URL: http://glslsandbox.com/e#24403.1
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// Raymarched Liquid Sphere // By: Brandon Fogerty // bfogerty at gmail dot com // xdpixel.com #ifdef GL_ES precision mediump float; #endif uniform float time; uniform vec2 mouse; uniform vec2 resolution; #ifdef GL_ES precision mediump float; #endif const float EPS = 0.01; const int MAXI = 35; float hash( float x ) { return fract( sin( x ) * 43758.5453 ); } float noise( vec2 uv ) // Thanks Inigo Quilez { vec3 x = vec3( uv.xy, 0.0 ); vec3 p = floor( x ); vec3 f = fract( x ); f = f*f*(3.0 - 2.0*f); float offset = 57.0; float n = dot( p, vec3(1.0, offset, offset*2.0) ); return mix( mix( mix( hash( n + 0.0 ), hash( n + 1.0 ), f.x ), mix( hash( n + offset), hash( n + offset+1.0), f.x ), f.y ), mix( mix( hash( n + offset*2.0), hash( n + offset*2.0+1.0), f.x), mix( hash( n + offset*3.0), hash( n + offset*3.0+1.0), f.x), f.y), f.z); } float snoise( vec2 uv ) { return noise( uv ) * 2.0 - 1.0; } float fbm( vec2 uv, float lacunarity, float gain ) { float sum = 0.0; float amp = 0.3; for( int i = 0; i < 2; ++i ) { sum += ( snoise( uv ) ) * amp; amp *= gain; uv *= lacunarity; } return sum; } float sphere( vec3 ray, float r ) { float d = length(ray)-r; float t = time * 0.1; d += fbm( vec2( cos(ray.x+time)*ray.x+t, sin(ray.y+time)*ray.y+t ), 10.1, 0.1 ); return d; } float SceneDist( vec3 ray ) { float d = sphere( ray, 1.0 ); return d; } vec3 getNormal(vec3 pos) { vec2 eps = vec2(0.0, EPS); return normalize(vec3( SceneDist(pos + eps.yxx) - SceneDist(pos - eps.yxx), SceneDist(pos + eps.xyx) - SceneDist(pos - eps.xyx), SceneDist(pos + eps.xxy) - SceneDist(pos - eps.xxy))); } vec3 Lighting( vec3 camPos, vec3 pos, vec3 normal, vec3 diffuseColor ) { vec3 lightPos = vec3(0,0,10); vec3 lightDir = normalize( lightPos - pos ); vec3 viewDir = normalize( camPos - pos ); vec3 lightAmbientColor = vec3(0.1,0.1,0.1); vec3 lightSpecularColor = vec3(1,1,1); vec3 halfDir = normalize(viewDir + lightDir); float lightSpecularIntensity = pow( clamp(dot( normal, reflect(lightDir, normal )), 0.0, 1.0), 80.0 ); float lightDiffuseIntensity = clamp( dot( -normalize(pos), lightDir ), 0.00, 1.0); return lightAmbientColor + (lightDiffuseIntensity * diffuseColor) + (lightSpecularIntensity * lightSpecularColor); } vec3 RenderScene( vec2 uv ) { vec3 color = vec3(1,0,0); vec3 camPos = vec3(0,0,-3); vec3 camTarget = vec3(0.0, 0.0, 0.0); vec3 camUp = vec3(0,1.0,0); vec3 camFwd = normalize( camTarget - camPos ); vec3 camRight = normalize( cross( camUp, camFwd ) ); camUp = normalize( cross( camRight, camFwd ) ); float dist = SceneDist( camPos ); float total = dist; vec3 rayDir = vec3( normalize( camFwd + camRight * uv.x + camUp * uv.y ) ); for(int i=0; i < MAXI; ++i) { dist = SceneDist( camPos + rayDir * total ); total += dist; if( dist <= EPS ) { break; } } vec3 dest = camPos + rayDir * total; if( dist <= EPS ) { vec3 normal = getNormal( dest ); vec3 c0 = vec3(0.1,0.5,1.4)*0.3; vec3 c1 = vec3(0.1,1.4,0.2); vec3 diffuse = c0+normal.x + c1+normal.y; color = Lighting( camPos, dest, normal, diffuse ); } else { color = vec3(1.0) * length( uv ); } return color; } void main(void) { vec2 uv = ((gl_FragCoord.xy / resolution.xy) - 0.5) * vec2(2.0, 2.0 * resolution.y / resolution.x); vec3 color = RenderScene( uv ); // Scan line color -= mod(gl_FragCoord.y, 2.0) < 1.0 ? 0.5 : 0.0; gl_FragColor = vec4(color, 1.0); } |