Radar Example Not Working In standalone_example/.../rtx_radar.py

Omniverse Isaac Sim
1

Isaac Sim Version

5.1.0

Operating System

Ubuntu 22.04

GPU Information

  • Model: NVIDIA GeForce RTX 3090
  • Driver Version: 570.190

Topic Description

Detailed Description

while running rtx_radar.py , the script is crashing with an error mentioned below :

2025-11-17T12:27:52Z [45,970ms] [Fatal] [omni.sensors.nv.radar.wpm_dmatapprox.plugin] Running radar without MotionBVH is disallowed, to force it use --/app/sensors/nv/radar/runWithoutMBVH=true
If you are running on Windows and have motionBVH enabled, be sure to enable Vulkan as well by passing --vulkan

Error Messages

Screenshot from 2025-11-17 18-25-46

2

@shani.rathod i am just another user, but does your setup include multiple GPUs? also, have you tried to enable motionbvh as suggested in the console report? here’s a bit more info on how to do so via the official doc:

3

Thanks @Simplychenable . By enabling {“enable_motion_bvh”: True} the rtx_radar.py script is run successfully but after a minute the IsaacSim app crashed. I tried so many times but when i tried to change values of sensor in isaacsim , it crashes every time.

4

does it crash with the same error? if not, could you upload the latest log info to allow the mods/devs to look into?

5

Screenshot from 2025-11-18 11-23-57
Screenshot from 2025-11-18 11-23-571841×949 333 KB

this is what i am getting every time crash report.
@Simplychenable

7

Hi @shani.rathod sorry for my late reply.

Regarding the initial MotionBVH error Please refer to our tutorial RTX Sensors — Motion BVH (RTX Sensors — Isaac Sim Documentation) as mentioned by @Simplychenable

Regarding the crash after ~1 minute when modifying sensor values — a few things to check:

  1. VRAM pressure: MotionBVH significantly increases VRAM usage. The full warehouse scene + radar + MotionBVH on an RTX 3090 may be pushing VRAM limits. You can monitor this with nvidia-smi dmon while running the script. Try with a simpler scene first (e.g., simple_room.usd instead of full_warehouse.usd) to see if the crash still occurs.
  2. Crash logs: Could you share the full Kit log file from the crash? It’s usually located at:
  ~/.nvidia-omniverse/logs/Kit/Isaac-Sim Full/5.1/

The .log file from the crash session would help identify whether this is a VRAM OOM, a segfault in the radar plugin, or something else.

  1. Runtime parameter changes: Are you modifying the radar parameters through the GUI property panel, or programmatically? If programmatically, are you doing it while simulation is playing? Modifying sensor prim attributes mid-render can sometimes cause instability — try stopping simulation, changing parameters, then restarting.
8

Hello!

We noticed that this topic hasn’t received any recent updates from anyone reporting this issue, so we are closing it for now to help keep the forum organized.

If you are still experiencing this issue or have related questions, please create a GitHub Discussion or Issue in the Isaac Sim repository and include a link to this topic along with updated details. Mentioning or linking to this original topic provides helpful context and makes it easier for others to assist you.

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The NVIDIA Isaac Sim Forum Team