Add support for double precision floats about flaxengine HOT 1 CLOSED

Added to the master! Can be enabled in a custom engine build by setting this to true:

Soon there will be proper support for the rendering relative to the camera (work in progress) and implementation of 64-bit coordinates in other systems (audio, physics,..). Then, of course we will add documentation.

By setting UseLargeWorlds=true the Vector2/3/4 types are using double instead of float:

• C++
  

  FlaxEngine/Source/Engine/Core/Types/BaseTypes.h

  Lines 93 to 124 in 18cd7b6

  	#if USE_LARGE_WORLDS
  	// 64-bit precision for world coordinates
  	API_TYPEDEF(Alias) typedef double Real;
  	#define MIN_Real MIN_double
  	#define MAX_Real MAX_double
  	#else
  	// 32-bit precision for world coordinates
  	API_TYPEDEF(Alias) typedef float Real;
  	#define MIN_Real MIN_float
  	#define MAX_Real MAX_float
  	#endif
  	// Vector2
  	template<typename T> struct Vector2Base;
  	API_TYPEDEF() typedef Vector2Base<float> Float2;
  	API_TYPEDEF() typedef Vector2Base<double> Double2;
  	API_TYPEDEF() typedef Vector2Base<int32> Int2;
  	API_TYPEDEF(Alias) typedef Vector2Base<Real> Vector2;
  	// Vector3
  	template<typename T> struct Vector3Base;
  	API_TYPEDEF() typedef Vector3Base<float> Float3;
  	API_TYPEDEF() typedef Vector3Base<double> Double3;
  	API_TYPEDEF() typedef Vector3Base<int32> Int3;
  	API_TYPEDEF(Alias) typedef Vector3Base<Real> Vector3;
  	// Vector4
  	template<typename T> struct Vector4Base;
  	API_TYPEDEF() typedef Vector4Base<float> Float4;
  	API_TYPEDEF() typedef Vector4Base<double> Double4;
  	API_TYPEDEF() typedef Vector4Base<int32> Int4;
  	API_TYPEDEF(Alias) typedef Vector4Base<Real> Vector4;

• C#
  

  FlaxEngine/Source/Engine/Core/Math/Vector3.cs

  Lines 1 to 5 in 18cd7b6

  	#if USE_LARGE_WORLDS
  	using Real = System.Double;
  	#else
  	using Real = System.Single;
  	#endif

We do have vector types Float2/3/4, Double2/3/4 and Int2/3/4 to explicitly use certain precision and data size.

from flaxengine.