exclusively_ uses [Camera.main](https://docs.unity3…d.com/ScriptReference/Camera-main.html) for tile selection. We need to provide users with a way to add more cameras when needed. Something like Cesium for Unreal's CameraManager is a good catch-all, but there are probably some easier/automatic things we can do as well, such as collecting all cameras tagged `MainCamera`. Requested here: https://community.cesium.com/t/about-more-main-camera-in-unity/24433/4

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Get location or bounds of tileset

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