Semantic Lidar Does Not Detect Some Objects

[GoodarzMehr]

Setup

• CARLA version: custom 0.9.16 (ue4-dev fork circa November 2025)
• Platform: Ubuntu 22.04
• Python version: 3.10.12
• GPU: 2x RTX 4090s
• GPU Drivers: 580.95.05

Describe the bug
The semantic lidar cannot detect road lines in Town01, Town02, and Town03. It also does not detect parked Charger police cars in Town03 (in the image below they should be behind the barriers but are not visible). I think this problem extends to the regular lidar as well, at least for the police cars, it's hard to verify it for the road lines.

Screenshots

[Blyron]

That happens because some object do not have the block check on the physics query settings. We will note this

[GoodarzMehr]

Could you let me know what to change? I tried changing the collision preset from 'Ignore' to 'Block All' and 'Custom' but neither seemed to be working.

[Blyron]

The collision preset should be at custom, then en individual channels I would set everything to block all. Right now I am not working at this version of CARLA so I cannot be very precise

[GoodarzMehr]

I'm using the settings below, but it doesn't seem to have any effect. Is there anything here I need to change?

[Blyron]

Road markers now should be detected, try to use radar; LIDAR is almost horizontal is difficult to trigger them

[GoodarzMehr]

Sorry, but I'm not sure I follow. I want to detect them with the semantic lidar.

[Blyron]

Since LiDAR rays are predominantly cast horizontally, semantic validation of lane markings is difficult. This can be mitigated through proper configuration. Additionally, ensure that the mesh container folder is placed in the correct location within the project structure.

[GoodarzMehr]

Thanks for the info. I double checked and the lane markings for Town03 are under RoadLine, so the label shouldn't be problem. The semantic lidar that I'm using has 128 beams and the vertical FoV is -30 to +10, so it should be able to pick up road lines (in the image in the first post it shows the arrows).

This is a bit strange, I feel like something is missing but can't put my finger on it.