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diff --git a/thirdparty/vhacd/inc/btAlignedAllocator.h b/thirdparty/vhacd/inc/btAlignedAllocator.h
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+++ b/thirdparty/vhacd/inc/btAlignedAllocator.h
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+/*
+Bullet Continuous Collision Detection and Physics Library
+Copyright (c) 2003-2006 Erwin Coumans  http://continuousphysics.com/Bullet/
+
+This software is provided 'as-is', without any express or implied warranty.
+In no event will the authors be held liable for any damages arising from the use of this software.
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it freely,
+subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
+2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
+3. This notice may not be removed or altered from any source distribution.
+*/
+
+#ifndef BT_ALIGNED_ALLOCATOR
+#define BT_ALIGNED_ALLOCATOR
+
+///we probably replace this with our own aligned memory allocator
+///so we replace _aligned_malloc and _aligned_free with our own
+///that is better portable and more predictable
+
+#include "btScalar.h"
+
+// -- GODOT start --
+namespace VHACD {
+// -- GODOT end --
+
+//#define BT_DEBUG_MEMORY_ALLOCATIONS 1
+#ifdef BT_DEBUG_MEMORY_ALLOCATIONS
+
+#define btAlignedAlloc(a, b) \
+    btAlignedAllocInternal(a, b, __LINE__, __FILE__)
+
+#define btAlignedFree(ptr) \
+    btAlignedFreeInternal(ptr, __LINE__, __FILE__)
+
+void* btAlignedAllocInternal(size_t size, int32_t alignment, int32_t line, char* filename);
+
+void btAlignedFreeInternal(void* ptr, int32_t line, char* filename);
+
+#else
+void* btAlignedAllocInternal(size_t size, int32_t alignment);
+void btAlignedFreeInternal(void* ptr);
+
+#define btAlignedAlloc(size, alignment) btAlignedAllocInternal(size, alignment)
+#define btAlignedFree(ptr) btAlignedFreeInternal(ptr)
+
+#endif
+typedef int32_t size_type;
+
+typedef void*(btAlignedAllocFunc)(size_t size, int32_t alignment);
+typedef void(btAlignedFreeFunc)(void* memblock);
+typedef void*(btAllocFunc)(size_t size);
+typedef void(btFreeFunc)(void* memblock);
+
+///The developer can let all Bullet memory allocations go through a custom memory allocator, using btAlignedAllocSetCustom
+void btAlignedAllocSetCustom(btAllocFunc* allocFunc, btFreeFunc* freeFunc);
+///If the developer has already an custom aligned allocator, then btAlignedAllocSetCustomAligned can be used. The default aligned allocator pre-allocates extra memory using the non-aligned allocator, and instruments it.
+void btAlignedAllocSetCustomAligned(btAlignedAllocFunc* allocFunc, btAlignedFreeFunc* freeFunc);
+
+///The btAlignedAllocator is a portable class for aligned memory allocations.
+///Default implementations for unaligned and aligned allocations can be overridden by a custom allocator using btAlignedAllocSetCustom and btAlignedAllocSetCustomAligned.
+template <typename T, unsigned Alignment>
+class btAlignedAllocator {
+
+    typedef btAlignedAllocator<T, Alignment> self_type;
+
+public:
+    //just going down a list:
+    btAlignedAllocator() {}
+    /*
+	btAlignedAllocator( const self_type & ) {}
+	*/
+
+    template <typename Other>
+    btAlignedAllocator(const btAlignedAllocator<Other, Alignment>&) {}
+
+    typedef const T* const_pointer;
+    typedef const T& const_reference;
+    typedef T* pointer;
+    typedef T& reference;
+    typedef T value_type;
+
+    pointer address(reference ref) const { return &ref; }
+    const_pointer address(const_reference ref) const { return &ref; }
+    pointer allocate(size_type n, const_pointer* hint = 0)
+    {
+        (void)hint;
+        return reinterpret_cast<pointer>(btAlignedAlloc(sizeof(value_type) * n, Alignment));
+    }
+    void construct(pointer ptr, const value_type& value) { new (ptr) value_type(value); }
+    void deallocate(pointer ptr)
+    {
+        btAlignedFree(reinterpret_cast<void*>(ptr));
+    }
+    void destroy(pointer ptr) { ptr->~value_type(); }
+
+    template <typename O>
+    struct rebind {
+        typedef btAlignedAllocator<O, Alignment> other;
+    };
+    template <typename O>
+    self_type& operator=(const btAlignedAllocator<O, Alignment>&) { return *this; }
+
+    friend bool operator==(const self_type&, const self_type&) { return true; }
+};
+
+// -- GODOT start --
+}; // namespace VHACD
+// -- GODOT end --
+
+#endif //BT_ALIGNED_ALLOCATOR