204 lines
6.1 KiB
JavaScript
204 lines
6.1 KiB
JavaScript
export default `
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#define MAX_STEPS 1280
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#define MAX_DIST 1280.
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#define E 0.01
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#define PI 3.141592
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#define MYTIME iTime * 1.
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// Turn to 1 to activate displacement mapping
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#define DISPLACEMENT_MAPPING 1
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vec3 rotX(vec3 v, float a)
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{
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return vec3(v.x, v.y * cos(a) - v.z * sin(a), v.y * sin(a) + v.z * cos(a));
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}
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vec3 rotY(vec3 v, float a)
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{
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return vec3(v.x * cos(a) + v.z * sin(a), v.y, v.z * cos(a) - v.x * sin(a));
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}
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vec3 rotZ(vec3 v, float a)
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{
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return vec3(v.x * cos(a) - v.y * sin(a), v.x * sin(a) + v.y * cos(a), v.z);
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}
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vec3 modSDF(vec3 p, vec3 c)
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{
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return mod(p + 0.5 * c, c) - 0.5 * c;
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}
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vec3 modSDFlim( in vec3 p, in float c, in vec3 l)
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{
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return p-c*vec3(clamp(floor(p.x/c + 0.5),-l.x,l.x), clamp(floor(p.y/c + 0.5),-l.y,l.y), clamp(floor(p.z/c + 0.5),-l.z,l.z));
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}
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vec3 twistSDF(in vec3 p, float k )
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{
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float c = cos(k*p.y);
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float s = sin(k*p.y);
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mat2 m = mat2(c,-s,s,c);
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vec3 q = vec3(m*p.xz,p.y);
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return q;
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}
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float sdfBox( vec3 p, vec3 b )
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{
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vec3 q = abs(p) - b;
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return length(max(q,0.0)) + min(max(q.x,max(q.y,q.z)),0.0);
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}
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// blackbody by aiekick : https://www.shadertoy.com/view/lttXDn
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// -------------blackbody----------------- //
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// return color from temperature
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//http://www.physics.sfasu.edu/astro/color/blackbody.html
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//http://www.vendian.org/mncharity/dir3/blackbody/
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//http://www.vendian.org/mncharity/dir3/blackbody/UnstableURLs/bbr_color.html
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vec3 blackbody(float Temp)
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{
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vec3 col = vec3(255.);
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col.x = 56100000. * pow(Temp,(-3. / 2.)) + 148.;
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col.y = 100.04 * log(Temp) - 623.6;
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if (Temp > 6500.) col.y = 35200000. * pow(Temp,(-3. / 2.)) + 184.;
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col.z = 194.18 * log(Temp) - 1448.6;
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col = clamp(col, 0., 255.)/255.;
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if (Temp < 1000.) col *= Temp/1000.;
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return col;
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}
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// -------------blackbody----------------- //
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float scene(vec3 p)
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{
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float d = 10000.;
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float bd1 = sdfBox(
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twistSDF(
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modSDFlim(
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twistSDF(p - vec3(0., 12., 0.), smoothstep(0.30, 0.20, abs(sin(MYTIME))) * 0.02),
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12., vec3(1. + smoothstep(0.45, 0.55, abs(sin(MYTIME))) * floor(abs(mod(MYTIME / (PI), 16.) - 8.)), 1. + smoothstep(0.45, 0.55, abs(sin(MYTIME))) * floor(abs(mod(MYTIME / (PI), 16.) - 8.)), 1. + smoothstep(0.45, 0.55, abs(sin(MYTIME))))), smoothstep(0.70, 0.80, abs(sin(MYTIME))) * -0.1),
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vec3(4. + smoothstep(0.25, 0.75, abs(sin(MYTIME * 2.))),4. + smoothstep(0.25, 0.75, abs(sin(MYTIME * 2.))),4. + smoothstep(0.25, 0.75, abs(sin(MYTIME * 2.)))));
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if (DISPLACEMENT_MAPPING == 1)
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bd1 += sin(p.x / 2. * abs(mod(iTime, 6.) - 3.)) * 1. * sin(p.y / 2. * abs(mod(iTime, 6.) - 3.)) * 1. * sin(p.z / 2. * abs(mod(iTime, 6.) - 3.)) * 1.;
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float bd2 = sdfBox(modSDF(p - vec3(0., -24., 0.), vec3(10., 0., 10.)), vec3(4.5,4.5,4.5)) * 1.;
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d = min(bd1, d);
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d = min(bd2, d);
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return d;
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}
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vec2 march(vec3 ro, vec3 rd)
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{
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float dO = 0.;
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float mind = 10000.;
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for (int steps = 0; steps < MAX_STEPS; steps++)
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{
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vec3 p = ro + rd * dO;
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float dS = scene(p);
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if (steps == 3)
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mind = dS;
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dO += dS;
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if (dS < E || dO > MAX_DIST)
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break;
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}
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return vec2(dO, mind);
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}
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vec3 normal(vec3 p)
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{
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float d = scene(p);
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vec2 e = vec2(0.001, 0);
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vec3 n = d - vec3(
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scene(p - e.xyy),
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scene(p - e.yxy),
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scene(p - e.yyx));
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return (normalize(n));
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}
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float light(vec3 p, vec3 n)
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{
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vec3 lightPos = vec3(-250. * sin(MYTIME), 75., -250. * cos(MYTIME));
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vec3 l = normalize(lightPos - p);
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float dif = clamp(dot(l, n), 0., 1.);
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//vec2 d = march(p+n*E * 30., l);
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//if (d.x < length(lightPos - p))
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// dif *= 0.1;
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return (dif*0.3);
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}
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void mainImage( out vec4 fragColor, in vec2 fragCoord )
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{
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vec2 uv = ((fragCoord - .5 * iResolution.xy) / iResolution.y);
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vec3 ro = vec3(-235. * sin(iTime / 2.), 75. + sin(iTime / 2.) * 15., -235. * cos(iTime / 2.));
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vec3 rd = normalize(vec3(uv.x, uv.y, 1.));
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rd = rotX(rd, PI /8.);
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rd = rotY(rd, iTime / 2.);
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vec2 d = march(ro, rd);
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vec3 p = ro + rd * d.x;
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vec3 n = normal(p);
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p += n * E * 10.;
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float dif = light(p, n);
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vec3 col = vec3(0);
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if (d.x < MAX_DIST * 0.9)
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{
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col = blackbody(d.y* (p.y + 19.2) * 2. * (50. - abs(mod(p.x * p.z / 30. + 25. + MYTIME * 50., 100.) - 50.)));
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col.xyz = col.zyx;
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col.xy *= 0.5;
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col.x *= uv.x;
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col.y *= uv.y;
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if (col.z > 0.001)
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{
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col = 0.5 * (1. - col);
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col = vec3(col.z, col.z, (col.x + col.y) / 2.);
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col.x = col.x / 2. + col.z * uv.x;
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col.y = col.y / 2. + col.z * uv.y;
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}
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col /= 2.;
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}
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col += vec3(dif / 2.,dif / 2., dif / 2.);
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vec3 rr = rd - (2. * n * (dot(rd, n)));
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vec2 d2 = march(p, rr);
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vec3 p2 = p + rr * d2.x;
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vec3 n2 = normal(p2);
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dif = light(p2, n2);
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if (d2.x < MAX_DIST * 0.9)
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{
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vec3 col2 = blackbody(d2.y* (p2.y + 19.2) * 2. * (50. - abs(mod(p2.x * p2.z / 30. + 25. + MYTIME * 50., 100.) - 50.)));
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col2.xyz = col2.zyx;
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col2.xy *= 0.5;
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col2.x *= uv.x;
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col2.y *= uv.y;
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if (col2.z > 0.001)
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{
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col2 = 0.5 * (1. - col2);
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col2 = vec3(col.z, col2.z, (col2.x + col2.y) / 2.);
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col2.x = col2.x / 2. + col2.z * uv.x;
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col2.y = col2.y / 2. + col2.z * uv.y;
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}
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col2 /= 2.;
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col += col2;
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}
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if (d.x < MAX_DIST * 0.9)
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{
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vec3 col2 = blackbody(d2.y* (p.y + 19.2) * 2. * (50. - abs(mod(p.x * p.z / 30. + 25. + MYTIME * 50., 100.) - 50.)));
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col += col2.yxz;
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}
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if (d2.x < MAX_DIST * 0.9)
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{
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vec3 col2 = blackbody(d2.y* (p2.y + 19.2) * 2. * (50. - abs(mod(p2.x * p2.z / 30. + 25. + MYTIME * 50., 100.) - 50.)));
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col += col2.yxz;
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}
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col += vec3(dif / 2., dif / 2., dif / 2.);
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//col = pow(col, vec3(0.454545));
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fragColor = vec4(col, 1.0);
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}
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` |