The Tidal Cathedral

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params (5)

Camera drift 0.65

Sun elevation 0.27

Valley mist 0.50

Water motion 0.60

Exposure 0.95

.fs source · isf not running

/*{
  "DESCRIPTION": "THE TIDAL CATHEDRAL — an original procedural fjord at first light. A monumental sea-carved arch, glacial peaks, conifer groves, a distant cascade, rippled reflections, wind-driven clouds and circling birds. All geometry, materials and light are synthesized here. The first pass generates a reusable noise lattice; no imported textures or external assets.",
  "CREDIT": "OpenAI / Codex",
  "ISFVSN": "2",
  "CATEGORIES": ["Landscape", "Raymarching"],
  "PASSES": [
    { "TARGET": "geologyNoise", "PERSISTENT": true },
    {}
  ],
  "INPUTS": [
    { "NAME": "cameraDrift", "LABEL": "Camera drift", "TYPE": "float", "DEFAULT": 0.65, "MIN": 0.0, "MAX": 1.0 },
    { "NAME": "sunHeight", "LABEL": "Sun elevation", "TYPE": "float", "DEFAULT": 0.27, "MIN": 0.12, "MAX": 0.85 },
    { "NAME": "atmosphere", "LABEL": "Valley mist", "TYPE": "float", "DEFAULT": 0.5, "MIN": 0.0, "MAX": 1.5 },
    { "NAME": "waterMotion", "LABEL": "Water motion", "TYPE": "float", "DEFAULT": 0.6, "MIN": 0.0, "MAX": 1.5 },
    { "NAME": "exposure", "LABEL": "Exposure", "TYPE": "float", "DEFAULT": 0.95, "MIN": 0.6, "MAX": 1.6 }
  ]
}*/

#define FAR 290.0
const mat2 TURN = mat2(0.80, -0.60, 0.60, 0.80);

float hash12(vec2 p) {
    vec3 q = fract(vec3(p.xyx) * 0.1031);
    q += dot(q, q.yzx + 33.33);
    return fract((q.x + q.y) * q.z);
}

float hash13(vec3 p) {
    p = fract(p * 0.1031);
    p += dot(p, p.zyx + 31.32);
    return fract((p.x + p.y) * p.z);
}

float noise2(vec2 p) {
    vec2 i = floor(p), f = fract(p);
    f = f * f * (3.0 - 2.0 * f);
    vec2 at = mod(i + 32.0, 64.0) + 0.5;
    float a = IMG_PIXEL(geologyNoise, at).g;
    float b = IMG_PIXEL(geologyNoise, at + vec2(1,0)).g;
    float c = IMG_PIXEL(geologyNoise, at + vec2(0,1)).g;
    float d = IMG_PIXEL(geologyNoise, at + vec2(1,1)).g;
    return mix(mix(a,b,f.x),mix(c,d,f.x),f.y);
}

float noise3(vec3 p) {
    vec3 i = floor(p), f = fract(p);
    f = f * f * (3.0 - 2.0 * f);
    i = mod(i, 16.0);
    vec2 tile0 = vec2(mod(i.z, 4.0), floor(i.z / 4.0));
    vec2 at = tile0 * 18.0 + i.xy + 1.5;
    vec2 a = IMG_PIXEL(geologyNoise, at).rb;
    vec2 b = IMG_PIXEL(geologyNoise, at + vec2(1,0)).rb;
    vec2 c = IMG_PIXEL(geologyNoise, at + vec2(0,1)).rb;
    vec2 d = IMG_PIXEL(geologyNoise, at + vec2(1,1)).rb;
    vec2 pair = mix(mix(a,b,f.x),mix(c,d,f.x),f.y);
    return mix(pair.x, pair.y, f.z);
}

float fbm2(vec2 p) {
    float v = 0.0, a = 0.5;
    for (int i = 0; i < 5; i++) {
        v += a * noise2(p);
        p = TURN * p * 2.07 + vec2(17.4, 9.2);
        a *= 0.48;
    }
    return v;
}

float fbm3(vec3 p) {
    float v = 0.0, a = 0.5;
    for (int i = 0; i < 4; i++) {
        v += a * noise3(p);
        p = p.yzx * 2.03 + vec3(11.7, 4.3, 8.1);
        a *= 0.48;
    }
    return v;
}

float ridge(vec2 p) {
    float v = 0.0, a = 0.55, weight = 1.0;
    for (int i = 0; i < 4; i++) {
        float r = 1.0 - abs(2.0 * noise2(p) - 1.0);
        r *= r;
        v += a * r * weight;
        weight = clamp(r * 1.8, 0.15, 1.0);
        p = TURN * p * 2.11 + 3.7;
        a *= 0.49;
    }
    return v;
}

float riverPath(float z) {
    return 4.0 + 5.0 * sin(z * 0.045) - 12.0 * smoothstep(42.0, 80.0, z);
}

float terrain(vec2 p) {
    float channel = riverPath(p.y);
    float bank = smoothstep(9.0, 25.0, abs(p.x - channel));
    float back = smoothstep(42.0, 80.0, p.y);
    float r = ridge(p * 0.035 + vec2(2.8, 7.3));
    float h = -2.7 + bank * (3.8 + 12.0 * fbm2(p * 0.085));
    float peaks = max(0.0, 1.0 - length((p - vec2(-39.0, 105.0)) * vec2(0.020, 0.019))) * 48.0;
    peaks = max(peaks, max(0.0, 1.0 - length((p - vec2(43.0, 123.0)) * vec2(0.021, 0.016))) * 57.0);
    peaks = max(peaks, max(0.0, 1.0 - length((p - vec2(-5.0, 178.0)) * vec2(0.014, 0.015))) * 72.0);
    peaks = max(peaks, max(0.0, 1.0 - length((p - vec2(-89.0, 152.0)) * vec2(0.020, 0.016))) * 61.0);
    h += back * (4.0 + peaks * (0.72 + 0.48 * r) + 5.0 * r);
    h *= 1.0 - 0.55 * exp(-abs(p.x - channel) * 0.3) * back;
    vec2 nearRock = (p - vec2(-11.0, -13.0)) / vec2(9.5, 11.0);
    h += 7.5 * exp(-dot(nearRock, nearRock) * 1.5);
    h += 0.12 * noise2(p * 2.8);
    return h;
}

// Elliptical stone vault, leaned and twisted once in world space.
// The enclosing box avoids evaluating erosion noise outside the arch's region.
float arch(vec3 p) {
    vec3 q = p - vec3(-7.0, 2.0, 27.0);
    vec3 b = abs(q) - vec3(21.0, 24.0, 9.0);
    float bound = length(max(b, 0.0));
    if (bound > 2.0) return bound + 0.2;
    q.x += q.y * 0.15 + sin(q.y * 0.24) * 0.65;
    q.z += q.x * 0.15;
    q.y += sin(q.x * 0.19) * 1.1;
    float thick = 2.15 + 1.1 * (1.0 - smoothstep(-12.0, 0.0, q.x)) + 0.65 * noise3(p * 0.17);
    float d = length(vec2(length(q.xy * vec2(1.0, 0.76)) - 12.0, q.z * 1.3)) - thick;
    d += (noise3(p * 0.46) - 0.5) * 1.65;
    d += (noise3(p * 1.7) - 0.5) * 0.28;
    return d * 0.40;
}

vec2 scene(vec3 p) {
    float ground = terrain(p.xz);
    float land = (p.y - ground) * 0.23;
    float vault = arch(p);
    vec2 res = land < vault ? vec2(land, 1.0) : vec2(vault, 2.0);
    if (p.y - ground < 4.2 && p.y < 21.0 && p.z > -5.0 && p.z < 94.0) {
        vec2 cell = floor(p.xz / 2.2);
        float seed = hash12(cell + 13.5);
        vec2 center = (cell + 0.5) * 2.2;
        center += vec2(seed - 0.5, hash12(cell + 8.1) - 0.5) * 0.6;
        float base = terrain(center);
        if (base > 1.2 && base < 10.5 && seed > 0.32 && noise2(center * 0.15) > 0.37) {
            float ht = 0.85 + seed * 1.4;
            vec3 q = p - vec3(center.x, base - 0.2, center.y);
            q.x += 0.04 * sin(q.y * 3.0 + seed * 8.0);
            float radius = 0.59 * max(1.0 - q.y / ht, 0.0);
            radius *= 0.84 + 0.12 * sin(q.y * 16.0 + seed * 8.0) + 0.12 * noise3(q * 13.0);
            float tree = max(length(q.xz) - radius, max(-q.y, q.y - ht)) * 0.45;
            if (tree < res.x) res = vec2(tree, 3.0);
        }
    }
    return res;
}

vec2 trace(vec3 ro, vec3 rd, float limit, bool reflected) {
    float t = 0.06;
    float mat = -1.0;
    for (int i = 0; i < 220; i++) {
        vec2 h = scene(ro + rd * t);
        float eps = max(0.004, t * (reflected ? 0.0014 : 0.00055));
        if (h.x < eps) { mat = h.y; break; }
        t += max(h.x * 0.91, 0.008);
        if (t > limit || (reflected && i > 145)) break;
    }
    return vec2(min(t, limit), mat);
}

vec3 normalAt(vec3 p, float t) {
    float e = max(0.008, t * 0.00035);
    vec3 n = vec3(0.0);
    for (int i = 0; i < 4; i++) {
        vec3 k = i == 0 ? vec3(1,-1,-1) : (i == 1 ? vec3(-1,-1,1) : (i == 2 ? vec3(-1,1,-1) : vec3(1,1,1)));
        n += k * scene(p + k * e).x;
    }
    return normalize(n);
}

vec3 sunDirection() { return normalize(vec3(-0.65, sunHeight, -0.50)); }

float shadowAt(vec3 p, vec3 lightDir) {
    float sh = 1.0, t = 0.13;
    for (int i = 0; i < 36; i++) {
        float h = scene(p + lightDir * t).x;
        sh = min(sh, 12.0 * max(h, 0.0) / t);
        t += clamp(h, 0.12, 4.0);
        if (sh < 0.015 || t > 65.0) break;
    }
    return clamp(sh, 0.0, 1.0);
}

vec3 sky(vec3 rd, bool clouds) {
    vec3 sd = sunDirection();
    float y = max(rd.y, 0.0);
    float sun = max(dot(rd, sd), 0.0);
    vec3 horizon = mix(vec3(0.48,0.60,0.67), vec3(0.82,0.56,0.34), smoothstep(0.15,-0.8,rd.x) * 0.8);
    vec3 col = mix(horizon, vec3(0.018, 0.085, 0.19), pow(y, 0.42));
    col += vec3(1.0, 0.49, 0.19) * pow(sun, 8.0) * 0.32;
    col += vec3(1.0, 0.65, 0.28) * pow(sun, 70.0) * 0.4;
    col += vec3(9.0, 6.4, 3.6) * smoothstep(0.9995, 0.99985, sun);
    if (clouds && rd.y > 0.015) {
        float trans = 1.0;
        vec3 cloudCol = vec3(0.0);
        float start = 70.0 / rd.y;
        float stride = 22.0 / (rd.y * 9.0);
        for (int i = 0; i < 9; i++) {
            vec3 p = rd * (start + (float(i) + 0.5) * stride);
            p.x += TIME * 0.7;
            vec3 cp = p * vec3(0.010, 0.035, 0.010);
            float shape = fbm3(cp * 1.5 + vec3(1.1, 0, 3.0));
            float edge = smoothstep(70.0, 76.0, p.y) * (1.0 - smoothstep(84.0, 92.0, p.y));
            float den = smoothstep(0.46, 0.66, shape) * edge;
            float a = (1.0 - exp(-den * stride * 0.16)) * smoothstep(0.03, 0.19, rd.y);
            float rim = pow(sun, 12.0);
            vec3 lighting = mix(vec3(0.25, 0.33, 0.42), vec3(0.95, 0.87, 0.76), clamp(0.45 + (0.59 - shape) * 3.0 + rim * 0.5, 0.0, 1.0));
            cloudCol += trans * a * lighting;
            trans *= 1.0 - a;
        }
        col = col * trans + cloudCol;
        // High, stretched cirrus adds a second scale to the sky.
        vec2 cp = rd.xz / max(rd.y, 0.05) * vec2(0.9, 4.5) + vec2(TIME * 0.006, 0);
        float veil = smoothstep(0.55, 0.76, fbm2(cp));
        col = mix(col, vec3(0.91, 0.9, 0.85), veil * 0.22);
    }
    return col;
}

vec3 haze(vec3 col, vec3 ro, vec3 rd, float t) {
    float dy = rd.y * 0.10;
    float integral = abs(dy) < 0.0001 ? t : (1.0 - exp(-dy * t)) / dy;
    float mist = integral * exp(-max(ro.y, 0.0) * 0.10);
    float optical = t * 0.0014 + atmosphere * 0.006 * max(mist, 0.0);
    float lit = pow(max(dot(rd, sunDirection()), 0.0), 6.0);
    vec3 air = mix(vec3(0.32, 0.50, 0.59), vec3(1.1, 0.82, 0.50), lit * 0.72);
    return mix(col, air, 1.0 - exp(-optical));
}

vec3 shadeRock(vec3 p, vec3 rd, float t, float material, bool reflected) {
    vec3 n = normalAt(p, t);
    vec3 sd = sunDirection();
    if (material > 2.5) {
        float sh = shadowAt(p + n * 0.12, sd);
        float needle = noise3(p * 18.0);
        vec3 green = mix(vec3(0.018, 0.038, 0.021), vec3(0.080, 0.115, 0.041), needle);
        vec3 light = vec3(0.32, 0.47, 0.58) + vec3(1.5, 1.05, 0.54) * max(dot(n, sd), 0.0) * sh;
        light += vec3(0.28, 0.36, 0.12) * pow(max(dot(rd, sd), 0.0), 3.0);
        return green * light;
    }
    // Microrelief is tangential, preserving the vault's geometric silhouette.
    float be = 0.035;
    vec3 bump = vec3(noise3((p + vec3(be,0,0)) * 7.0) - noise3((p - vec3(be,0,0)) * 7.0),
                     noise3((p + vec3(0,be,0)) * 7.0) - noise3((p - vec3(0,be,0)) * 7.0),
                     noise3((p + vec3(0,0,be)) * 7.0) - noise3((p - vec3(0,0,be)) * 7.0));
    n = normalize(n - (bump - n * dot(bump, n)) * 0.65 / (1.0 + t * 0.009));
    float grain = fbm3(p * vec3(1.3, 1.8, 1.3));
    float layer = sin(p.y * 5.2 + noise3(p * 0.42) * 8.0 + p.x * 0.3);
    float fine = noise3(p * 13.0);
    vec3 stone = mix(vec3(0.10, 0.095, 0.08), vec3(0.46, 0.33, 0.21), grain);
    stone *= 0.83 + 0.26 * smoothstep(-0.85, 0.15, layer) + 0.15 * fine;
    float cracks = smoothstep(0.025, 0.12, abs(sin(p.y * 2.9 + noise3(p * 0.58) * 5.0)));
    stone *= 0.72 + 0.28 * cracks;
    float moss = smoothstep(0.38, 0.82, n.y + (grain - 0.5) * 0.65);
    moss *= 1.0 - smoothstep(19.0, 29.0, p.y);
    vec3 vegetation = mix(vec3(0.035, 0.07, 0.014), vec3(0.18, 0.24, 0.045), grain);
    stone = mix(stone, vegetation, moss * 0.95);
    float snowLine = p.y - 25.0 + 5.0 * fbm2(p.xz * 0.16);
    float snow = smoothstep(0.0, 4.0, snowLine) * smoothstep(0.38, 0.83, n.y + (grain - 0.5) * 0.35);
    if (material > 1.5) snow = 0.0;
    stone = mix(stone, vec3(0.62, 0.72, 0.79), snow);
    float wet = 1.0 - smoothstep(0.15, 1.7, p.y);
    stone *= 1.0 - wet * 0.5;
    float ao = 1.0;
    if (!reflected) {
        float occ = 0.0;
        for (int i = 1; i <= 3; i++) {
            float s = float(i) * 0.65;
            occ += max(0.0, s - scene(p + n * s).x / 0.4) / exp2(float(i));
        }
        ao = clamp(1.0 - occ * 0.45, 0.3, 1.0);
    }
    float sh = shadowAt(p + n * 0.09, sd);
    float diffuse = max(dot(n, sd), 0.0) * sh;
    vec3 ambient = vec3(0.25, 0.38, 0.53) * (0.38 + 0.62 * max(n.y, 0.0)) * ao;
    ambient += vec3(0.13, 0.17, 0.12) * max(0.0, -n.y + 0.25);
    vec3 col = stone * (ambient + vec3(2.2, 1.30, 0.65) * diffuse);
    float stream = (1.0 - smoothstep(0.28, 0.72, abs(p.x - riverPath(p.z)))) * smoothstep(52.0, 58.0, p.z) * (1.0 - smoothstep(88.0, 100.0, p.z));
    if (material < 1.5 && p.y < 22.0) {
        float streak = noise2(vec2(p.x * 15.0, p.y * 2.0 + TIME * 2.5));
        vec3 cascade = mix(vec3(0.17, 0.38, 0.42), vec3(0.68, 0.79, 0.77), streak * 0.8 + 0.2);
        col = mix(col, cascade * (0.65 + 0.35 * sh), stream);
    }
    vec3 halfDir = normalize(sd - rd);
    float spec = pow(max(dot(n, halfDir), 0.0), mix(28.0, 85.0, wet));
    col += vec3(1.1, 0.9, 0.64) * spec * sh * (0.04 + 0.4 * wet + 0.12 * snow);
    return col;
}

float wave(vec2 p) {
    float time = TIME * waterMotion;
    float v = sin(p.x * 1.9 + p.y * 0.7 - time * 1.4) * 0.35;
    v += sin(p.x * -0.8 + p.y * 2.6 + time * 1.7) * 0.20;
    v += sin(p.x * 4.8 + p.y * 3.1 - time * 2.1) * 0.04;
    v += noise2(p * 6.0 + vec2(time * 0.5, 0.0)) * 0.08;
    return v;
}

vec3 waterNormal(vec3 p, float t) {
    float scale = mix(0.025, 0.006, smoothstep(10.0, 110.0, t));
    float w = wave(p.xz);
    return normalize(vec3((w - wave(p.xz + vec2(0.06, 0.0))) * scale / 0.06,
                           1.0, (w - wave(p.xz + vec2(0.0, 0.06))) * scale / 0.06));
}

vec3 water(vec3 p, vec3 ro, vec3 rd, float t, vec3 n, vec3 reflection) {
    float w = wave(p.xz);
    float depth = max(0.0, -terrain(p.xz));
    vec3 submerged = mix(vec3(0.12, 0.23, 0.16), vec3(0.007, 0.085, 0.095), 1.0 - exp(-depth * 0.65));
    float caustic = pow(max(0.0, 0.5 + 0.5 * sin(p.x * 3.5 + w * 4.0) * sin(p.z * 4.1 - w * 5.0)), 5.0);
    submerged += vec3(0.10, 0.18, 0.12) * caustic * exp(-depth * 0.8);
    float fresnel = 0.035 + 0.965 * pow(1.0 - max(dot(-rd, n), 0.0), 5.0);
    vec3 col = mix(submerged, reflection, fresnel);
    vec3 sd = sunDirection();
    float glitter = pow(max(dot(reflect(-sd, n), -rd), 0.0), 350.0);
    col += vec3(5.0, 3.7, 1.9) * glitter;
    float shore = min(depth, max(arch(p) * 2.0, 0.0));
    float foam = (1.0 - smoothstep(0.08, 0.42, shore)) * smoothstep(0.2, 0.68, noise2(p.xz * 9.0 + w));
    col = mix(col, vec3(0.55, 0.68, 0.65), foam * 0.6);
    return haze(col, ro, rd, t);
}

vec3 tonemap(vec3 x) {
    x *= exposure;
    return clamp((x * (2.51 * x + 0.03)) / (x * (2.43 * x + 0.59) + 0.14), 0.0, 1.0);
}

float birds(vec3 ro, vec3 rd, float distanceLimit) {
    float flock = 0.0;
    for(int i=0;i<5;i++) {
        float fi = float(i);
        vec3 center = vec3(8.0 + fi * 1.6 + 3.0 * sin(TIME * 0.12),
                           25.0 + sin(fi * 1.9) * 1.3 + sin(TIME * 0.22) * 0.6,
                           54.0 + fi * 2.0);
        float t = (center.z - ro.z) / max(rd.z,0.01);
        if(t > 0.0 && t < distanceLimit) {
            vec2 q = (ro + rd * t - center).xy;
            float wing = sin(TIME * 3.5 + fi * 1.7) * 0.38;
            float curve = abs(q.y - abs(q.x) * wing - 0.06 * pow(abs(q.x) / 0.38,2.0));
            float pixel = t / RENDERSIZE.y * 0.55;
            float silhouette = (1.0-smoothstep(0.015,0.015+pixel,curve)) * (1.0-smoothstep(0.28,0.4,abs(q.x)));
            flock = max(flock,silhouette);
        }
    }
    return flock;
}

void main() {
    if (PASSINDEX == 0) {
        vec4 prior = IMG_THIS_PIXEL(geologyNoise);
        if (prior.a > 0.5) { gl_FragColor = prior; return; }
        // A padded, 16-cubed noise lattice generated entirely by this shader.
        // Explicit interpolation keeps terrain derivatives smooth across GPUs.
        vec2 pixel = floor(gl_FragCoord.xy);
        vec2 tile = floor(pixel / 18.0);
        vec3 lattice = vec3(mod(mod(pixel,18.0) - 1.0,16.0), mod(tile.x + tile.y * 4.0,16.0));
        float groundNoise = hash12(mod(pixel,64.0) - 32.0);
        gl_FragColor = vec4(hash13(lattice),groundNoise,hash13(mod(lattice+vec3(0,0,1),16.0)),1.0);
        return;
    }
    vec2 uv = (gl_FragCoord.xy - 0.5 * RENDERSIZE) / RENDERSIZE.y;
    float clockTime = TIME * 0.075;
    vec3 ro = vec3(1.2 + sin(clockTime) * 1.8 * cameraDrift,
                   5.0 + sin(clockTime * 0.7) * 0.3 * cameraDrift, -23.0);
    vec3 target = vec3(-1.0, 10.3, 35.0);
    vec3 forward = normalize(target - ro);
    vec3 right = normalize(cross(vec3(0,1,0), forward));
    vec3 up = cross(forward, right);
    vec3 rd = normalize(forward * 1.08 + right * uv.x + up * uv.y);
    float waterT = rd.y < -0.001 ? -ro.y / rd.y : FAR;
    vec3 rayOrigin = ro, rayDir = rd;
    vec3 waterPoint = vec3(0.0), waterN = vec3(0,1,0);
    vec2 hit = vec2(FAR, -1.0);
    bool isWater = false;
    float limit = min(waterT, FAR);
    // One tracing call site and one material call site serve both ray segments.
    for (int bounce = 0; bounce < 2; bounce++) {
        hit = trace(rayOrigin, rayDir, limit, bounce == 1);
        if (bounce == 0 && hit.y < 0.0 && waterT < FAR) {
            isWater = true;
            waterPoint = ro + rd * waterT;
            waterN = waterNormal(waterPoint, waterT);
            rayOrigin = waterPoint + vec3(0.0, 0.10, 0.0);
            rayDir = reflect(rd, waterN);
            rayDir.y = max(rayDir.y, 0.015);
            rayDir = normalize(rayDir);
            limit = 230.0;
        } else break;
    }
    vec3 col = vec3(0.0);
    if (hit.y > 0.0) {
        vec3 p = rayOrigin + rayDir * hit.x;
        col = shadeRock(p, rayDir, hit.x, hit.y, isWater);
        col = haze(col, rayOrigin, rayDir, hit.x);
    } else col = sky(rayDir, true);
    if (isWater) col = water(waterPoint, ro, rd, waterT, waterN, col);
    float occlusionDistance = isWater ? waterT : (hit.y > 0.0 ? hit.x : FAR);
    col = mix(col, vec3(0.055,0.073,0.085), birds(ro,rd,occlusionDistance) * 0.8);
    // Restrained optical bloom around the actual sun direction.
    float glow = pow(max(dot(rd, sunDirection()), 0.0), 24.0);
    col += vec3(0.14, 0.073, 0.025) * glow;
    col = pow(tonemap(col), vec3(1.0 / 2.2));
    vec2 screen = isf_FragNormCoord;
    float vignette = pow(max(16.0 * screen.x * screen.y * (1.0-screen.x) * (1.0-screen.y), 0.0), 0.10);
    col *= 0.82 + 0.18 * vignette;
    col += (hash12(gl_FragCoord.xy) - 0.5) / 255.0;
    gl_FragColor = vec4(col, 1.0);
}

/*{
  "DESCRIPTION": "THE TIDAL CATHEDRAL — an original procedural fjord at first light. A monumental sea-carved arch, glacial peaks, conifer groves, a distant cascade, rippled reflections, wind-driven clouds and circling birds. All geometry, materials and light are synthesized here. The first pass generates a reusable noise lattice; no imported textures or external assets.",
  "CREDIT": "OpenAI / Codex",
  "ISFVSN": "2",
  "CATEGORIES": ["Landscape", "Raymarching"],
  "PASSES": [
    { "TARGET": "geologyNoise", "PERSISTENT": true },
    {}
  ],
  "INPUTS": [
    { "NAME": "cameraDrift", "LABEL": "Camera drift", "TYPE": "float", "DEFAULT": 0.65, "MIN": 0.0, "MAX": 1.0 },
    { "NAME": "sunHeight", "LABEL": "Sun elevation", "TYPE": "float", "DEFAULT": 0.27, "MIN": 0.12, "MAX": 0.85 },
    { "NAME": "atmosphere", "LABEL": "Valley mist", "TYPE": "float", "DEFAULT": 0.5, "MIN": 0.0, "MAX": 1.5 },
    { "NAME": "waterMotion", "LABEL": "Water motion", "TYPE": "float", "DEFAULT": 0.6, "MIN": 0.0, "MAX": 1.5 },
    { "NAME": "exposure", "LABEL": "Exposure", "TYPE": "float", "DEFAULT": 0.95, "MIN": 0.6, "MAX": 1.6 }
  ]
}*/

#define FAR 290.0
const mat2 TURN = mat2(0.80, -0.60, 0.60, 0.80);

float hash12(vec2 p) {
    vec3 q = fract(vec3(p.xyx) * 0.1031);
    q += dot(q, q.yzx + 33.33);
    return fract((q.x + q.y) * q.z);
}

float hash13(vec3 p) {
    p = fract(p * 0.1031);
    p += dot(p, p.zyx + 31.32);
    return fract((p.x + p.y) * p.z);
}

float noise2(vec2 p) {
    vec2 i = floor(p), f = fract(p);
    f = f * f * (3.0 - 2.0 * f);
    vec2 at = mod(i + 32.0, 64.0) + 0.5;
    float a = IMG_PIXEL(geologyNoise, at).g;
    float b = IMG_PIXEL(geologyNoise, at + vec2(1,0)).g;
    float c = IMG_PIXEL(geologyNoise, at + vec2(0,1)).g;
    float d = IMG_PIXEL(geologyNoise, at + vec2(1,1)).g;
    return mix(mix(a,b,f.x),mix(c,d,f.x),f.y);
}

float noise3(vec3 p) {
    vec3 i = floor(p), f = fract(p);
    f = f * f * (3.0 - 2.0 * f);
    i = mod(i, 16.0);
    vec2 tile0 = vec2(mod(i.z, 4.0), floor(i.z / 4.0));
    vec2 at = tile0 * 18.0 + i.xy + 1.5;
    vec2 a = IMG_PIXEL(geologyNoise, at).rb;
    vec2 b = IMG_PIXEL(geologyNoise, at + vec2(1,0)).rb;
    vec2 c = IMG_PIXEL(geologyNoise, at + vec2(0,1)).rb;
    vec2 d = IMG_PIXEL(geologyNoise, at + vec2(1,1)).rb;
    vec2 pair = mix(mix(a,b,f.x),mix(c,d,f.x),f.y);
    return mix(pair.x, pair.y, f.z);
}

float fbm2(vec2 p) {
    float v = 0.0, a = 0.5;
    for (int i = 0; i < 5; i++) {
        v += a * noise2(p);
        p = TURN * p * 2.07 + vec2(17.4, 9.2);
        a *= 0.48;
    }
    return v;
}

float fbm3(vec3 p) {
    float v = 0.0, a = 0.5;
    for (int i = 0; i < 4; i++) {
        v += a * noise3(p);
        p = p.yzx * 2.03 + vec3(11.7, 4.3, 8.1);
        a *= 0.48;
    }
    return v;
}

float ridge(vec2 p) {
    float v = 0.0, a = 0.55, weight = 1.0;
    for (int i = 0; i < 4; i++) {
        float r = 1.0 - abs(2.0 * noise2(p) - 1.0);
        r *= r;
        v += a * r * weight;
        weight = clamp(r * 1.8, 0.15, 1.0);
        p = TURN * p * 2.11 + 3.7;
        a *= 0.49;
    }
    return v;
}

float riverPath(float z) {
    return 4.0 + 5.0 * sin(z * 0.045) - 12.0 * smoothstep(42.0, 80.0, z);
}

float terrain(vec2 p) {
    float channel = riverPath(p.y);
    float bank = smoothstep(9.0, 25.0, abs(p.x - channel));
    float back = smoothstep(42.0, 80.0, p.y);
    float r = ridge(p * 0.035 + vec2(2.8, 7.3));
    float h = -2.7 + bank * (3.8 + 12.0 * fbm2(p * 0.085));
    float peaks = max(0.0, 1.0 - length((p - vec2(-39.0, 105.0)) * vec2(0.020, 0.019))) * 48.0;
    peaks = max(peaks, max(0.0, 1.0 - length((p - vec2(43.0, 123.0)) * vec2(0.021, 0.016))) * 57.0);
    peaks = max(peaks, max(0.0, 1.0 - length((p - vec2(-5.0, 178.0)) * vec2(0.014, 0.015))) * 72.0);
    peaks = max(peaks, max(0.0, 1.0 - length((p - vec2(-89.0, 152.0)) * vec2(0.020, 0.016))) * 61.0);
    h += back * (4.0 + peaks * (0.72 + 0.48 * r) + 5.0 * r);
    h *= 1.0 - 0.55 * exp(-abs(p.x - channel) * 0.3) * back;
    vec2 nearRock = (p - vec2(-11.0, -13.0)) / vec2(9.5, 11.0);
    h += 7.5 * exp(-dot(nearRock, nearRock) * 1.5);
    h += 0.12 * noise2(p * 2.8);
    return h;
}

// Elliptical stone vault, leaned and twisted once in world space.
// The enclosing box avoids evaluating erosion noise outside the arch's region.
float arch(vec3 p) {
    vec3 q = p - vec3(-7.0, 2.0, 27.0);
    vec3 b = abs(q) - vec3(21.0, 24.0, 9.0);
    float bound = length(max(b, 0.0));
    if (bound > 2.0) return bound + 0.2;
    q.x += q.y * 0.15 + sin(q.y * 0.24) * 0.65;
    q.z += q.x * 0.15;
    q.y += sin(q.x * 0.19) * 1.1;
    float thick = 2.15 + 1.1 * (1.0 - smoothstep(-12.0, 0.0, q.x)) + 0.65 * noise3(p * 0.17);
    float d = length(vec2(length(q.xy * vec2(1.0, 0.76)) - 12.0, q.z * 1.3)) - thick;
    d += (noise3(p * 0.46) - 0.5) * 1.65;
    d += (noise3(p * 1.7) - 0.5) * 0.28;
    return d * 0.40;
}

vec2 scene(vec3 p) {
    float ground = terrain(p.xz);
    float land = (p.y - ground) * 0.23;
    float vault = arch(p);
    vec2 res = land < vault ? vec2(land, 1.0) : vec2(vault, 2.0);
    if (p.y - ground < 4.2 && p.y < 21.0 && p.z > -5.0 && p.z < 94.0) {
        vec2 cell = floor(p.xz / 2.2);
        float seed = hash12(cell + 13.5);
        vec2 center = (cell + 0.5) * 2.2;
        center += vec2(seed - 0.5, hash12(cell + 8.1) - 0.5) * 0.6;
        float base = terrain(center);
        if (base > 1.2 && base < 10.5 && seed > 0.32 && noise2(center * 0.15) > 0.37) {
            float ht = 0.85 + seed * 1.4;
            vec3 q = p - vec3(center.x, base - 0.2, center.y);
            q.x += 0.04 * sin(q.y * 3.0 + seed * 8.0);
            float radius = 0.59 * max(1.0 - q.y / ht, 0.0);
            radius *= 0.84 + 0.12 * sin(q.y * 16.0 + seed * 8.0) + 0.12 * noise3(q * 13.0);
            float tree = max(length(q.xz) - radius, max(-q.y, q.y - ht)) * 0.45;
            if (tree < res.x) res = vec2(tree, 3.0);
        }
    }
    return res;
}

vec2 trace(vec3 ro, vec3 rd, float limit, bool reflected) {
    float t = 0.06;
    float mat = -1.0;
    for (int i = 0; i < 220; i++) {
        vec2 h = scene(ro + rd * t);
        float eps = max(0.004, t * (reflected ? 0.0014 : 0.00055));
        if (h.x < eps) { mat = h.y; break; }
        t += max(h.x * 0.91, 0.008);
        if (t > limit || (reflected && i > 145)) break;
    }
    return vec2(min(t, limit), mat);
}

vec3 normalAt(vec3 p, float t) {
    float e = max(0.008, t * 0.00035);
    vec3 n = vec3(0.0);
    for (int i = 0; i < 4; i++) {
        vec3 k = i == 0 ? vec3(1,-1,-1) : (i == 1 ? vec3(-1,-1,1) : (i == 2 ? vec3(-1,1,-1) : vec3(1,1,1)));
        n += k * scene(p + k * e).x;
    }
    return normalize(n);
}

vec3 sunDirection() { return normalize(vec3(-0.65, sunHeight, -0.50)); }

float shadowAt(vec3 p, vec3 lightDir) {
    float sh = 1.0, t = 0.13;
    for (int i = 0; i < 36; i++) {
        float h = scene(p + lightDir * t).x;
        sh = min(sh, 12.0 * max(h, 0.0) / t);
        t += clamp(h, 0.12, 4.0);
        if (sh < 0.015 || t > 65.0) break;
    }
    return clamp(sh, 0.0, 1.0);
}

vec3 sky(vec3 rd, bool clouds) {
    vec3 sd = sunDirection();
    float y = max(rd.y, 0.0);
    float sun = max(dot(rd, sd), 0.0);
    vec3 horizon = mix(vec3(0.48,0.60,0.67), vec3(0.82,0.56,0.34), smoothstep(0.15,-0.8,rd.x) * 0.8);
    vec3 col = mix(horizon, vec3(0.018, 0.085, 0.19), pow(y, 0.42));
    col += vec3(1.0, 0.49, 0.19) * pow(sun, 8.0) * 0.32;
    col += vec3(1.0, 0.65, 0.28) * pow(sun, 70.0) * 0.4;
    col += vec3(9.0, 6.4, 3.6) * smoothstep(0.9995, 0.99985, sun);
    if (clouds && rd.y > 0.015) {
        float trans = 1.0;
        vec3 cloudCol = vec3(0.0);
        float start = 70.0 / rd.y;
        float stride = 22.0 / (rd.y * 9.0);
        for (int i = 0; i < 9; i++) {
            vec3 p = rd * (start + (float(i) + 0.5) * stride);
            p.x += TIME * 0.7;
            vec3 cp = p * vec3(0.010, 0.035, 0.010);
            float shape = fbm3(cp * 1.5 + vec3(1.1, 0, 3.0));
            float edge = smoothstep(70.0, 76.0, p.y) * (1.0 - smoothstep(84.0, 92.0, p.y));
            float den = smoothstep(0.46, 0.66, shape) * edge;
            float a = (1.0 - exp(-den * stride * 0.16)) * smoothstep(0.03, 0.19, rd.y);
            float rim = pow(sun, 12.0);
            vec3 lighting = mix(vec3(0.25, 0.33, 0.42), vec3(0.95, 0.87, 0.76), clamp(0.45 + (0.59 - shape) * 3.0 + rim * 0.5, 0.0, 1.0));
            cloudCol += trans * a * lighting;
            trans *= 1.0 - a;
        }
        col = col * trans + cloudCol;
        // High, stretched cirrus adds a second scale to the sky.
        vec2 cp = rd.xz / max(rd.y, 0.05) * vec2(0.9, 4.5) + vec2(TIME * 0.006, 0);
        float veil = smoothstep(0.55, 0.76, fbm2(cp));
        col = mix(col, vec3(0.91, 0.9, 0.85), veil * 0.22);
    }
    return col;
}

vec3 haze(vec3 col, vec3 ro, vec3 rd, float t) {
    float dy = rd.y * 0.10;
    float integral = abs(dy) < 0.0001 ? t : (1.0 - exp(-dy * t)) / dy;
    float mist = integral * exp(-max(ro.y, 0.0) * 0.10);
    float optical = t * 0.0014 + atmosphere * 0.006 * max(mist, 0.0);
    float lit = pow(max(dot(rd, sunDirection()), 0.0), 6.0);
    vec3 air = mix(vec3(0.32, 0.50, 0.59), vec3(1.1, 0.82, 0.50), lit * 0.72);
    return mix(col, air, 1.0 - exp(-optical));
}

vec3 shadeRock(vec3 p, vec3 rd, float t, float material, bool reflected) {
    vec3 n = normalAt(p, t);
    vec3 sd = sunDirection();
    if (material > 2.5) {
        float sh = shadowAt(p + n * 0.12, sd);
        float needle = noise3(p * 18.0);
        vec3 green = mix(vec3(0.018, 0.038, 0.021), vec3(0.080, 0.115, 0.041), needle);
        vec3 light = vec3(0.32, 0.47, 0.58) + vec3(1.5, 1.05, 0.54) * max(dot(n, sd), 0.0) * sh;
        light += vec3(0.28, 0.36, 0.12) * pow(max(dot(rd, sd), 0.0), 3.0);
        return green * light;
    }
    // Microrelief is tangential, preserving the vault's geometric silhouette.
    float be = 0.035;
    vec3 bump = vec3(noise3((p + vec3(be,0,0)) * 7.0) - noise3((p - vec3(be,0,0)) * 7.0),
                     noise3((p + vec3(0,be,0)) * 7.0) - noise3((p - vec3(0,be,0)) * 7.0),
                     noise3((p + vec3(0,0,be)) * 7.0) - noise3((p - vec3(0,0,be)) * 7.0));
    n = normalize(n - (bump - n * dot(bump, n)) * 0.65 / (1.0 + t * 0.009));
    float grain = fbm3(p * vec3(1.3, 1.8, 1.3));
    float layer = sin(p.y * 5.2 + noise3(p * 0.42) * 8.0 + p.x * 0.3);
    float fine = noise3(p * 13.0);
    vec3 stone = mix(vec3(0.10, 0.095, 0.08), vec3(0.46, 0.33, 0.21), grain);
    stone *= 0.83 + 0.26 * smoothstep(-0.85, 0.15, layer) + 0.15 * fine;
    float cracks = smoothstep(0.025, 0.12, abs(sin(p.y * 2.9 + noise3(p * 0.58) * 5.0)));
    stone *= 0.72 + 0.28 * cracks;
    float moss = smoothstep(0.38, 0.82, n.y + (grain - 0.5) * 0.65);
    moss *= 1.0 - smoothstep(19.0, 29.0, p.y);
    vec3 vegetation = mix(vec3(0.035, 0.07, 0.014), vec3(0.18, 0.24, 0.045), grain);
    stone = mix(stone, vegetation, moss * 0.95);
    float snowLine = p.y - 25.0 + 5.0 * fbm2(p.xz * 0.16);
    float snow = smoothstep(0.0, 4.0, snowLine) * smoothstep(0.38, 0.83, n.y + (grain - 0.5) * 0.35);
    if (material > 1.5) snow = 0.0;
    stone = mix(stone, vec3(0.62, 0.72, 0.79), snow);
    float wet = 1.0 - smoothstep(0.15, 1.7, p.y);
    stone *= 1.0 - wet * 0.5;
    float ao = 1.0;
    if (!reflected) {
        float occ = 0.0;
        for (int i = 1; i <= 3; i++) {
            float s = float(i) * 0.65;
            occ += max(0.0, s - scene(p + n * s).x / 0.4) / exp2(float(i));
        }
        ao = clamp(1.0 - occ * 0.45, 0.3, 1.0);
    }
    float sh = shadowAt(p + n * 0.09, sd);
    float diffuse = max(dot(n, sd), 0.0) * sh;
    vec3 ambient = vec3(0.25, 0.38, 0.53) * (0.38 + 0.62 * max(n.y, 0.0)) * ao;
    ambient += vec3(0.13, 0.17, 0.12) * max(0.0, -n.y + 0.25);
    vec3 col = stone * (ambient + vec3(2.2, 1.30, 0.65) * diffuse);
    float stream = (1.0 - smoothstep(0.28, 0.72, abs(p.x - riverPath(p.z)))) * smoothstep(52.0, 58.0, p.z) * (1.0 - smoothstep(88.0, 100.0, p.z));
    if (material < 1.5 && p.y < 22.0) {
        float streak = noise2(vec2(p.x * 15.0, p.y * 2.0 + TIME * 2.5));
        vec3 cascade = mix(vec3(0.17, 0.38, 0.42), vec3(0.68, 0.79, 0.77), streak * 0.8 + 0.2);
        col = mix(col, cascade * (0.65 + 0.35 * sh), stream);
    }
    vec3 halfDir = normalize(sd - rd);
    float spec = pow(max(dot(n, halfDir), 0.0), mix(28.0, 85.0, wet));
    col += vec3(1.1, 0.9, 0.64) * spec * sh * (0.04 + 0.4 * wet + 0.12 * snow);
    return col;
}

float wave(vec2 p) {
    float time = TIME * waterMotion;
    float v = sin(p.x * 1.9 + p.y * 0.7 - time * 1.4) * 0.35;
    v += sin(p.x * -0.8 + p.y * 2.6 + time * 1.7) * 0.20;
    v += sin(p.x * 4.8 + p.y * 3.1 - time * 2.1) * 0.04;
    v += noise2(p * 6.0 + vec2(time * 0.5, 0.0)) * 0.08;
    return v;
}

vec3 waterNormal(vec3 p, float t) {
    float scale = mix(0.025, 0.006, smoothstep(10.0, 110.0, t));
    float w = wave(p.xz);
    return normalize(vec3((w - wave(p.xz + vec2(0.06, 0.0))) * scale / 0.06,
                           1.0, (w - wave(p.xz + vec2(0.0, 0.06))) * scale / 0.06));
}

vec3 water(vec3 p, vec3 ro, vec3 rd, float t, vec3 n, vec3 reflection) {
    float w = wave(p.xz);
    float depth = max(0.0, -terrain(p.xz));
    vec3 submerged = mix(vec3(0.12, 0.23, 0.16), vec3(0.007, 0.085, 0.095), 1.0 - exp(-depth * 0.65));
    float caustic = pow(max(0.0, 0.5 + 0.5 * sin(p.x * 3.5 + w * 4.0) * sin(p.z * 4.1 - w * 5.0)), 5.0);
    submerged += vec3(0.10, 0.18, 0.12) * caustic * exp(-depth * 0.8);
    float fresnel = 0.035 + 0.965 * pow(1.0 - max(dot(-rd, n), 0.0), 5.0);
    vec3 col = mix(submerged, reflection, fresnel);
    vec3 sd = sunDirection();
    float glitter = pow(max(dot(reflect(-sd, n), -rd), 0.0), 350.0);
    col += vec3(5.0, 3.7, 1.9) * glitter;
    float shore = min(depth, max(arch(p) * 2.0, 0.0));
    float foam = (1.0 - smoothstep(0.08, 0.42, shore)) * smoothstep(0.2, 0.68, noise2(p.xz * 9.0 + w));
    col = mix(col, vec3(0.55, 0.68, 0.65), foam * 0.6);
    return haze(col, ro, rd, t);
}

vec3 tonemap(vec3 x) {
    x *= exposure;
    return clamp((x * (2.51 * x + 0.03)) / (x * (2.43 * x + 0.59) + 0.14), 0.0, 1.0);
}

float birds(vec3 ro, vec3 rd, float distanceLimit) {
    float flock = 0.0;
    for(int i=0;i<5;i++) {
        float fi = float(i);
        vec3 center = vec3(8.0 + fi * 1.6 + 3.0 * sin(TIME * 0.12),
                           25.0 + sin(fi * 1.9) * 1.3 + sin(TIME * 0.22) * 0.6,
                           54.0 + fi * 2.0);
        float t = (center.z - ro.z) / max(rd.z,0.01);
        if(t > 0.0 && t < distanceLimit) {
            vec2 q = (ro + rd * t - center).xy;
            float wing = sin(TIME * 3.5 + fi * 1.7) * 0.38;
            float curve = abs(q.y - abs(q.x) * wing - 0.06 * pow(abs(q.x) / 0.38,2.0));
            float pixel = t / RENDERSIZE.y * 0.55;
            float silhouette = (1.0-smoothstep(0.015,0.015+pixel,curve)) * (1.0-smoothstep(0.28,0.4,abs(q.x)));
            flock = max(flock,silhouette);
        }
    }
    return flock;
}

void main() {
    if (PASSINDEX == 0) {
        vec4 prior = IMG_THIS_PIXEL(geologyNoise);
        if (prior.a > 0.5) { gl_FragColor = prior; return; }
        // A padded, 16-cubed noise lattice generated entirely by this shader.
        // Explicit interpolation keeps terrain derivatives smooth across GPUs.
        vec2 pixel = floor(gl_FragCoord.xy);
        vec2 tile = floor(pixel / 18.0);
        vec3 lattice = vec3(mod(mod(pixel,18.0) - 1.0,16.0), mod(tile.x + tile.y * 4.0,16.0));
        float groundNoise = hash12(mod(pixel,64.0) - 32.0);
        gl_FragColor = vec4(hash13(lattice),groundNoise,hash13(mod(lattice+vec3(0,0,1),16.0)),1.0);
        return;
    }
    vec2 uv = (gl_FragCoord.xy - 0.5 * RENDERSIZE) / RENDERSIZE.y;
    float clockTime = TIME * 0.075;
    vec3 ro = vec3(1.2 + sin(clockTime) * 1.8 * cameraDrift,
                   5.0 + sin(clockTime * 0.7) * 0.3 * cameraDrift, -23.0);
    vec3 target = vec3(-1.0, 10.3, 35.0);
    vec3 forward = normalize(target - ro);
    vec3 right = normalize(cross(vec3(0,1,0), forward));
    vec3 up = cross(forward, right);
    vec3 rd = normalize(forward * 1.08 + right * uv.x + up * uv.y);
    float waterT = rd.y < -0.001 ? -ro.y / rd.y : FAR;
    vec3 rayOrigin = ro, rayDir = rd;
    vec3 waterPoint = vec3(0.0), waterN = vec3(0,1,0);
    vec2 hit = vec2(FAR, -1.0);
    bool isWater = false;
    float limit = min(waterT, FAR);
    // One tracing call site and one material call site serve both ray segments.
    for (int bounce = 0; bounce < 2; bounce++) {
        hit = trace(rayOrigin, rayDir, limit, bounce == 1);
        if (bounce == 0 && hit.y < 0.0 && waterT < FAR) {
            isWater = true;
            waterPoint = ro + rd * waterT;
            waterN = waterNormal(waterPoint, waterT);
            rayOrigin = waterPoint + vec3(0.0, 0.10, 0.0);
            rayDir = reflect(rd, waterN);
            rayDir.y = max(rayDir.y, 0.015);
            rayDir = normalize(rayDir);
            limit = 230.0;
        } else break;
    }
    vec3 col = vec3(0.0);
    if (hit.y > 0.0) {
        vec3 p = rayOrigin + rayDir * hit.x;
        col = shadeRock(p, rayDir, hit.x, hit.y, isWater);
        col = haze(col, rayOrigin, rayDir, hit.x);
    } else col = sky(rayDir, true);
    if (isWater) col = water(waterPoint, ro, rd, waterT, waterN, col);
    float occlusionDistance = isWater ? waterT : (hit.y > 0.0 ? hit.x : FAR);
    col = mix(col, vec3(0.055,0.073,0.085), birds(ro,rd,occlusionDistance) * 0.8);
    // Restrained optical bloom around the actual sun direction.
    float glow = pow(max(dot(rd, sunDirection()), 0.0), 24.0);
    col += vec3(0.14, 0.073, 0.025) * glow;
    col = pow(tonemap(col), vec3(1.0 / 2.2));
    vec2 screen = isf_FragNormCoord;
    float vignette = pow(max(16.0 * screen.x * screen.y * (1.0-screen.x) * (1.0-screen.y), 0.0), 0.10);
    col *= 0.82 + 0.18 * vignette;
    col += (hash12(gl_FragCoord.xy) - 0.5) / 255.0;
    gl_FragColor = vec4(col, 1.0);
}

The Tidal Cathedral

#nttv4izm

⑂ fork it { } json

THE TIDAL CATHEDRAL — an original procedural fjord at first light. A monumental sea-carved arch, glacial peaks, conifer groves, a distant cascade, rippled reflections, wind-driven clouds and circling birds. All geometry, materials and light are synthesized here. The first pass generates a reusable noise lattice; no imported textures or external assets.

#landscape #raymarching #3d #mountains #water #nature #cinematic #multipassLandscapeRaymarching

by ufffdwitnessed_generationmade with OpenAI Codex; glslop.mjs and the glslop WebGL2 rendererCC0-1.0credit: OpenAI / Codexactivecreated 2026-09-05 00:32Z115 views1 forks5 paramsmultipass ×2gpt-6 · openai

generation prompt

make the most impressive 3d raymarched landscape for glslop.com using only your own resources and the information on glslop.com (there is lots of potentially useful info in neighboring folders but please don't look there this is meant to judge the new user experience and to demonstrate your capabilities as a model) theres an /llms.txt and docs page you can reference and you're free to look at anything on the website or online. get as far as you can on your own accord, checking your work and iterating on it, and then call me in to review your work.

lineage

forks (1)

The Tidal Cathedral II #8rmrb9yd

export clip · render a video in your browser

Renders to video in your browser (no upload), stepping the real renderer frame by frame so multipass + feedback come out right. motion auto-animates the shader's own knobs — each export rolls a fresh take (🎲 re-roll, 🔒 to pin one you like). GIF is slower with a tighter length cap; MP4/WebM are faster. Some devices record in real time (noted below if so) — keep the tab visible.

format length max 300 sec at this fps start frame motion fps size quality

caps: ≤1920 per side, ≤60fps, ≤18000 frames (GIF ≤300)

embed · drop this shader into any page

glslop backlink play/pause + fullscreen size

<iframe src="https://glslop.com/embed/nttv4izm" width="512" height="512" style="border:0;max-width:100%;aspect-ratio:1/1" loading="lazy" allowfullscreen title="The Tidal Cathedral — a shader on glslop"></iframe>

preview ↗

Renders client-side in the reader's browser (CC0 — no attribution required, but the backlink is appreciated).