precision mediump float; uniform vec2 resolution; // resolution (width, height) uniform vec2 mouse; // mouse (0.0 ~ 1.0) uniform float time; // time (1second == 1.0) uniform sampler2D backbuffer; // previous scene const float PI = 3.1415926; const int REFLECT_ITER = 3; const int MENGER_ITER = 3; const int RAY_ITER = 60; const float FAR = 100.0; const float EPS = 0.0001; vec3 hsv(float h, float s, float v){ vec4 t = vec4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0); vec3 p = abs(fract(vec3(h) + t.xyz) * 6.0 - vec3(t.w)); return v * mix(vec3(t.x), clamp(p - vec3(t.x), 0.0, 1.0), s); } mat2 rot(float a){ return mat2(cos(a), sin(a), -sin(a), cos(a)); } vec3 opTwist( in vec3 p ) { const float k = 10.0; // or some other amount float c = cos(k*p.y); float s = sin(k*p.y); mat2 m = mat2(c,-s,s,c); vec3 q = vec3(m*p.xz,p.y); return q; } float blob2(float d1, float d2, float k){ return -log(exp(-k*d1)+exp(-k*d2))/k; } float smin( float a, float b, float k ) { // by iq float h = clamp( 0.5+0.5*(b-a)/k, 0.0, 1.0 ); return mix( b, a, h ) - k*h*(1.0-h); } float sdPlane(vec3 p, float h){ return p.y - h; } float sdBox(vec3 p, vec3 s){ vec3 q = abs(p) - s; return max(max(q.x, q.y), q.z); } float sdRoundBox(vec3 p, vec3 size, float r){ vec3 d = abs(p) - size; return length(max(d, 0.0)) - r; } float sdTorus(vec3 p, vec2 t){ vec2 q = vec2(length(p.xz) - t.x, p.y); return length(q) - t.y; } float sdOctahedron( in vec3 p, in float s) { p = abs(p); return (p.x+p.y+p.z-s)*0.57735027; } float sdBarX(vec3 p, vec2 s){ vec2 q = abs(p.yz) - s; return max(q.x, q.y); } float sdBarZ(vec3 p, vec2 s){ vec2 q = abs(p.xy) - s; return max(q.x, q.y); } float sdSphere(vec3 p, float r){ return length(p) - r; } float sdPoleX(vec3 p, float r){ return length(p.yz) - r; } float sdPoleY(vec3 p, float r){ return length(p.xz) - r; } float sdPoleY2(vec3 p, float r, float w){ return max(length(p.xz) - r, p.y - w); } float sdInfinityDoor(vec3 p, float s, float interbal){ p.z = mod(p.z, interbal) - interbal / 2.0; float d = sdPoleX(p - vec3(0.0, s, 0.0), s); d = min(d, sdBarX(p - vec3(0.0, -s, 0.0), vec2(s * 2.0,s))); return d; } float sdInfinityPole(vec3 p, float s, float interbal){ p.z = mod(p.z, interbal) - interbal / 2.0; float d = sdPoleY(p - vec3(0.0, s, 0.0), s); return d; } float sdTiledFloor(vec3 p, float interbal){ float d; p.xz = mod(p.xz, interbal) - interbal / 2.0; d = sdPlane(p, 0.0); d = max(d, -sdBarX(p - vec3(0.0, 0.0, 0.0), vec2(0.01, 0.01))); d = max(d, -sdBarZ(p - vec3(0.0, 0.0, 0.0), vec2(0.01, 0.01))); return d; } // https://www.shadertoy.com/view/Mlf3Wj vec2 foldRotate(in vec2 p, in float s) { float a = PI / s - atan(p.x, p.y); float n = PI*2.0 / s; a = floor(a / n) * n; p *= rot(a); return p; } float dTree(vec3 p) { //float scale = 0.8 * clamp(1.0 * sin(0.2 * time)/2.0 + 0.5, 0.0, 1.0) + 0.1; float scale = 0.8; float width = mix(0.25 * scale, 0.01, clamp(p.y, 0.0, 1.0)); vec3 size = vec3(width, 1.0, width); p.xz *= rot(0.05); p.yz *= rot(0.5); p.xy *= rot(time*0.078); float d = sdRoundBox(p, size, size.x * 0.15); for (int i = 0; i < 10; i++) { vec3 q = p; //q.yz *= rot(0.4); q.x = abs(q.x); q.y -= 0.5 * size.y; q.yz *= rot(0.3 + sin(time * 0.123) * 0.1 - clamp(float(i) - 2.0, 0.0, 10.0) * 0.1); q.xy *= rot(-1.2); d = min(d, sdRoundBox(p, size, size.x * 0.15)); //d = min(d, sdPoleY2(p, width, width)); p = q; size *= scale; } return d; } float dTree2(vec3 p) { float scale = 0.85; float width = mix(0.25 * scale, 0.02, clamp(p.y, 0.0, 1.0)); vec3 size = vec3(width, 1.0, width); p.xz *= rot(0.05); p.yz *= rot(0.5); p.xy *= rot((time+210.0)*0.078); float d = sdRoundBox(p, size, size.x * 0.15); for (int i = 0; i < 8; i++) { vec3 q = p; q.x = abs(q.x); q.y -= 0.5 * size.y; q.yz *= rot(0.25 + sin(time * 0.123) * 0.1 ); q.xy *= rot(-1.2); d = min(d, sdRoundBox(p, size, size.x * 0.15)); p = q; size *= scale; } return d; } float dSnowCrystal(vec3 p) { vec3 _p = p; _p -= vec3(0.0, -0.5, time + 3.0); _p.yz *= rot(-PI*0.5); _p.yz *= rot(-0.2); //_p = opTwist(_p); // 時間でうごくやつ //_p.xy = foldRotate(_p.xy, clamp(6.0 * sin(0.2 * time)/2.0 + 9.0, 6.0, 12.0)); _p.xy = foldRotate(_p.xy, 6.0); return dTree(_p); } float noise(float _a){ float _noise = sin(-time*3.45+_a); return _noise; } vec2 pmod(vec2 p, float r) { float a = atan(p.x, p.y) + PI/r; float n = PI*2.0 / r; a = floor(a/n)*n; return p*rot(-a); } float sdCylinder( vec3 p, vec3 c ) { return length(p.xz-c.xy)-c.z; } float sdCappedCylinder( vec3 p, vec2 h ) { vec2 d = abs(vec2(length(p.xz),p.y)) - h; return min(max(d.x,d.y),0.0) + length(max(d,0.0)); } float dBar(vec2 p, float width) { vec2 d = abs(p) - width; return min(max(d.x, d.y), 0.0) + length(max(d, 0.0)) + 0.01 * width; } float _ScaleAmount = 0.6; float _PolerAmount = 6.0; float _AnimAmount = 6.0; float _AngleAmount = 0.05; float _LengthAmount = 0.46; float _WidthAmount = 0.4; float _WidthDecay = 0.852; float _BranchAmount = 0.67; float _BranchPos = 1.6; float Branch(vec3 p) { //float scale = 0.8 * clamp(1.0 * sin(0.2 * _Time)/2.0 + 0.5, 0.0, 1.0) + 0.1; float scale = _BranchAmount; // float width = _WidthAmount * scale; vec3 size = vec3(width, _LengthAmount, width / 10.0 * _ScaleAmount); vec3 _p = p; _p.xz = _p.xz * rot(0.2); _p.yz = _p.yz * rot(0.4); _p.xy = _p.xy * rot(sin(time * 0.078 * _AnimAmount) * 0.2); //float d = sdBox(_p, size); float d = sdRoundBox(_p, size, size.x * 0.15); for (int i = 0; i < 8; i++) { vec3 q = _p; q.x = abs(q.x); q.y -= size.y * _BranchPos; q.yz = q.yz * rot(0.4 + sin(time * 0.123) * 0.1 - clamp(float(i) - 2.0, 0.0, 10.0) * 0.2); q.xy = q.xy * rot(_AngleAmount); //d = min(d, sdBox(q, size)); d = min(d, sdRoundBox(q, size, size.x * 0.15)); _p = q; size *= scale; size.x *= _WidthDecay; //size *= vec3(_BranchAmount, 1.0, _BranchAmount); } return d; } float Branch2(vec3 p) { float scale = _BranchAmount; float width = _WidthAmount * scale; vec3 size = vec3(width, _LengthAmount, width / 10.0) * _ScaleAmount; vec3 _p = p; _p.xz = _p.xz * rot(0.2); _p.yz = _p.yz * rot(0.5); _p.xy = _p.xy * rot(sin((time+210.0)*0.078 * _AnimAmount) * 0.2); //float d = sdBox(_p, size); float d = sdRoundBox(_p, size, size.x * 0.15); for (int i = 0; i < 8; i++) { vec3 q = _p; q.x = abs(q.x); q.y -= size.y * _BranchPos; q.yz = q.yz * rot(0.4 + sin((time+3.0) * 0.123) * 0.1 - clamp(float(i) - 1.0, 0.0, 10.0) * 0.125); q.xy = q.xy * rot(_AngleAmount); //d = min(d, sdBox(q, size)); d = min(d, sdRoundBox(q, size, size.x * 0.15)); _p = q; size *= scale; size.x *= _WidthDecay; } return d; } float dRose(vec3 p) { vec3 _p = p; _p -= vec3(0.0, -0.5, 0.0) * _ScaleAmount + vec3(0.0, 0.0, time+3.0); _p.xz = _p.xz * rot(-time * 0.012 * _AnimAmount); _p.yz = _p.yz * rot(-PI*0.5); _p.xy = pmod(vec2(_p.x,_p.y), _PolerAmount); return Branch(_p); } float dRose2(vec3 p) { vec3 _p = (p - vec3(0.0, 0.0, time+3.0)) * 0.8; _p -= vec3(0.0, -0.5, 0.0) * _ScaleAmount; _p.xz = _p.xz * rot(time * 0.016 * _AnimAmount); _p.yz = _p.yz * rot(-PI*0.5); _p.xy = pmod(vec2(_p.x,_p.y), _PolerAmount); return Branch2(_p); } float sdPointLight(vec3 p, vec3 lightPos){ float d = FAR; vec3 _p = p; _p.xy *= rot(time*0.25); d = min(d, sdSphere(_p - lightPos, 0.02)); _p.xz *= rot(120.0*PI/180.0); d = min(d, sdSphere(_p - lightPos, 0.02)); _p.xz *= rot(120.0*PI/180.0); d = min(d, sdSphere(_p - lightPos, 0.02)); return d; } float map(vec3 p){ float d = FAR; // 左右壁 //d = min(d, abs(p.x + 1.5) - 0.1); //d = min(d, abs(1.5 - p.x) - 0.1); // 天井 d = min(d, 2.0 - p.y); // 天井凹み //d = max(d, -sdBarZ(p - vec3(0.0, 2.0, 0.0), vec2(1.0, 0.2))); //d = max(d, -sdInfinityDoor(p - vec3(0.0, 0.8, 0.0), 0.4, 1.5)); //d = min(d, sdInfinityPole(p - vec3(-1.2, 0.0, 0.0 + 0.75), 0.1, 1.5)); //d = min(d, sdInfinityPole(p - vec3(1.2, 0.0, 0.0 + 0.75), 0.1, 1.5)); // タイル地面 d = min(d, sdTiledFloor(p - vec3(0.0, -1.0, 0.0), 0.3)); //d = min(d, dSnowCrystal(p)); d = min(d, dRose(p)); d = min(d, dRose2(p)); float _halfSphere = max(sdSphere(p - vec3(0.0, -0.35, 0.0) * _ScaleAmount - vec3(0.0,0.0,time+3.0), 0.25 * _ScaleAmount), p.y - (-0.4 * _ScaleAmount)); d = smin(d, _halfSphere, 0.1); // 水 float _water = max(sdPlane(p - vec3(0.0, 1.4, 0.0), sin(-time*10.0+length(p - vec3(0.0, 0.0, time + 3.0))*50.0) * 0.005 - 1.5), sdSphere(p - vec3(0.0, 0.2, time + 3.0), 0.5)); d = min(d, _water); // 水滴 d = blob2(d, sdSphere(p - vec3(0.0, mod(-time*0.5, 4.0) - 2.0, time + 3.0), -length(mod(-time*0.5, 4.0) - 2.0) * 0.1 + 0.1), 15.0); return d; } vec3 calcN(vec3 p){ vec2 e =vec2(EPS, 0.0); vec3 n = normalize(vec3( map(p+e.xyy)-map(p-e.xyy), map(p+e.yxy)-map(p-e.yxy), map(p+e.yyx)-map(p-e.yyx) )); return n; } float calcAO(vec3 p, vec3 n, float len, float power){ vec3 aoPos = p; float occ = 0.0; for(int i = 0; i < 3; i++){ aoPos = p + n * len / 3.0 * float(i+1); float d = map(aoPos); occ += (len - d) * power; power *= 0.5; } return clamp(1.0 - occ, 0.0, 1.0); } float calcBloom(vec3 cam, vec3 ray, float endDepth){ float bloom = 0.0; float depth = 0.0; for(int i = 0; i < RAY_ITER; i++){ vec3 p = cam + ray * depth; // 浮遊光 float d; d = sdPointLight(p - vec3(0.0, 0.6, 3.0 + time), vec3(sin(time) * 0.23, sin(time*2.0) * 0.14, cos(time) * 0.34)); p.z = mod(p.z, 4.0) - 2.0; d = min(d, sdSphere(p - vec3(0.0, 2.0, 0.0), 0.05)); bloom += exp(-d*0.25); if(depth > endDepth) break; depth += d; } return bloom / float(RAY_ITER); } vec3 draw(vec3 camPos, vec3 rayDirection, out vec3 rayPos, out vec3 normal, out bool hit){ vec3 col = vec3(0.0); float depth = 0.0; float dist; for(int i = 0; i < RAY_ITER; i++){ rayPos = camPos + rayDirection * depth; dist = map(rayPos); if(depth > FAR || dist < EPS){ normal = calcN(rayPos); break; } depth += dist; } col = vec3(1.0) / 2.0; //col = hsv(depth / 5.0, 1.0, 1.0); // リムライト float distAmount = smoothstep(FAR, EPS, depth); col += pow(1.0 - dot(normal, -rayDirection), 1.0) * vec3(0.5, 0.5, 1.0) * distAmount;//hsv(time * 0.2, 1.0, 0.2) //col += pow(1.0 - dot(normal, -rayDirection), 0.5) * vec3(0.2, 0.2, 1.0) * hsv(time * 0.2, 1.0, 0.2); col *= max(dot(normal, vec3(1.0, 1.0, 1.0) * 1.0), 0.5); col *= max(depth / FAR, 0.1); col *= calcAO(rayPos, normal, 0.5, 1.0); col += vec3(1.0, 0.5, 0.7) * calcBloom(camPos, rayDirection, depth) * 5.0; hit = dist < EPS; return col; } vec3 canvas(vec2 uv){ vec3 col = vec3(0.0); vec3 normal = vec3(0.0); vec3 camPos = vec3(cos(time / 2.0) * 0.1, sin(time / 3.0) * 0.1 + 0.75, time + 1.0); vec3 rayDirection = normalize(vec3(uv.x, uv.y - 0.5 + sin(time / 5.0) * 0.2, 1.0)); vec3 rayPos = camPos; float depth = 0.0; bool hit = false; float alpha = 1.0; vec3 reflectColor = vec3(1.2, 0.8, 1.0); for(int i = 0; i < REFLECT_ITER; i++){ col += draw(camPos, rayDirection, rayPos, normal, hit) * reflectColor; rayDirection = normalize(reflect(rayDirection, normal)); camPos = rayPos + normal * EPS; //alpha *= 0.8; if(!hit)break; } return col; } void main(){ vec2 uv = (gl_FragCoord.xy * 2.0 - resolution.xy) / min(resolution.x, resolution.y); vec3 col; col = canvas(uv); gl_FragColor = vec4(col, 1.0); }

#unity