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AutoBounds/Editor/AutoBounds.cs

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+using UnityEngine;
+using UnityEditor;
+
+//Made by Dreadrith#3238
+//Discord: https://discord.gg/ZsPfrGn
+//Github: https://github.com/Dreadrith/DreadScripts
+//Gumroad: https://gumroad.com/dreadrith
+//Ko-fi: https://ko-fi.com/dreadrith
+
+namespace DreadScripts.AutoBounds
+{
+    public class AutoBounds
+    {
+        private const float boundsPercentIncrease = 25;
+
+        //Sets bounds to auto-calculated dimensions starting from the target
+        [MenuItem("DreadTools/Utility/AutoBounds/Auto")]
+        private static void CalculateBounds()
+        {
+            //Get Selection
+            GameObject go = Selection.activeGameObject;
+            if (!go) return;
+
+            //Check for animator and to use hips instead of target as root
+            //Always using target as root may make the bounds follow improperly
+            Animator ani = go.GetComponent<Animator>();
+            bool isHuman = ani && ani.avatar && ani.isHuman;
+
+            Transform rootBone = isHuman ? ani.GetBoneTransform(HumanBodyBones.Hips) ?? go.transform : go.transform;
+
+            //Get child renderers including disabled
+            var renderers = go.GetComponentsInChildren<SkinnedMeshRenderer>(true);
+
+            //Get Max Extent by getting the biggest dimension
+            //Avatars can rotate their armature around meaning this dimension can go in any direction, so reuse it for every dimension
+            //Probably not the best logic or calculation but it usually works
+            float maxExtent = 0;
+            foreach (var r in renderers)
+            {
+                if (!r.sharedMesh) continue;
+                Transform currentRootBone = r.rootBone ?? r.transform;
+                var currentExtent = GetMaxAxis(rootBone.InverseTransformPoint(currentRootBone.position)) + GetMaxAxis(r.sharedMesh.bounds.size);
+                if (maxExtent < currentExtent) maxExtent = currentExtent;
+            }
+
+            //If human, hips should stay the center
+            //Otherwise, center the bounds vertically based on current dimensions
+            Vector3 center = new Vector3(0, isHuman ? 0 : maxExtent / 2, 0);
+
+            //Increase area by percentage for safe measure
+            maxExtent *= 1 + boundsPercentIncrease / 100;
+            Vector3 extents = new Vector3(maxExtent, maxExtent, maxExtent);
+
+            //Set auto calculated bounds starting from target as root
+            SetBounds(go.transform, rootBone, new Bounds(center, extents));
+        }
+
+
+        //Sets sampled bounds from target starting from top most parent of target
+        [MenuItem("DreadTools/Utility/AutoBounds/Sample")]
+        private static void SampleBounds()
+        {
+            //Get Selection
+            GameObject go = Selection.activeGameObject;
+            if (!go) return;
+
+            //Get renderer for sampling
+            SkinnedMeshRenderer sampleRenderer = go.GetComponent<SkinnedMeshRenderer>();
+            if (!sampleRenderer)
+            {
+                Debug.LogWarning("No skinned mesh renderer on selected gameobject.");
+                return;
+            }
+
+            //Set the samples bounds start from the top most parent
+            SetBounds(go.transform.root, sampleRenderer.rootBone, sampleRenderer.bounds);
+        }
+
+        //Sets all children skinned mesh renderers of the root to the given bounds
+        private static void SetBounds(Transform root, Transform rootbone, Bounds myBounds)
+        {
+            foreach (var r in root.GetComponentsInChildren<SkinnedMeshRenderer>(true))
+            {
+                r.rootBone = rootbone;
+                r.localBounds = myBounds;
+                EditorUtility.SetDirty(r);
+            }
+        }
+
+        private static float GetMaxAxis(Vector3 v) => Mathf.Max(v.x, v.y, v.z);
+    }
+}

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AutoBounds/Editor/AutoBoundsEditor.asmdef

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+    "name": "AutoBoundsEditor",
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+        "Editor"
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AutoBounds/How to use.txt

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+Made by Dreadrith#3238
+Discord: https://discord.gg/ZsPfrGn
+Github: https://github.com/Dreadrith/DreadScripts
+Gumroad: https://gumroad.com/dreadrith
+Ko-fi: https://ko-fi.com/dreadrith
+
+Menu items can be found in the top left corner of the Unity Editor window
+[DreadTools > Utility > AutoBounds]
+
+===========================================================================
+
+[Automatic]
+This will set all the skinned mesh renderers of the target to the same automatically calculated bounds and sets the hip/root bone as the target. 
+
+1- Select the root of your avatar.
+2- Press the menu item: [DreadTools > Utility > AutoBounds > Auto]
+
+============================================================================
+
+[Sample]
+This will set all the skinned mesh renderers that are children to the top most parent of the target to the same bounds and root bone as the target.
+
+1- Select the target that you want to sample from.
+2- Press the menu item: [DreadTools > Utility > AutoBounds > Sample]
+
+============================================================================

AutoBounds/How to use.txt.meta

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AutoBounds/LICENSE

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+MIT License
+
+Copyright (c) 2022 Dreadrith
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

AutoBounds/LICENSE.meta

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AutoBounds/README.md

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+# AutoBounds
+AutoBounds's purpose is to make easier to set the bounds of skinned mesh renderers so that they don't disappear in your peripherals especially when the avatar is not in a standing pose
+
+# How To Use
+Menu items can be found in the top left corner of the Unity Editor window
+[DreadTools > Utility > AutoBounds]
+
+## Automatic
+This will set all the skinned mesh renderers of the target to the same automatically calculated bounds and sets the hip/root bone as the target. 
+
+1- Select the root of your avatar.  
+2- Press the menu item: [DreadTools > Utility > AutoBounds > Auto]
+
+## Sample
+This will set all the skinned mesh renderers that are children to the top most parent of the target to the same bounds and root bone as the target.
+
+1- Select the target that you want to sample from.  
+2- Press the menu item: [DreadTools > Utility > AutoBounds > Sample]
+
+### Before
+[<img src="https://raw.githubusercontent.com/Dreadrith/AutoBounds/main/_media/Before.png">]()
+### After
+[<img src="https://raw.githubusercontent.com/Dreadrith/AutoBounds/main/_media/After.png">]()

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AutoBounds/package.json

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+{
+  "name": "com.dreadscripts.tool.autobounds",
+  "displayName": "AutoBounds",
+  "version": "1.0.0",
+  "unity": "2019.4",
+  "description": "Editor script to help setting the bounds of skinned mesh renderers.",
+  "keywords": [
+	"Dreadrith",
+	"DreadScripts",
+	"DreadTools",
+	"Editor",
+	"Utility",
+	"Renderers"
+  ],
+  "author": {
+    "name": "Dreadrith",
+    "email": "dreadscripts@gmail.com",
+    "url": "https://github.com/Dreadrith"
+  },
+  "legacyFolders": {
+    "Assets\\DreadScripts\\Utility\\Editor\\AutoBounds": "97d295ac00bde904b83106bff682f8b6"
+  }
+}

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