diff --git a/.gitignore b/.gitignore
index db4c6d9..b186605 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 dist
-node_modules
\ No newline at end of file
+node_modules
+.DS_Store
diff --git a/package.json b/package.json
index 5cc5ec5..a76a239 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "cobe",
-  "version": "0.4.1",
+  "version": "0.4.2",
   "type": "module",
   "main": "./dist/index.esm.js",
   "files": [
diff --git a/src/shader.frag b/src/shader.frag
index 3e8f7cd..9a165e7 100644
--- a/src/shader.frag
+++ b/src/shader.frag
@@ -77,9 +77,39 @@ vec3 nearestFibonacciLattice(vec3 p, out float m) {
     // float v = idx / kPhi;
     // float theta = fract(v) * kTau;
 
-    int iFracV = int(idx) * 2654435769; // signed be like nearest-to-zero fmod; 2^32/phi
-    float fracV = float(iFracV) * by2P32;
-    float theta = fracV * kTau;
+    // int iFracV = int(idx) * 2654435769; // signed be like nearest-to-zero fmod; 2^32/phi
+    // float fracV = float(iFracV) * by2P32;
+    // float theta = fracV * kTau;
+
+    // https://github.com/shuding/cobe/issues/16
+    
+    float tidx = idx;
+    float fracV = 0.;
+
+    // see codegen
+
+    if(tidx >= 524288.) { tidx-=524288.; fracV += 0.8038937048986554; }
+    if(tidx >= 262144.) { tidx-=262144.; fracV += 0.9019468524493277; }
+    if(tidx >= 131072.) { tidx-=131072.; fracV += 0.9509734262246639; }
+    if(tidx >= 65536.) { tidx-=65536.; fracV += 0.4754867131123319; }
+    if(tidx >= 32768.) { tidx-=32768.; fracV += 0.737743356556166; }
+    if(tidx >= 16384.) { tidx-=16384.; fracV += 0.868871678278083; }
+    if(tidx >= 8192.) { tidx-=8192.; fracV += 0.9344358391390415; }
+    if(tidx >= 4096.) { tidx-=4096.; fracV += 0.46721791956952075; }
+    if(tidx >= 2048.) { tidx-=2048.; fracV += 0.7336089597847604; }
+    if(tidx >= 1024.) { tidx-=1024.; fracV += 0.8668044798923802; }
+    if(tidx >= 512.) { tidx-=512.; fracV += 0.4334022399461901; }
+    if(tidx >= 256.) { tidx-=256.; fracV += 0.21670111997309505; }
+    if(tidx >= 128.) { tidx-=128.; fracV += 0.10835055998654752; }
+    if(tidx >= 64.) { tidx-=64.; fracV += 0.5541752799932738; }
+    if(tidx >= 32.) { tidx-=32.; fracV += 0.7770876399966369; }
+    if(tidx >= 16.) { tidx-=16.; fracV += 0.8885438199983184; }
+    if(tidx >= 8.) { tidx-=8.; fracV += 0.9442719099991592; }
+    if(tidx >= 4.) { tidx-=4.; fracV += 0.4721359549995796; }
+    if(tidx >= 2.) { tidx-=2.; fracV += 0.2360679774997898; }
+    if(tidx >= 1.) { tidx-=1.; fracV += 0.6180339887498949; }
+
+    float theta = fract(fracV) * kTau;
 
     float cosphi = 1. - 2. * idx * byDots;
     float sinphi = sqrt(1. - cosphi * cosphi);
diff --git a/src/shader.min.js b/src/shader.min.js
index f2707e5..45978b6 100644
--- a/src/shader.min.js
+++ b/src/shader.min.js
@@ -1,7 +1,7 @@
 export const GLSLX_SOURCE_MAIN =
-  'precision highp float;uniform vec2 u;uniform vec3 J,K,x;uniform vec4 y[64];uniform float z,A,j,B,C,D,E;uniform sampler2D F;float G=1./j;mat3 H(float a,float b){float c=cos(a),d=cos(b),e=sin(a),f=sin(b);return mat3(d,f*e,-f*c,0.,c,e,f,d*-e,d*c);}vec3 v(vec3 a,out float w){a=a.xzy;float n=max(2.,floor(log2(2.236068*j*3.141593*(1.-a.z*a.z))*.72021));vec2 e=floor(pow(1.618034,n)/2.236068*vec2(1.,1.618034)+.5),b=fract((e+1.)*.618034)*6.283185-3.883222,c=-2.*e,d=vec2(atan(a.y,a.x),a.z-1.),o=floor(vec2(c.y*d.x-b.y*(d.y*j+1.),-c.x*d.x+b.x*(d.y*j+1.))/(b.x*c.y-c.x*b.y));float l=3.141593;vec3 p;for(float f=0.;f<4.;f+=1.){vec2 q=vec2(mod(f,2.),floor(f*.5));float h=dot(e,o+q);if(h>j)continue;int r=int(h)*-1640531527;float s=float(r)*2.328306e-10,i=s*6.283185,g=1.-2.*h*G,k=sqrt(1.-g*g);vec3 m=vec3(cos(i)*k,sin(i)*k,g);float t=length(a-m);if(t<l)l=t,p=m;}w=l;return p.xzy;}void main(){vec2 a=gl_FragCoord.xy/u*2.-1.;a.x*=u.x/u.y;float c=dot(a,a),b;vec3 d=vec3(0.,0.,1.),e=normalize(vec3(a,sqrt(.64-c)));if(c<=.64){vec3 f=e*H(A,z),g=v(f,b);float k=asin(g.y),h=acos(-g.x/cos(k));h=g.z<0.?-h:h;float s=texture2D(F,vec2(h*.5/3.141593,-(k/3.141593+.5))).x,t=smoothstep(8e-3,0.,b),l=dot(e,d),r=pow(l,D)*C,m=s*t*r,L=mix((1.-m)*pow(l,.4),m,E)+.1;gl_FragColor=vec4(J*L,1.);int M=int(B);float n=0.;for(int i=0;i<64;i++){if(i>=M)break;vec4 o=y[i];vec3 p=o.xyz,w=p-f;float q=o.w;if(dot(w,w)>q*q*4.)continue;vec3 N=v(p,b);b=length(N-f),b<q?n+=smoothstep(q*.5,0.,b):0.;}n=min(1.,n*r),gl_FragColor.xyz=mix(gl_FragColor.xyz,K,n),gl_FragColor.xyz+=pow(1.-dot(e,d),4.)*x;}float I=pow(dot(normalize(vec3(-a,sqrt(1.-c))),d),4.)*smoothstep(.1,1.,.2/(c-.64));gl_FragColor+=vec4(I*x,I);}'
+  'precision highp float;uniform vec2 u;uniform vec3 J,K,x;uniform vec4 y[64];uniform float z,A,k,B,C,D,E;uniform sampler2D F;float G=1./k;mat3 H(float a,float b){float c=cos(a),d=cos(b),e=sin(a),f=sin(b);return mat3(d,f*e,-f*c,0.,c,e,f,d*-e,d*c);}vec3 v(vec3 c,out float w){c=c.xzy;float p=max(2.,floor(log2(2.236068*k*3.141593*(1.-c.z*c.z))*.72021));vec2 g=floor(pow(1.618034,p)/2.236068*vec2(1.,1.618034)+.5),d=fract((g+1.)*.618034)*6.283185-3.883222,e=-2.*g,f=vec2(atan(c.y,c.x),c.z-1.),q=floor(vec2(e.y*f.x-d.y*(f.y*k+1.),-e.x*f.x+d.x*(f.y*k+1.))/(d.x*e.y-e.x*d.y));float n=3.141593;vec3 r;for(float h=0.;h<4.;h+=1.){vec2 s=vec2(mod(h,2.),floor(h*.5));float j=dot(g,q+s);if(j>k)continue;float a=j,b=0.;if(a>=524288.)a-=524288.,b+=.803894;if(a>=262144.)a-=262144.,b+=.901947;if(a>=131072.)a-=131072.,b+=.950973;if(a>=65536.)a-=65536.,b+=.475487;if(a>=32768.)a-=32768.,b+=.737743;if(a>=16384.)a-=16384.,b+=.868872;if(a>=8192.)a-=8192.,b+=.934436;if(a>=4096.)a-=4096.,b+=.467218;if(a>=2048.)a-=2048.,b+=.733609;if(a>=1024.)a-=1024.,b+=.866804;if(a>=512.)a-=512.,b+=.433402;if(a>=256.)a-=256.,b+=.216701;if(a>=128.)a-=128.,b+=.108351;if(a>=64.)a-=64.,b+=.554175;if(a>=32.)a-=32.,b+=.777088;if(a>=16.)a-=16.,b+=.888544;if(a>=8.)a-=8.,b+=.944272;if(a>=4.)a-=4.,b+=.472136;if(a>=2.)a-=2.,b+=.236068;if(a>=1.)a-=1.,b+=.618034;float l=fract(b)*6.283185,i=1.-2.*j*G,m=sqrt(1.-i*i);vec3 o=vec3(cos(l)*m,sin(l)*m,i);float t=length(c-o);if(t<n)n=t,r=o;}w=n;return r.xzy;}void main(){vec2 a=gl_FragCoord.xy/u*2.-1.;a.x*=u.x/u.y;float c=dot(a,a),b;vec3 d=vec3(0.,0.,1.),e=normalize(vec3(a,sqrt(.64-c)));if(c<=.64){vec3 f=e*H(A,z),g=v(f,b);float j=asin(g.y),h=acos(-g.x/cos(j));h=g.z<0.?-h:h;float s=texture2D(F,vec2(h*.5/3.141593,-(j/3.141593+.5))).x,t=smoothstep(8e-3,0.,b),l=dot(e,d),r=pow(l,D)*C,m=s*t*r,L=mix((1.-m)*pow(l,.4),m,E)+.1;gl_FragColor=vec4(J*L,1.);int M=int(B);float n=0.;for(int i=0;i<64;i++){if(i>=M)break;vec4 o=y[i];vec3 p=o.xyz,w=p-f;float q=o.w;if(dot(w,w)>q*q*4.)continue;vec3 N=v(p,b);b=length(N-f),b<q?n+=smoothstep(q*.5,0.,b):0.;}n=min(1.,n*r),gl_FragColor.xyz=mix(gl_FragColor.xyz,K,n),gl_FragColor.xyz+=pow(1.-dot(e,d),4.)*x;}float I=pow(dot(normalize(vec3(-a,sqrt(1.-c))),d),4.)*smoothstep(.1,1.,.2/(c-.64));gl_FragColor+=vec4(I*x,I);}'
 
-export const GLSLX_NAME_DOTS = 'j'
+export const GLSLX_NAME_DOTS = 'k'
 export const GLSLX_NAME_U_RESOLUTION = 'u'
 export const GLSLX_NAME_GLOW_COLOR = 'x'
 export const GLSLX_NAME_MARKERS = 'y'