Gridmaps with GPU particle collision

MikeCL

Hi all!

I'm having some difficulties with gridmaps and GPU particles.

Using regular collision shapes and meshes works as expected with the MeshLib, no issues there. But I can't seem to get it to work with GPUParticle collisions. Doesn't Gridmap/MeshLib support this?

Does anyone know if this is supported? If not, any good workaround for this?

I'm still on Godot 4.1 and haven't upgraded yet.

xyz

MikeCL GUP particles won't collide with regular collision shapes. You need to use special particle colliders. Take a look here for details.

MikeCL

xyz Ah yes.. I know that. I meant that it doesn't seem that the GPUParticlesCollision nodes play well (sorry, I wasn't clear on that in my post), including them in the MeshLib for the Gridmap. And I can't find anything mentioned about it in the documents.

xyz

MikeCL I haven't tried it. If it really doesn't work you can always resort to writing a script that'll look into library meshes for colliders and re-create them as plain nodes over the grid map.

Megalomaniak

MikeCL If this is an issue for you I think it's worth bringing to core developers attention as an issue report, even if they don't consider it to be a bug. With enough user feedback on this they might consider reevaluating the importance on this. Without such feedback however they might just keep thinking it a non-issue...

MikeCL

xyz That's an interesting approach, thanks! I will dig into that, and see if that would work.

MikeCL

Megalomaniak I agree... I just wanted to see if I was missing something by not knowing it well enough.

MikeCL

So, just an update on this. I learned that the way to go is to use GPUParticlesCollisionSDF3D. The problem is that it needs to be baked, and I can't do that through a script (which I need due to the procedural level system).

Another solution would be to use GPUParticlesCollisionHeightField3D. This is what I ended up using for now. It works great for having particles colliding with the floor. But it's not great if you want particles to collide with walls etc.

I did open up a Github issue on this regarding the gridMap. Github issue

But as I learned, I think my issue would be solved if I could bake GPUParticlesCollisionSDF3D during runtime.