feat(physics): wire physx sdk into build

engine/third_party/physx/include/extensions/PxSmoothNormals.h

@@ -0,0 +1,56 @@
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions
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+//    from this software without specific prior written permission.
+//
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+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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+//
+// Copyright (c) 2008-2025 NVIDIA Corporation. All rights reserved.
+// Copyright (c) 2004-2008 AGEIA Technologies, Inc. All rights reserved.
+// Copyright (c) 2001-2004 NovodeX AG. All rights reserved.  
+
+#ifndef PX_SMOOTH_NORMALS_H
+#define PX_SMOOTH_NORMALS_H
+
+#include "foundation/PxVec3.h"
+#include "common/PxPhysXCommonConfig.h"
+
+/**
+\brief Builds smooth vertex normals over a mesh.
+
+- "smooth" because smoothing groups are not supported here
+- takes angles into account for correct cube normals computation
+
+To use 32bit indices pass a pointer in dFaces and set wFaces to zero. Alternatively pass a pointer to 
+wFaces and set dFaces to zero.
+
+\param[in] nbTris Number of triangles
+\param[in] nbVerts Number of vertices
+\param[in] verts Array of vertices
+\param[in] dFaces Array of dword triangle indices, or null
+\param[in] wFaces Array of word triangle indices, or null
+\param[out] normals Array of computed normals (assumes nbVerts vectors)
+\param[in] flip Flips the normals or not
+\return True on success.
+*/
+PX_C_EXPORT bool PX_CALL_CONV PxBuildSmoothNormals(physx::PxU32 nbTris, physx::PxU32 nbVerts, const physx::PxVec3* verts,
+												   const physx::PxU32* dFaces, const physx::PxU16* wFaces, physx::PxVec3* normals, bool flip);
+
+#endif