UE4.27 Runtime USD Import

Community Community & Industry Discussion
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1

Hello
I tried to use USD Stage Actor to import an USD file at runtime.
I used “Set Root Layer” node and it worked on PIE and Stand Alone but it did not work with packaged project.
But when I used that actor with “Spawn Actor from Class” it spawns and again, it does not work.

Is there any suggestion for it ?

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When you try to load usd in runtime with log enabled, there will be a error log :

*LogUsd: Error: The USD SDK is disabled because the executable is not forcing the ansi C allocator (you need to set ‘FORCE_ANSI_ALLOCATOR=1’ as a global definition on your project .Target.cs file). Read the comments at the end of UnrealUSDWrapper.Build.cs for more details.

Accordding to the error log, I add

BuildEnvironment =
TargetBuildEnvironment.Unique;
GlobalDefinitions.Add(“FORCE_ANSI_ALLOCATOR=1”);

Then, you should download your unreal engine from github.com and compile it by your own if you installed 4.27 from epic launcher, otherwise, you will meet another package error.

I gave up in this step because I decieded to switch to DatasmithRuntime to import scene in runtime for vray materials support.

Hope that helps.

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I helps a lot ! Thank you very much. I tried and got same errors. I wont try to compile engine because there are additional mechanics which I need to write. But I will try in the future.

I tried to use Datasmith Runtime but for CAD aspect, part names and hierarchy come broken. So I use GLTF Runtime.

4

I used your hints and right now I can successfully import USD files. Thank you !

5

Glad to hear that, have a good day friend.

6

Hey, Is it possible to import USD file in Packaged project If Yes can you tell me the steps to do that ???

Purpose :- I want to load all the assets in my game in runtime like i have a .CSV file that have all the data about location and rotation about the actor and the actor is in .USD format so I just want to read that .csv file and pick USD file From that location…

Thanks In Advance

7

Yes, it’s possible but you need to use source code version of Unreal Engine. Not client one.
After that just follow this steps.

Because client version of Unreal doesn’t support target.cs edits.

8

Has this been resolved in 5.0/5.1 using a launcher build to package? Would really like to be able to package using a launcher build but running into similar issues.

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I haven’t tried it yet and won’t try it near future. But you can try it. Just try to import something to a template and package it. If there will be an error after target.cs edit, we can say you need source code.