diff --git a/fragment.glsl b/fragment.glsl
index e8e273e..270e314 100644
--- a/fragment.glsl
+++ b/fragment.glsl
@@ -3,7 +3,7 @@ out vec4 FragColor;
 uniform vec2 WindowSize;
 uniform float time;
 
-float rand(vec2 co){
+float rand(ivec2 co) {
     return fract(sin(dot(co, vec2(12.9898, 78.233))) * 43758.5453);
 }
 
@@ -13,7 +13,8 @@ float cell_size = 0.1;
 
 // whatever that corner contributes
 float c_dot(vec2 point, vec2 corner) {
-    float angle = rand(corner) * 2*PI;
+    ivec2 c = ivec2(round(corner * 10000));
+    float angle = rand(c) * 2*PI;
     vec2 random_corner_vec = vec2(cos(angle), sin(angle));
     vec2 offset = (point - corner) / cell_size;
     float dot_product = dot(random_corner_vec, offset);
@@ -25,6 +26,7 @@ float lerp(float a, float b, float x) {
     return a + x*(b-a);
 }
 
+// better than built in smoothstep.
 float fade(float t) {
 	return ((6*t - 15)*t + 10)*t*t*t;
 }
@@ -48,12 +50,12 @@ void main() {
     vec2 tile_uv = (uv - c_tl) / cell_size;
 
     // lerp index
-    //float u = fade(tile_uv.x);
-    //float v = fade(tile_uv.y);
+    float u = fade(tile_uv.x);
+    float v = fade(tile_uv.y);
     //float u = tile_uv.x;
     //float v = tile_uv.y;
-    float u = smoothstep(0, 1, tile_uv.x);
-    float v = smoothstep(0, 1, tile_uv.y);
+    //float u = smoothstep(0, 1, tile_uv.x);
+    //float v = smoothstep(0, 1, tile_uv.y);
     //float val = smoothstep(tile_uv.x, smoothstep(tile_uv.y, c_bl_dot, c_tl_dot), smoothstep(tile_uv.y, c_br_dot, c_tr_dot));
     float val = lerp(lerp(c_tl_dot, c_bl_dot, v), lerp(c_tr_dot, c_br_dot, v), u);
     //float val = tile_uv.y;