Precalculated Sin Cos Arrays

11 Comments + Add Comment

• 
  mgear 08/08/2013 at 20:37

  Benchmarking Mathf with System.Math:
  http://forum.unity3d.com/threads/194938-Benchmarking-Mathf-with-System-Math-%28big-performance-differences%29

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• 
  mgear 18/08/2013 at 18:25

  Fast Estimated Sine and Cosine
  http://www.xnawiki.com/index.php/Fast_Estimated_Sine_and_Cosine

  Reply
• 
  D-mo 21/08/2013 at 13:15

  Hello can you help me. I want to return an array with 10 elements in it between -1 and 1. Using Sin or PingPong. Please help. Thanks 🙂

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  • 
    mgear 08/10/2013 at 21:57

    ^ sorry havent had time to test that out..any progress yet?

    Reply
• 
  mgear 08/10/2013 at 21:57

  optimize Bounds:
  http://forum.unity3d.com/threads/204243-Slow-Unity-Math-Please-Unity-Tech-keep-core-math-fast

  Reply
• 
  mgear 25/01/2014 at 15:28

  Vector3:
  http://forum.unity3d.com/threads/224251-How-do-I-fill-a-vector-in-one-line-of-code?p=1496384&viewfull=1#post1496384

  Reply
  • 
    mgear 26/06/2014 at 18:28

    “transform.position is way slower than transform.localPosition”
    http://forum.unity3d.com/threads/could-batched-vector-ops-speed-up-unity.253924/#post-1677880

    Reply
• 
  mgear 26/02/2014 at 15:48

  this shader has FastSinCos function :
  http://forum.unity3d.com/threads/230900-Shader-Release-Moving-Trees-amp-Grass-in-Wind-Outside-of-Terrain

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• 
  prehensile 19/03/2014 at 17:13

  thanks! changed the last line to

  static function Sin(radians:float) {return mSin[radians * mconst];}

  and the file name to m.js

  so i can simply call m.Sin() in any other js.

  Reply
• 
  prehensile 19/03/2014 at 18:06

  Okay i changed the code abit to access it anywere with m.sin m.cos… made loop run in Awake then it can access from other scripts in Start.

  
  #pragma strict
   
  private static var  lookupTableSize:int=100; // or 1024//16384
  private static var  mSin:float[];//
  private static var  mCos:float[];
  private static var  mconst:float;
   
  function Awake ()
  {
  	// init arrays
  	mCos = new float[lookupTableSize];
  	mSin = new float[lookupTableSize];
  	mconst = lookupTableSize / (2*Mathf.PI); // array index constant
  	// build lookup tables
  	var angle:float = 0;
  	for (var i:int=0;i<lookupTableSize;i++)
  	{
  		mSin[i] = Mathf.Sin(angle);
  		mCos[i] = Mathf.Cos(angle);
  		angle += 2*Mathf.PI/lookupTableSize;
  	}	
  
  }
   
  // helper functions
  static function sin (rr:float) :float {return mSin[(rr * mconst)%lookupTableSize];}
  static function cos (rr:float) :float {return mCos[(rr * mconst)%lookupTableSize];}
  

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• 
  mgear 27/11/2014 at 23:01

  Tricks With the Floating-Point Format.
  https://randomascii.wordpress.com/2012/01/11/tricks-with-the-floating-point-format/

  Reply