Trouble exporting and loading custom RoadRunner maps in CARLA 0.9.15 (world loads empty)

[hungrystork]

Hi everyone,

I’m trying to create custom maps for CARLA 0.9.15 using RoadRunner and Unreal Engine, but I’m running into problems when packaging and loading them.

Here’s my workflow so far:

1. I build maps in RoadRunner.
2. I export them as UDatasmith, following MathWorks’ guide
3. I built CARLA from source (0.9.15) on Windows 11.
4. I can load the map in Unreal Engine, start it, and run scripts like manual_control.py without issues.
5. I tried exporting the map as a package using the steps in the CARLA docs

My .package.json looks like this:

{
    "props": [],
    "maps": [
        {
            "name": "test_road_1",
            "path": "/Game/Carla/CustomMaps/test_road_1",
            "use_carla_materials": true
        }
    ]
}

When I run make package ARGS="--packages=exportTestRoad1", I get some shader errors, for example:
error X4510: maximum ps_5_0 sampler register index (16) exceeded
(Full log-files are attached)

Despite the errors, a .zip file is created.

On another PC with a packaged version of CARLA, I copy the exported map into Import and load it, but the world is completely empty — no roads or environment show up.

My questions:

Has anyone run into the “sampler register index exceeded” errors during packaging? Could this be why the world loads empty?

Is there something wrong in my .package.json configuration?

Are there extra steps needed when exporting RoadRunner → UDatasmith → CARLA package on Windows?

Any help would be greatly appreciated!

exportTestRoad1.Package.json
CarlaUE4.log
CarlaUE4-backup-2025.09.17-11.52.32.log
CarlaUE4-backup-2025.09.17-11.53.39.log
CarlaUE4-backup-2025.09.17-11.54.03.log