Created
April 23, 2024 08:38
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fit box collider to children
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// https://github.com/UnityCommunity/UnityLibrary/blob/master/Assets/Scripts/Editor/ContextMenu/BoxColliderFitChildren.cs | |
// Adjust Box Collider to fit child meshes inside | |
// Usage: You have empty parent transform, with child meshes inside, add box collider to parent then use this | |
// NOTE: Doesnt work if root transform is rotated | |
using UnityEngine; | |
using UnityEditor; | |
namespace UnityLibrary | |
{ | |
public class BoxColliderFitChildren : MonoBehaviour | |
{ | |
[MenuItem("CONTEXT/BoxCollider/Fit to Children")] | |
static void FixSize(MenuCommand command) | |
{ | |
BoxCollider col = (BoxCollider)command.context; | |
// record undo | |
Undo.RecordObject(col.transform, "Fit Box Collider To Children"); | |
// get child mesh bounds | |
var b = GetRecursiveMeshBounds(col.gameObject); | |
// set collider local center and size | |
col.center = col.transform.root.InverseTransformVector(b.center) - col.transform.position; | |
col.size = b.size; | |
} | |
public static Bounds GetRecursiveMeshBounds(GameObject go) | |
{ | |
var r = go.GetComponentsInChildren<Renderer>(); | |
if (r.Length > 0) | |
{ | |
var b = r[0].bounds; | |
for (int i = 1; i < r.Length; i++) | |
{ | |
b.Encapsulate(r[i].bounds); | |
} | |
return b; | |
} | |
else // TODO no renderers | |
{ | |
return new Bounds(Vector3.one, Vector3.one); | |
} | |
} | |
} | |
} |
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