Hi,
I converted this shader from glsl into hlsl.
It gives the distance and a gradient from the input coordinates to the cell center in relation to the voronoi cell to which it belongs to.
Don't ask me how the math works here. I saw this shader had a basic understanding and converted it. It works great.
I have only added the id to the original to color the cells differently.
float2 hash2(float2 p)
{
return tex2D(permSampler2d, (p + 0.5) / 256.0).rg;
}
float4 voronoi( in float2 x)
{
float2 n = floor(x);
float2 f = frac(x);
//----------------------------------
// first pass: regular voronoi
//----------------------------------
float2 mg;
float2 mr;
float id;
float md = 8.0;
for( int j = -1; j < 2; j++ )
{
for( int i = -1; i < 2; i++ )
{
float2 g = float2(i, j);
float2 o = hash2( n + g );
float2 r = g + o - f;
float d = dot(r, r);
if( d < md )
{
md = d;
mr = r;
mg = g;
id = length(o);
}
}
}
//----------------------------------
// second pass: distance to borders
//----------------------------------
md = 8.0;
for( int j=-2; j<=2; j++ )
{
for( int i=-2; i<=2; i++ )
{
float2 g = mg + float2(i, j);
float2 o = hash2( n + g );
float2 r = g + o - f;
if( dot(mr - r, mr - r) > 0.00001 )
md = min( md, dot( 0.5 * ( mr + r ), normalize( r - mr ) ) );
}
}
return float4( md, mr, id);
}
float4 postprocessing_noise( float2 Tex : TEXCOORD0 ) : COLOR0
{
float2 p;
p.x = Tex.x + vecSkill1[0]; // vecSkill - offset_x
p.y = Tex.y + vecSkill1[1]; // vecSkill - offset_y
float4 c = voronoi( vecSkill1[2] * p ); // vecSkill frequency
[...]
What I need:
I need the distance of the cell core or the cell middle to the middle of the image. I have some trouble to bring the voronoi point into the 0.0 - 1.0 space.
why?
I want to create an island generator. The cells outside the defined range should be black and the rest white (don't worry randomness can be achieved through a second permutation map). The color should be changed by cell, not by pixel coordinate.
