/* references - - http://blog.hvidtfeldts.net/index.php/2011/11/distance-estimated-3d-fractals-vi-the-mandelbox/ - https://www.shadertoy.com/view/XscyD2 - https://www.shadertoy.com/view/lsKcDD */ precision highp float; uniform vec2 resolution; uniform float time; #define minRadius2 1.5 #define fixedRadius2 4.0 void sphereFold(inout vec3 p, inout float dz) { float r2 = dot(p, p); if (r2tmax ) break; } return clamp( res, 0.0, 1.0 ); } float calcAO( in vec3 pos, in vec3 nor ) { float occ = 0.0; float sca = 1.0; for( int i=0; i<5; i++ ) { float h = 0.001 + 0.15*float(i)/4.0; float d = map( pos + h*nor ).x; occ += (h-d)*sca; sca *= 0.95; } return clamp( 1.0 - 1.5*occ, 0.0, 1.0 ); } vec3 render(in vec3 ro, in vec3 rd) { vec2 res = rayMarch(ro, rd); float d=res.x, m=res.y; if(m<0.) return vec3(0.); vec3 pos = ro+rd*d; vec3 nor = calcNormal(pos); vec3 ref = reflect(rd, nor); vec3 lp = ro + vec3(0.); vec3 ld = normalize(vec3(1.)); ld = normalize(lp - pos); vec3 material = vec3(1.2, 1.1, .8); vec3 color = material; float dif = diffuse(nor, ld, 1.); float sha = calcSoftshadow(pos, ld, 0.01, 0.3); float spe = specular(ref, ld, 10.); color *= dif * sha; color += spe; float occ = calcAO(pos, nor); float amb = clamp(0.5+0.5*nor.y, 0., 1.); color += amb*occ*vec3(0.5, 0.3, 0.1); return color; } void main() { vec2 uv = gl_FragCoord.xy/resolution.xy; vec2 p = (gl_FragCoord.xy*2.-resolution.xy) / min(resolution.x, resolution.y); vec3 ro = 7.0*sin(10.+time*vec3(0.07, 0.09, 0.05)); vec3 tar = vec3(0.); vec3 cz = normalize(tar - ro); float cr = time*0.1; vec3 cx = normalize(cross(cz, vec3(sin(cr), cos(cr), 0.))); vec3 cy = normalize(cross(cx, cz)); vec3 rd = normalize(mat3(cx, cy,cz) * vec3(p, 2.)); vec3 col = render(ro, rd); gl_FragColor = vec4(col,1.0); }

My Mandelbox 1