Disable collider automaticly for lodgroups?

Questions & Answers
1

Can I have the collider for lower detail meshes in a lodgroup have automaticly disable the mesh collider?

For example having a lodgroup with 3 meshes means there are 3 collider meshes in roughly the same space while I would only need 1.

This leads to alot of unexpected behavior like invisible walls caused by a lower lod model collider and also weird physics behavior in my ball physics game.

Like surfaces being slippery that aren’t that fix themselves if i disable a lod collider.

Having to go trough every model in my levels will take alot of time so i wonder if I can tell the fbx importer to have the lodgroups lower detail meshes have no collider.

2

LODGroups only seem to be able to work on renderers in Unity3d. A workaround is to attach a script to the parent gameobject that will disable all child colliders by name at startup. Here’s a sample method you can use to achieve it:

private void DisableCollidersRecursive<T>(string nameMatcher = null) where T : Collider
{
    Regex matcher = string.IsNullOrEmpty(nameMatcher) ? null : new Regex(nameMatcher);

    foreach (var collider in gameObject.GetComponentsInChildren<T>())
        if (matcher == null || matcher.IsMatch(collider.gameObject.name))
            collider.enabled = false;
}

For instance you might set the input parameter as “.*_LOD1” to target only first level LODs.

3

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class OnLod0 : MonoBehaviour
{

[SerializeField]
Collider collider;

[SerializeField]
GameObject lod0Object;

[SerializeField]
Renderer renderer;

private void Awake()
{
    renderer = lod0Object.GetComponent<MeshRenderer>();
}

// Update is called once per frame
void Update()
{

    if (!renderer.isVisible)
    {
        if (collider.enabled)
        {
            collider.enabled = false;
            Debug.Log("disabled collider");

        }

        return;
    }else if (renderer.isVisible)
    {
        if (!collider.enabled)
        {
            collider.enabled = true;
            Debug.Log("enabled collider");
        }

        return;
    }

}

}