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elkozmon/metaballs.glsl

Forked from julien/metaballs.glsl
Last active October 20, 2017 07:47
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simple metaball shader
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metaballs.glsl
precision highp float;
uniform float time;
uniform vec2 mouse;
uniform vec2 resolution;
float ball(vec2 p, float fx, float fy, float ax, float ay) {
vec2 r = vec2(p.x + sin(time * fx) * ax, p.y + cos(time * fy) * ay);
return 0.05 / length(r);
}
void main(void) {
vec2 q = gl_FragCoord.xy / resolution.xy;
vec2 p = -1.0 + 2.0 * q;
p.x *= resolution.x / resolution.y;
float col = 0.0;
col += ball(p, 1.0, 2.0, 0.1, 0.2);
col += ball(p, 1.5, 2.5, 0.2, 0.3);
col += ball(p, 2.0, 3.0, 0.3, 0.4);
col += ball(p, 2.5, 3.5, 0.4, 0.5);
col += ball(p, 3.0, 4.0, 0.5, 0.6);
col += ball(p, 1.5, 0.5, 0.6, 0.7);
col += ball(p, 0.1, .5, 0.6, 0.7);
col = smoothstep(0.99, 1.0, col);
gl_FragColor = vec4(col * 0.8, col * 0.3, col * 0.3, 1.0);
}
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