Adding behavior to GLTF action with a box collider creates an error.

[shanewhitfield]

Adding a behavior to a GLTF actor with a box colliderType produces an error

Error: "App Behaviors will not function on Unity host apps without adding a collider to this actor first. Recommend adding a primitive collider to this actor."

[stevenvergenz]

glTF loading is asynchronous, so any operations you do on a glTF actor without waiting for it to load are going to be done in the dark. If you try to add a behavior immediately after starting the load, then this error is justified: that actor has no collider at the time of behavior initialization. It will work after the collider loads in, but throwing this warning is still desired behavior I think.

It's also worth noting that the collider argument to AssetContainer.loadGltf or Actor.CreateFromGltf has a different behavior than one might expect. It does not place a collider around the root glTF actor, but instead it places a collider of the specified shape on each child actor with a mesh.

[afarchy]

Sounds like there are two opportunities for improvement:

1. The error message should suggest a fix.
2. "It does not place a collider around the root glTF actor, but instead it places a collider of the specified shape on each child actor with a mesh." -- is this actually desired? What I actually want is a fitted box around the whole mesh.

[tombuMS]

@afarchy Which error message are you referring to? The one that exists for behaviors being set with no collider does have the suggested fix in the error.

[afarchy]

Yes, but it's the wrong suggestion, as stevenvergenz mentioned - what I should actually do is wait for the GLTF to load before setting the behavior.

[tombuMS]

The behavior system has no context on whether the actor is being loaded from a gltf, is an empty actorm primitive actor etc. This is why there is a general suggestion to add the collider. We could change to something like "Are you waiting until the actor is fully loaded? Does your actor have a collider on it?"

[silasalves]

I am trying the Hello World sample and I am getting the same error, even though the sample waits for the model to load.

What I noticed is:

1. When I add the script for the first time, it loads and works as expected.
2. After exiting the room and entering again, the behaviours won't work no matter how many times I reload it.
3. It will be fixed if i) I delete the object and add it again or ii) I change the Session ID. However, it will stop working again after exiting and entering the room again.

Is there any other way to load a model without running into this problem?