I've run an explosion and noticed that my ground plane does not extend to infinity. Things fall off below it.

I tried to debug it be deleting the ground plane and recreating it again. Same thing.

I then created a sphere and dropped it in the scene. As you can see from my image, it falls under the ground plane too. Only stuff that's dropped on the ground plane which is visible actually stays.

I'm sure it must be something simple I'm overlooking but I can't figure it out. If I open a new scene and create a new ground and drop a sphere, it stays on the ground no matter where I drop it.

Is there some setting that deals with the size of the ground plane? I thought it was infinite according to the docs.

Thanks

(PS: file too heavy to include with geo)

Your ground plane actually looks different than the default one. Did you create the ground plan using the shelf? The default ground plane should look like the attached image.

I wonder if you have a custom one overriding the default one. If you middle click on the groundplane DOP node, it should be defined by something like:
/opt/hfs14.0.408/houdini/otls/OPlibDop.hda?Dop/groundplane

Are you able to reproduce this in a new scene?

awong
Your ground plane actually looks different than the default one. Did you create the ground plan using the shelf? The default ground plane should look like the attached image.

I wonder if you have a custom one overriding the default one. If you middle click on the groundplane DOP node, it should be defined by something like:
/opt/hfs14.0.408/houdini/otls/OPlibDop.hda?Dop/groundplane

Are you able to reproduce this in a new scene?

Hi & thanks for trying to help.

Yes, the ground plane is the default Dop/groundplane otl. It looks that way because it's a shot from the ortho side view. See new screenshot with ‘wire shaded’ on from perspective.

As mentioned before, if I create a new scene and throw a ground plane down, it works. It just doesn't work in my scene.

Where does the ground plane define its size from?

Maybe I did something by mistake… although I can't see how that would be the case when deleting it and reinserting it doesn't work.

There's no parameter exposed on the groundplane asset to control infinity or not. As long as there isn't any local modifications, the groundplane should always be infinite. You can verify that by checking the node /obj/AutoDopNetwork/groundplane1/volume1. The “mode” should say “Implicit Plane”.

Are you able to strip down your scene and attach it? If you could get it down to only the groundplane and sphere, that might help debug the problem.

I traced my problem to my imported FBX file (exported from Maya). When I delete it, the ground plane works again.

I can strip down the scene and attach, but the problem is the huge fbx model, which would be stripped out.

How should I proceed?

That's really weird. I assume the FBX geometry is being used for some sort of collision? Does this only happen with that particular FBX model? If you import a simple FBX geometry, does it also break the groundplane? Instead of attaching the FBX file here, you could also submit a bug to support, and attach the file there.

Maybe another thing you can try is removing parts of the FBX geometry and see if there's a particular part that's causing this issue.