# electric gird

##### Shader code
``````shader_type canvas_item;

uniform vec3 color : source_color = vec3(0.38,0.57,1.0);
uniform float zoom = 10.0;

/* skew constants for 3d simplex functions */
const float F3 =  0.3333333;
const float G3 =  0.1666667;

vec3 random3(vec3 c) {
float j = 4096.0*sin(dot(c,vec3(17.0, 59.4, 15.0)));
vec3 r;
r.z = fract(512.0*j);
j *= .125;
r.x = fract(512.0*j);
j *= .125;
r.y = fract(512.0*j);
return r-0.5;
}

/* 3d simplex noise */
float simplex3d(vec3 p) {
/* 1. find current tetrahedron T and it's four vertices */
/* s, s+i1, s+i2, s+1.0 - absolute skewed (integer) coordinates of T vertices */
/* x, x1, x2, x3 - unskewed coordinates of p relative to each of T vertices*/

/* calculate s and x */
vec3 s = floor(p + dot(p, vec3(F3)));
vec3 x = p - s + dot(s, vec3(G3));

/* calculate i1 and i2 */
vec3 e = step(vec3(0.0), x - x.yzx);
vec3 i1 = e*(1.0 - e.zxy);
vec3 i2 = 1.0 - e.zxy*(1.0 - e);

/* x1, x2, x3 */
vec3 x1 = x - i1 + G3;
vec3 x2 = x - i2 + 2.0*G3;
vec3 x3 = x - 1.0 + 3.0*G3;

/* 2. find four surflets and store them in d */
vec4 w, d;

/* calculate surflet weights */
w.x = dot(x, x);
w.y = dot(x1, x1);
w.z = dot(x2, x2);
w.w = dot(x3, x3);

/* w fades from 0.6 at the center of the surflet to 0.0 at the margin */
w = max(0.6 - w, 0.0);

/* calculate surflet components */
d.x = dot(random3(s), x);
d.y = dot(random3(s + i1), x1);
d.z = dot(random3(s + i2), x2);
d.w = dot(random3(s + 1.0), x3);

/* multiply d by w^4 */
w *= w;
w *= w;
d *= w;

/* 3. return the sum of the four surflets */
return dot(d, vec4(52.0));
}

float noise(vec3 m) {
return   0.5333333*simplex3d(m)
+0.2666667*simplex3d(2.0*m)
+0.1333333*simplex3d(4.0*m)
+0.0666667*simplex3d(8.0*m);
}

float lightning(vec2 _st,float _zoom,float intensity){
_st.y *= _zoom;
_st = fract(_st);
_st = _st * 2. -1.;

float t = clamp((_st.x * -_st.x * 0.16) + 0.15, 0., 1.);
float y = abs(intensity * -t + _st.y);

float g = pow(y, 0.2);

return g;
}

void fragment()
{
vec2 p = UV/(1.0 / TEXTURE_PIXEL_SIZE).x;
vec3 p3 = vec3(p, TIME*0.4);
float intensity = noise(vec3(p3 * 12.0 + 12.0));

float row = lightning(UV,zoom,intensity);
float col = lightning(UV.yx,zoom,intensity);

COLOR.rgb = color * (2.0 - row - col);
}``````
###### Tags
eletric
The shader code and all code snippets in this post are under CC0 license and can be used freely without the author's permission. Images and videos, and assets depicted in those, do not fall under this license. For more info, see our License terms.

## Related shaders

### Procedural Electric Background Shader

Subscribe
Notify of

1 Comment
Inline Feedbacks
View all comments
WASD Keys Studio
4 months ago

thanks