Unity Shader Graph custom node for precise voronoi borders

README.md

Unity Shader Graph custom node for precise voronoi borders

Code based on Inigo Quilez approach:

• https://www.iquilezles.org/www/articles/voronoilines/voronoilines.htm

It uses the same random calculations as the Unity standard Shader Graph Voronoi so both patterns can be overlapped.

VoronoiBorders_Shadergraph

$precision2 n = floor(UV * CellDensity);
$precision2 f = frac(UV * CellDensity);

// first pass: regular voronoi
$precision2 mg, mr;
$precision md = 8.0;
for (int j= -1; j <= 1; j++) {
    for (int i= -1; i <= 1; i++) {
        $precision2 g = $precision2(i,j);

        $precision2x2 m = $precision2x2(15.27, 47.63, 99.41, 89.98);
        $precision2 uvr = frac(sin(mul(g+n, m)) * 46839.32);
        $precision2 o = $precision2(sin(uvr.y*+AngleOffset)*0.5+0.5, cos(uvr.x*AngleOffset)*0.5+0.5);

        $precision2 r = g + o - f;
        $precision d = dot(r,r);

        if( d<md ) {
            md = d;
            mr = r;
            mg = g;
        }
    }
}

// second pass: distance to borders
md = 8.0;
for (int j= -2; j <= 2; j++) {
    for (int i= -2; i <= 2; i++) {
        $precision2 g = mg + $precision2(i,j);
        $precision2x2 m = $precision2x2(15.27, 47.63, 99.41, 89.98);
        $precision2 uvr = frac(sin(mul(g+n, m)) * 46839.32);
        $precision2 o = $precision2(sin(uvr.y*+AngleOffset)*0.5+0.5, cos(uvr.x*AngleOffset)*0.5+0.5);

        $precision2 r = g + o - f;

        if ( dot(mr-r,mr-r)>0.0001 ) {
            md = min(md, dot( 0.5*(mr+r), normalize(r-mr) ));
        }
    }
}

Out = $precision3(md, mr.x, mr.y);

VoronoiComparisson.png

VoronoiSetup.png

This is great! I was looking for a way to do something similar. I wanted to create UVs that I could use to place textures accurately in each cell so I could move textures along with the voronoi noise. This looks really close. How could you modify this to get a nice clean UV map for each cell? This looks more like you are generating this for normals.