URL: http://glslsandbox.com/e#20310.0
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// Simple Ray Marcher // Morphing Ray Marched Cube // 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 = 100; mat4 transpose( mat4 m ) { mat4 t = mat4( vec4( m[0][0], m[1][0], m[2][0], m[3][0] ), vec4( m[0][1], m[1][1], m[2][1], m[3][1] ), vec4( m[0][2], m[1][2], m[2][2], m[3][2] ), vec4( m[0][3], m[1][3], m[2][3], m[3][3] ) ); return t; } mat4 invert( mat4 mat ) { vec3 right = vec3( mat[0][0], mat[0][1], mat[0][2] ); vec3 up = vec3( mat[1][0], mat[1][1], mat[1][2] ); vec3 fwd = vec3( mat[2][0], mat[2][1], mat[2][2] ); vec3 pos = vec3( mat[3][0], mat[3][1], mat[3][2] ); mat4 t = transpose( mat ); t[0][3] = -dot(right, pos); t[1][3] = -dot(right, pos); t[2][3] = -dot(right, pos); return t; } float smin( float a, float b, float k ) { float res = exp( -k*a ) + exp( -k*b ); return -log( res )/k; } float cube( vec3 ray, float r, mat4 transform ) { vec3 rayPrime = vec3(transpose( transform ) * vec4(ray,1)); float d = length(max(abs(rayPrime)-vec3(0.5,0.5,0.5),0.0))-r; return d; } float sphere( vec3 ray, float r, mat4 transform ) { vec3 rayPrime = vec3(invert( transform ) * vec4(ray,1)); float d = length(rayPrime)-r; return d; } float torus( vec3 ray, vec2 t, mat4 transform ) { vec3 rayPrime = vec3(invert( transform ) * vec4(ray,1)); vec2 q = vec2(length(rayPrime.xz)-t.x,rayPrime.y); return length(q)-t.y; } float SceneDist( vec3 ray ) { float t = time; float c = cos( t ); float s = sin( t ); mat4 rotX = mat4( vec4(1,0,0,0), vec4(0,c,-s,0), vec4(0,s,c,0), vec4(0,0,0,1) ); mat4 rotY = mat4( vec4(c,0,-s,0), vec4(0,1,0,0), vec4(s,0,c,0), vec4(0,0,0,1) ); mat4 rotZ = mat4( vec4(c,s,0,0), vec4(-s,c,0,0), vec4(0,0,1,0), vec4(0,0,0,1) ); mat4 pos = mat4( vec4(1,0,0,s*1.0), vec4(0,1,0,0), vec4(0,0,1,c*1.0), vec4(0,0,0,1) ); mat4 transform = pos * rotZ * rotY * rotY; float d1 = cube( ray, 0.15, transform ); //float d2 = sphere( ray, 0.5, transform ); float d2 = torus( ray, vec2(0.7, 0.1), transform); float tVal = sin(time)*0.5+0.5; float final = mix(d1,d2, tVal); return final; } vec3 getNormal(vec3 pos){ // this gets the normal // if you understand, good. if not, not much I can do. vec2 eps = vec2(0.0, EPS); return normalize(vec3( // always normalise directions 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 hsv(float h,float s,float v) { // this is just a hue/saturation/luminance to RGB conversion return mix(vec3(1.),clamp((abs(fract(h+vec3(3.,2.,1.)/3.)*6.-3.)-1.),0.,1.),s)*v; } 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, halfDir ), 0.0, 1.0), 2.0 ); 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( sin(time) * 3.0, 0.0, cos(time) * 3.0); 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 ) { float t = sin(time)*0.5+0.5; vec3 diffuse = mix( vec3(1.0,0.0,0.0), vec3(1.0,1.0,0.0), t); color = Lighting( camPos, dest, getNormal( dest ), diffuse ); } else { vec2 p = floor( time + gl_FragCoord.xy/resolution.x*10.0 ); float s = mod( p.x + p.y, 2.0 ); vec3 bg0 = vec3(s,s,s); vec3 bg1 = hsv(.55,smoothstep(-1.5,1.,uv.y),1.); float t = sin(time) * 0.5 + 0.5; color = mix( bg0, bg1, t); } 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); } |