Merge branch 'Menotdan-boxcollider-autosize'

Source/Editor/SceneGraph/Actors/BoxColliderNode.cs

@@ -7,9 +7,37 @@ using Real = System.Single;
 #endif
 
 using FlaxEngine;
+using FlaxEditor.CustomEditors.Dedicated;
+using FlaxEditor.CustomEditors;
+using FlaxEditor.Scripting;
 
 namespace FlaxEditor.SceneGraph.Actors
 {
+    /// <summary>
+    /// Dedicated custom editor for BoxCollider objects.
+    /// </summary>
+    [CustomEditor(typeof(BoxCollider)), DefaultEditor]
+    public class BoxColliderEditor : ActorEditor
+    {
+        /// <inheritdoc />
+        public override void Initialize(LayoutElementsContainer layout)
+        {
+            base.Initialize(layout);
+
+            layout.Space(20f);
+            layout.Button("Resize to Fit", Editor.Instance.CodeDocs.GetTooltip(new ScriptMemberInfo(typeof(BoxCollider).GetMethod("AutoResize")))).Button.Clicked += OnResizeClicked;
+        }
+
+        private void OnResizeClicked()
+        {
+            foreach (var value in Values)
+            {
+                if (value is BoxCollider collider)
+                    collider.AutoResize();
+            }
+        }
+    }
+
     /// <summary>
     /// Scene tree node for <see cref="BoxCollider"/> actor type.
     /// </summary>
@@ -37,5 +65,13 @@ namespace FlaxEditor.SceneGraph.Actors
 
             return base.RayCastSelf(ref ray, out distance, out normal);
         }
+
+        /// <inheritdoc />
+        public override void PostSpawn()
+        {
+            base.PostSpawn();
+
+            ((BoxCollider)Actor).AutoResize();
+        }
     }
 }

Source/Engine/Physics/Colliders/BoxCollider.cpp

@@ -2,6 +2,7 @@
 
 #include "BoxCollider.h"
 #include "Engine/Physics/PhysicsBackend.h"
+#include "Engine/Level/Scene/Scene.h"
 
 BoxCollider::BoxCollider(const SpawnParams& params)
     : Collider(params)
@@ -19,6 +20,32 @@ void BoxCollider::SetSize(const Float3& value)
     UpdateBounds();
 }
 
+void BoxCollider::AutoResize()
+{
+    Actor* parent = GetParent();
+    if (Cast<Scene>(parent))
+        return;
+
+    // Get bounds of all siblings (excluding itself)
+    const Vector3 parentScale = parent->GetScale();
+    if (parentScale.IsAnyZero())
+        return; // Avoid division by zero
+    BoundingBox parentBox = parent->GetBox();
+    for (const Actor* sibling : parent->Children)
+    {
+        if (sibling != this)
+            BoundingBox::Merge(parentBox, sibling->GetBoxWithChildren(), parentBox);
+    }
+    const Vector3 parentSize = parentBox.GetSize();
+    const Vector3 parentCenter = parentBox.GetCenter() - parent->GetPosition();
+
+    // Update bounds
+    SetLocalPosition(Vector3::Zero);
+    SetSize(parentSize / parentScale);
+    SetCenter(parentCenter / parentScale);
+    SetOrientation(GetOrientation() * Quaternion::Invert(GetOrientation()));
+}
+
 #if USE_EDITOR
 
 #include "Engine/Debug/DebugDraw.h"

Source/Engine/Physics/Colliders/BoxCollider.h

@@ -43,6 +43,11 @@ public:
         return _bounds;
     }
 
+    /// <summary>
+    /// Resizes the collider based on the bounds of it's parent to contain it whole (including any siblings).
+    /// </summary>
+    API_FUNCTION() void AutoResize();
+
 public:
     // [Collider]
 #if USE_EDITOR