Using Surface Tool with Parallel.For Crashes

[ghost]

Godot version

4.0 release candidate 1

System information

Windows 10, Vulkan Rendering, Radeon RX 6600

Issue description

Hello,

Firstly thanks for this beautiful game engine. I switched from 3.5.1 to 4.0 and trying to use surface tool in a parallel for. In 3.5.1 i was successful using it for creating runtime meshes. However it seems to crash in 4.0. Also intersecting a ray in a thread throws errors in debug too. Is this intended or am i missing something? I have included a sample project.

Thanks in advance.

Steps to reproduce

Create a simple Node3D scene.
Add a Camera3D and a StaticBody3D in scene.
Attach a C# script to StaticBody3D.
Try to generate a mesh inside _Process function via a function using Surface Tool with Parallel.For

Minimal reproduction project

sample.zip

[Zireael07]

Neither physics nor OpenGL shaders are thread safe AFAIK

[Calinou]

See #56524 and #70325.

[ghost]

In case anyone wonders;
I slightly modified my code, moving surface tool out of any parallel or threads. However, reaching the stateSpace in parallel was still problematic, crashing the engine. I placed mutexes where necessarry. Problem seems to be solved.

Is there any way to make local copies of the stateSpace so that threads can use?