code version of mathf.PerlinNoise and fast perlin noise 2d -3d

Unity Engine
1

Hi all, here is are some versions of perlin noise in .js code, it’s pretty fast. i had them at hand and i think it’s a cool reference for unity for those that want to know about the mathf.PerlinNoise how it is made.

function lerps(o:float, v:float, alpha:float):float
{
    o += ( v - o ) * alpha;
    return o;
}

function lnz ( vtx: Vector3 ): float //3d perlin noise code fast
{  
    vtx= Vector3 ( Mathf.Abs(vtx.x) , Mathf.Abs(vtx.y) , Mathf.Abs(vtx.z) ) ;
    var I = Vector3 (Mathf.Floor(vtx.x),Mathf.Floor(vtx.y),Mathf.Floor(vtx.z));
    var D = Vector3(vtx.x%1,vtx.y%1,vtx.z%1);
    D = Vector3(D.x*D.x*(3.0-2.0*D.x),D.y*D.y*(3.0-2.0*D.y),D.z*D.z*(3.0-2.0*D.z));
    var W = I.x + I.y*71.0 + 125.0*I.z;

    return lerps(          
                lerps( lerps(rndng(W+0.0),rndng(W+1.0),D.x) , lerps(rndng(W+71.0),rndng(W+72.0),D.x) , D.y)
                ,
                lerps( lerps(rndng(W+125.0),rndng(W+126.0),D.x) , lerps(rndng(W+153.0),rndng(W+154.0),D.x) , D.y)
                ,
                D.z
                );
}

function lnzo ( vtx: Vector3 ): float //perlin noise, same as unityfunction version
{
    var total = 0.0;  
    for (var i:int = 1; i < 5; i ++)
    {
        total+= lnz2(Vector3 (vtx.x*(i*i),0.0,vtx.z*(i*i)))/(i*i);
    }

    return total*5;

}
function lnzh ( vtx: Vector3 ): float // perlin noise, 2d, with 3 axes at 60'instead of 2 x y axes
{  
    vtx= Vector3 ( Mathf.Abs(vtx.z) , Mathf.Abs(vtx.z*.5-vtx.x*.866) , Mathf.Abs(vtx.z*.5+vtx.x*.866) ) ;
    var I = Vector3 (Mathf.Floor(vtx.x),Mathf.Floor(vtx.y),Mathf.Floor(vtx.z));
    var D = Vector3(vtx.x%1,vtx.y%1,vtx.z%1);
   //D = Vector3(D.x*D.x*(3.0-2.0*D.x),D.y*D.y*(3.0-2.0*D.y),D.z*D.z*(3.0-2.0*D.z));
    var W = I.x + I.y*71.0 + 125.0*I.z;

    return lerps(          
                lerps( lerps(rndng(W+0.0),rndng(W+1.0),D.x) , lerps(rndng(W+71.0),rndng(W+72.0),D.x) , D.y)
                ,
                lerps( lerps(rndng(W+125.0),rndng(W+126.0),D.x) , lerps(rndng(W+153.0),rndng(W+154.0),D.x) , D.y)
                ,
                D.z
                );
}

function lnz2 ( vtx: Vector3 ): float // i think this is 2d perlin noise
{  
    vtx= Vector3 ( Mathf.Abs(vtx.x) , Mathf.Abs(vtx.y) , Mathf.Abs(vtx.z) ) ;
    var I = Vector3 (Mathf.Floor(vtx.x),Mathf.Floor(vtx.y),Mathf.Floor(vtx.z));
    var D = Vector3(vtx.x%1,vtx.y%1,vtx.z%1);
    D = Vector3(D.x*D.x*(3.0-2.0*D.x),D.y*D.y*(3.0-2.0*D.y),D.z*D.z*(3.0-2.0*D.z));
    var W = I.x + I.y*71.0 + 125.0*I.z;

    return lerps(      
                lerps( lerps(rndng(W+0.0),rndng(W+1.0),D.x) , lerps(rndng(W+71.0),rndng(W+72.0),D.x) , D.z)
                ,
                lerps( rndng(W+125.0), rndng(W+126.0),D.x)
                ,
                D.z
                );                  
}
2

This is pretty cool.

3

What is rndng()?

4

If you are going to post code for other people, use the full variable names.

5

sorry i lost my previous login because im on a new PC… RNDNG is a random integer…

function rndng ( n: float ): float
{//random proportion -1, 1
var e = ( n0.3452 )%1;
return (ee*31497.129)%2-1;
}

6

doesn’t look like a random integer to me.

It creates floats (not integers) in the range of -1 to 1.

Not sure the algorithm off the top of my head… a weird take on blum blum shub? I have no idea honestly…