updating atom mesh component to support non-uniform scale component

Code/Framework/AzCore/AzCore/Math/Aabb.cpp

@@ -146,8 +146,8 @@ namespace AZ
                 ->Attribute(AZ::Script::Attributes::ExcludeFrom, AZ::Script::Attributes::ExcludeFlags::All)
                 ->Method("GetTranslated", &Aabb::GetTranslated)
                 ->Method("GetSurfaceArea", &Aabb::GetSurfaceArea)
-                ->Method("GetTransformedObb", &Aabb::GetTransformedObb)
-                ->Method("GetTransformedAabb", &Aabb::GetTransformedAabb)
+                ->Method("GetTransformedObb", static_cast<Obb(Aabb::*)(const Transform&) const>(&Aabb::GetTransformedObb))
+                ->Method("GetTransformedAabb", static_cast<Aabb(Aabb::*)(const Transform&) const>(&Aabb::GetTransformedAabb))
                 ->Method("ApplyTransform", &Aabb::ApplyTransform)
                 ->Attribute(AZ::Script::Attributes::ExcludeFrom, AZ::Script::Attributes::ExcludeFlags::All)
                 ->Method("Clone", [](const Aabb& rhs) -> Aabb { return rhs; })
@@ -195,6 +195,20 @@ namespace AZ
     }
 
 
+    Obb Aabb::GetTransformedObb(const Matrix3x4& matrix3x4) const
+    {
+        Matrix3x4 matrixNoScale = matrix3x4;
+        const AZ::Vector3 scale = matrixNoScale.ExtractScale();
+        const AZ::Quaternion rotation = AZ::Quaternion::CreateFromMatrix3x4(matrixNoScale);
+
+        return Obb::CreateFromPositionRotationAndHalfLengths(
+            matrix3x4 * GetCenter(),
+            rotation,
+            0.5f * scale * GetExtents()
+        );
+    }
+
+
     void Aabb::ApplyTransform(const Transform& transform)
     {
         Vector3 a, b, axisCoeffs;
@@ -224,4 +238,17 @@ namespace AZ
         m_min = newMin;
         m_max = newMax;
     }
+
+
+    void Aabb::ApplyMatrix3x4(const Matrix3x4& matrix3x4)
+    {
+        const AZ::Vector3 extents = GetExtents();
+        const AZ::Vector3 center = GetCenter();
+        AZ::Vector3 newHalfExtents(
+            0.5f * matrix3x4.GetRowAsVector3(0).GetAbs().Dot(extents),
+            0.5f * matrix3x4.GetRowAsVector3(1).GetAbs().Dot(extents),
+            0.5f * matrix3x4.GetRowAsVector3(2).GetAbs().Dot(extents));
+        m_min = center - newHalfExtents;
+        m_max = center + newHalfExtents;
+    }
 }

Code/Framework/AzCore/AzCore/Math/Aabb.h

@@ -129,12 +129,20 @@ namespace AZ
 
         void ApplyTransform(const Transform& transform);
 
+        void ApplyMatrix3x4(const Matrix3x4& matrix3x4);
+
         //! Transforms an Aabb and returns the resulting Obb.
-        class Obb GetTransformedObb(const Transform& transform) const;
+        Obb GetTransformedObb(const Transform& transform) const;
+
+        //! Transforms an Aabb and returns the resulting Obb.
+        Obb GetTransformedObb(const Matrix3x4& matrix3x4) const;
 
         //! Returns a new AABB containing the transformed AABB.
         Aabb GetTransformedAabb(const Transform& transform) const;
 
+        //! Returns a new AABB containing the transformed AABB.
+        Aabb GetTransformedAabb(const Matrix3x4& matrix3x4) const;
+
         //! Checks if this aabb is equal to another within a floating point tolerance.
         bool IsClose(const Aabb& rhs, float tolerance = Constants::Tolerance) const;
 

Code/Framework/AzCore/AzCore/Math/Aabb.inl

@@ -300,6 +300,14 @@ namespace AZ
     }
 
 
+    AZ_MATH_INLINE Aabb Aabb::GetTransformedAabb(const Matrix3x4& matrix3x4) const
+    {
+        Aabb aabb = Aabb::CreateFromMinMax(m_min, m_max);
+        aabb.ApplyMatrix3x4(matrix3x4);
+        return aabb;
+    }
+
+
     AZ_MATH_INLINE bool Aabb::IsClose(const Aabb& rhs, float tolerance) const
     {
         return m_min.IsClose(rhs.m_min, tolerance) && m_max.IsClose(rhs.m_max, tolerance);