Cesium for Unity Hololens2

whiteibescu · May 9, 2023, 5:05am

I tried building but I get error related with Reinterop. I am just wandering if I can build using Unity for Hololens2 without using Unreal. It says it can’t be found and the dlls I am trying to get access won’t give me any access.
I am aware Unreal Hololens2 is possible to build. Thank you.

Used Unity 2021.3.3f1, Cesium 1.0.1

Kevin_Ring · May 9, 2023, 6:11am

We haven’t tried building the plugin for the HoloLens2 itself, though tethered mode should work out of the box. It should be possible to run directly on the device, but it may not be straightforward. The general outline of the process can be found in the developer setup instructions:

github.com

CesiumGS/cesium-unity/blob/main/Documentation~/developer-setup.md

# Overview

This is a summary of the setup and workflows for developers who want to modify the Cesium for Unity plugin. If you just want to use Cesium for Unity in your own applications, see the main [README](../README.md).

## :computer: Building Cesium for Unity

### Prerequisites

* CMake v3.15 or later (the latest version is recommended)
* [.NET SDK v6.0 or later](https://dotnet.microsoft.com/en-us/download/dotnet/6.0)
* If you're using Visual Studio, you need Visual Studio 2022.
* Unity 2021.3+ (the latest version of the Unity 2021.3 LTS release is recommended)
* On Windows, support for long file paths must be enabled, or you are likely to see build errors. See [Maximum Path Length Limitation](https://learn.microsoft.com/en-us/windows/win32/fileio/maximum-file-path-limitation?tabs=registry#enable-long-paths-in-windows-10-version-1607-and-later).
* For best JPEG-decoding performance, you must have [nasm](https://www.nasm.us/) installed so that CMake can find it. Everything will work fine without it, just slower.

The built Cesium for Unity Assembly will run on much older versions of .NET, including the version of Mono included in Unity. However, these very recent versions are required for the C#<->C++ interop code generator (Reinterop).

To make sure things are set up correctly, open a command-prompt (PowerShell is a good choice on Windows) and run:

* `dotnet --version` and verify that it reports 6.0 or later

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But this will not work out of the box. You will definitely need to make some changes to support HoloLens2, and I don’t know what those changes are offhand.

whiteibescu · May 10, 2023, 7:20am

Thank you for your feedback.
Now I am trying to build it through Unreal because that is offical and I am trying to build AnywhereProjectXR with the recommended version 4.27 and I am having errors because I don’t have to exact source in the sources directory.
To clarify I am trying to package this so that I can build it on Hololens2.

PackagingResults: Error: Missing precompiled manifest for ‘CesiumRuntime’. This module was most likely not flagged for being included in a precompiled build - set ‘PrecompileForTargets = PrecompileTargetsType.Any;’ in CesiumRuntime.build.cs to override.
UATHelper: Packaging (HoloLens): BUILD FAILED
PackagingResults: Error: Unknown Error

Any clues on this?

Kevin_Ring · May 10, 2023, 9:14am

Cesium for Unreal is in the same situation as Cesium for Unity: only tethered HoloLens rendering is supported.