Resolved SkinnedMeshRenderer.localBounds runtime manipulation

Code (CSharp):

1.  
2. using UnityEngine;
3. [RequireComponent(typeof(SkinnedMeshRenderer))]
4. public class SkinnedMeshRendererSetup : MonoBehaviour
5. {
6.     void Start()
7.     {
8.         SkinnedMeshRenderer smr = GetComponent<SkinnedMeshRenderer>();
9.         Bounds bounds = smr.localBounds;
10.         //bounds.size = new Vector3(10f, 10f, 10f);
11.         //bounds.Expand(10f);
12.         //bounds.extents = new Vector3(10f, 10f, 10f);
13.         //bounds.SetMinMax(new Vector3(-10f, -10f, -10f), new Vector3(10f, 10f, 10f));
14.     }
15. }
16.  

I'm trying to change the size of a SkinnedMeshRenderer's Bounds.

I tried doing it in 4 (commented) diferent ways, none of them work.

Aparently an internal value does change, but I don't see this reflected in scene view's bounds, or on the inspector. What am I doing wrong?

 

In ten years using Unity I have actually never seen anything useful come out of getting any of the

bounds

properties on any of the renderers. It always ends up being not useful or it doesn't work or it works in a weird way, or it's incorrect in editor, or it messes up with two cameras, etc.

I always just set my own notion of whatever I need for "bounds," perhaps with a simple radius, or else an axis-aligned bounds check, and moved onto the next problem. What exactly do you want with these bounds?

 

I'm trying to fix an issue where SkinnedMeshRenderer objects marked with Update When Offscreen false, cull out of view while still within Game camera view. This is due to certain animations causing the actual object to detatch from the renderer's bounds. Once the camera stops seeing the bounds, the SkinnedMeshRenderer object can sometimes still be seen since it's detatched/slightly separated, resulting in popping in and out of view. I'm sure this is a common isue, I just can't find the answer to it.

idk if I made myself clear with the issue though, but basically, editing the bounds manually is not a solution, because I have many of these objects. So it came to actually editing it in runtime.

Other olutions I thought of:

- Making the camera account for a wider "angle" before culling objects out of view. But I do not believe this is an option.
- Trying to refresh the Bound's proportions. But aparently, this is only posible with a regular MeshRenderer through a MeshFilter.
- Editing all bounds manually (may resort to it if desperate, which I'm kinda nearing).

 

Uhm, you know that Bounds is a struct and therefore a value type? When you want to change the bounds of a Mesh or a Renderer, you have to set the bounds property to a Bounds value. In your code you only read the bounds of the renderer and then you manipulate the Bounds value but you never assign it back to the renderer.

I also have never manipulated the bounds of a renderer, however I have changed the bounds of the rendered mesh in the past. So you should be able to do:

Code (CSharp):

1. SkinnedMeshRenderer smr = GetComponent<SkinnedMeshRenderer>();
2. Bounds bounds = smr.localBounds;
3. bounds.Expand(10f);
4. smr.localBounds = bounds;

This would increas the original bounds by 10 units in each direction.