Generative artist, sharing my journey in visual experiments.
p = getRandomPalette()
palette = shuffle(p)
sh = () => raymarch({
antiAliasing: 6,
eye: `vec3(1.3)*2.`,
background: `vec3(${hexToRgb(palette[0]).join(',')})/255.`,
sceneSDF: `
#define PI ${Math.PI}
#define TAU ${Math.PI * 2}
#define NUM_COLORS ${palette.length}.
uniform sampler2D u_texture;
${iqSDF.sdBox()}
${iqSDF.sdSphere()}
${iqSDF.opIntersection()}
${glslSnippets.rotate3D()}
float glow = 0.;
// from https://www.youtube.com/watch?v=-adHIyjIYgk&list=WL&index=44
float sdGyroid(vec3 p, float scale, float thickness, float bias) {
p *= scale;
float d = abs(dot(sin(p*.5), cos((p.zxy + sin(u_time * TAU) * 3.) * 1.23)) - bias) / scale - thickness;
return d * .5; // to prevent overstepping artefacts from the uneven (non lipschitz) continuous distance function, dividing it gives smaller steps that are less likely to jump through the geometry
}
vec2 sceneSDF(vec3 p) {
p *= rotate3D(u_time * TAU, vec3(0, 1, 0));
float box = sdBox(p + vec3(0., 0., sin(u_time * TAU) * 1.2), vec3(1.5, 1.5, .01));
float gyroid = sdGyroid(p, 10., .01, 0.);
float d = opIntersection(sdSphere(p, 1.5), gyroid);
// d = opIntersection(d, box);
//glow += 0.006 / (0.01 + d * d * 5.) / (float(AA * AA) * 10.);
return vec2(d, 4.);
}`,
computeColor: `
vec3 computeColor(vec3 ro, vec3 rd, vec3 pos, float d, float m) {
vec3 nor = calcNormal(pos);
return nor;
vec3 ref = reflect(rd, nor); // reflected ray
// material
vec3 col = texture2D(u_texture, vec2(m / NUM_COLORS, .5)).rgb;
// lighting
float occ = calcAO(pos, nor); // ambient occlusion
vec3 lig = normalize(vec3(-0.4, 0.7, -0.6)); // sunlight
float amb = clamp(0.5 + 0.5 * nor.y, 0.0, 1.0); // ambient light
float dif = clamp(dot(nor, lig), 0.0, 1.0); // diffuse reflection from sunlight
// backlight
float bac = clamp(dot(nor, normalize(vec3(-lig.x, 0.0, -lig.z))), 0.0, 1.0) * clamp(1.0 - pos.y, 0.0, 1.0);
float dom = smoothstep(-0.1, 0.1, ref.y); // dome light
float fre = pow(clamp(1.0 + dot(nor, rd), 0.0, 1.0), 2.0); // fresnel
float spe = pow(clamp(dot(ref, lig), 0.0, 1.0), 16.0); // specular reflection
dif *= softshadow(pos, lig, 0.02, 2.5);
dom *= softshadow(pos, ref, 0.02, 2.5);
vec3 lin = vec3(0.0);
lin += 1.30 * dif * vec3(1.00, 0.80, 0.55);
lin += 2.00 * spe * vec3(1.00, 0.90, 0.70) * dif;
lin += 0.40 * amb * vec3(0.40, 0.60, 1.00) * occ;
lin += 0.50 * dom * vec3(0.40, 0.60, 1.00) * occ;
lin += 0.50 * bac * vec3(0.25, 0.25, 0.25) * occ;
lin += 0.25 * fre * vec3(1.00, 1.00, 1.00) * occ;
col = col * lin;
// mix in fog?
// col = mix(col, vec3(0.8, 0.9, 1.0), 1.0 - exp(-0.0002 * d * d * d));
col = mix(col, vec3(0.), 1.0 - exp(-0.003 * d * d * d));
// gamma
col = pow(col, vec3(0.4545));
return col;
}`,
effect: `
vec3 effect(vec3 c) {
c += glow * texture2D(u_texture, vec2(1.5 / NUM_COLORS, .5)).rgb;
return c;
}
`,
logShader: true
})
calcNormal = () => `
// Compute normal vector to surface at pos, using central differences method?
vec3 calcNormal(in vec3 pos) {
// epsilon = a small number
vec2 e = vec2(1.0, -1.0) * 0.5773 * 0.0005;
return normalize(
e.xyy * sceneSDF(pos + e.xyy).x +
e.yyx * sceneSDF(pos + e.yyx).x +
e.yxy * sceneSDF(pos + e.yxy).x +
e.xxx * sceneSDF(pos + e.xxx).x
);
}`
iqSDF
motionToolkit
glslSnippets
import {shuffle} from '@makio135/utilities'
import {getRandomPalette, displayPalettes, hexToRgb} from '@makio135/give-me-colors'
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