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108 lines
2.6 KiB
GLSL
108 lines
2.6 KiB
GLSL
// Taste of Noise 17 by Leon Denise 2022-05-17
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// A very distorted volume
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// Playing with a 3D FBM noise
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// https://www.shadertoy.com/view/fljBWK
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float details;
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// rotation matrix
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mat2 rot (float a) { return mat2(cos(a),-sin(a),sin(a),cos(a)); }
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// shortcut for lighting
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#define dt(rn,v,p) pow(dot(rn,normalize(v))*.5+.5,p)
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// https://iquilezles.org/articles/distfunctions/
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float smin(float d1, float d2, float k) { float h = clamp( 0.5 + 0.5*(d2-d1)/k, 0.0, 1.0 ); return mix( d2, d1, h ) - k*h*(1.0-h); }
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// transform linear value into cyclic absolute value
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vec3 bend(vec3 v)
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{
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return abs(sin(v*6.28*2.-iTime*.5));
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}
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// fractal brownian motion (layers of multi scale noise)
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vec3 fbm(vec3 p)
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{
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vec3 result = vec3(0);
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float falloff = 0.5;
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for (float index = 0.; index < 3.; ++index)
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{
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result += bend(texture(iChannel0, p/falloff).xyz) * falloff;
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falloff /= 2.;
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}
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return result;
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}
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// signed distance function
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float map(vec3 p)
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{
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float d = 0.;
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// FBM animated noise
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vec3 ps = p * .5;
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ps.z += iTime*.1;
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vec3 spicy = fbm(ps);
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details = spicy.x;
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spicy = spicy * 2. - 1.;
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// displace volue
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d += spicy.x * .8;
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// volume to surface
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d = abs(d)-.1;
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// substract volume from origin
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float carve = -1.25+.25*sin(iTime*.1+length(p));
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d = smin(d, -(length(p)-0.), carve);
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return d * .25;
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}
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// Antoine Zanuttini
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// https://www.shadertoy.com/view/3sBGzV
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vec3 getNormal (vec3 pos)
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{
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vec2 noff = vec2(0.005,0);
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return normalize(map(pos)-vec3(map(pos-noff.xyy), map(pos-noff.yxy), map(pos-noff.yyx)));
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}
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void mainImage( out vec4 fragColor, in vec2 fragCoord )
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{
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// coordinates
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vec2 uv = (fragCoord.xy - iResolution.xy / 2.)/iResolution.y;
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vec3 noise = texture(iChannel1, fragCoord.xy/1024.+iTime).rgb;
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vec3 ray = normalize(vec3(uv, .5));
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vec3 pos = vec3(0,0,0);
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// init variables
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vec3 color, normal, tint, dir, refl;
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float index, shade, light;
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const float count = 50.;
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// ray marching
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for (index = count; index > 0.; --index)
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{
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float dist = map(pos);
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if (dist < .001) break;
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dist *= .9+.1*noise.z;
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pos += ray*dist;
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}
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// lighting
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shade = index/count;
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normal = getNormal(pos);
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tint = .5+.5*cos(vec3(1,2,3)+details*20.);
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refl = reflect(ray, normal);
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color += tint;
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color += vec3(1.000,0.502,0.792)*dt(refl, vec3(0,0,-1), .5);
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color = clamp(color * shade, 0., 1.);
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// temporal buffer
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uv = fragCoord.xy / iResolution.xy;
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vec3 frame = texture(iChannel2, uv).rgb;
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color = mix(color, frame, .9);
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fragColor = vec4(color, 1.);
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}
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