Scene creation using Blender

[weirdooo-18]

Hey there!!
I was trying to create a scene using Blender and OSM. After exporting the scene to Sionna in .xml format, I am getting an error relating to Plane.ply. I have followed all the steps as per the scene creation tutorial, and the plane(ground) is also included in the scene. Can you please help me out with this?

Thank you.

[jhoydis]

Hi @weirdooo-18,

Could it be that you have only copied the .xml file from the export and not the folder called meshes which contains the .ply files?

[weirdooo-18]

The same error persists even if the meshes folder is uploaded along with the .xml file.

[jhoydis]

Hm, did you check that the meshes folder contains the file Plane.ply?
Which version of Blender and the Plugin are you using?

[merlinND]

Hello @weirdooo-18,

Someone recently had the same symptom, but it seems that re-doing the export and making sure to keep the meshes directory together with the XML file was enough to resolve the problem:
mitsuba-renderer/mitsuba-blender#93

[xslobo05]

Hello @weirdoo-18,

First of all, do not use Blender 4.0, use version 3.6.9. Version 4.0 did not work for me both on Win and Macos.

All objects must be type "Mesh" (triangle icon). The error you're getting is probably caused by this. To change the type, right click on the object -> Convert to -> Mesh.

Second, make sure when exporting to check box that says "Export IDs". Also don't forget to set axis correctly (Y forward, Z up).

Before loading the scene with load_scene() make sure the "meshes" folder is in the same directory as the XML file.

I hope that helps.

[merlinND]

Thanks a lot for sharing this advice @xslobo05, I hope these steps will work for @weirdooo-18.

[xslobo05]

No problem. I'm doing raytracing on custom scenes imported from Blender and ran into this at the beginning. I believe the .PLY file type is specific to Mesh. Also, the folder is called "meshes" so it makes sense.