Generative artist, sharing my journey in visual experiments.
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Edited
Nov 30, 2020
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Raymarch Helper
raymarch = (opts = {}) => {
const {
sceneSDF = `vec2 sceneSDF(vec3 p) { return vec2(length(p) - 1., 2.); }`,
computeColor = computeColorIQ(),
eye = `vec3(0.0, 0.0, 4.0)`,
target = `vec3(0.0)`,
background = `vec3(0.6 - length((gl_FragCoord.xy - u_resolution / 2.) / u_resolution.x))`,
distMin = 0.001,
distMax = 20,
raymarchingSteps = 100,
antiAliasing = 1,
gamma = `vec3(1.)`,
init = `void init() {}`,
effect = `vec3 effect(vec3 col) { return col; }`,
...options
} = opts
return fragment(`
precision mediump float;
uniform vec2 u_resolution;
uniform vec2 u_mouse;
uniform float u_time;
// Antialiasing: number of samples in x and y dimensions
#define AA ${antiAliasing | 0}
#define MIN_DIST float(${distMin})
#define MAX_DIST float(${distMax})
${sceneSDF}
${setCamera()}
${castRay(raymarchingSteps)}
${softShadow()}
${calcNormal()}
${calcAO()}
${computeColor}
${render(background)}
${init}
${effect}
void main() {
// Ray Origin)
vec3 ro = ${eye};
vec3 ta = ${target};
// camera-to-world transformation
mat3 ca = setCamera(ro, ta, 0.0);
vec3 color = vec3(0.0);
#if AA>1
for(int m = 0; m < AA; m++)
for(int n = 0; n < AA; n++) {
// pixel coordinates
vec2 o = vec2(float(m), float(n)) / float(AA) - 0.5;
vec2 p = (-u_resolution.xy + 2.0 * (gl_FragCoord.xy + o)) / u_resolution.y;
#else
vec2 p = (-u_resolution.xy + 2.0 * gl_FragCoord.xy) / u_resolution.y;
#endif
// ray direction
vec3 rd = ca * normalize(vec3(p.xy, 2.0));
// render
vec3 col = render(ro, rd);
color += col;
#if AA>1
}
color /= float(AA*AA);
#endif
color = effect(color);
gl_FragColor = vec4(color, 1.0);
}`, options)
}
One platform to build and deploy the best data apps
Experiment and prototype by building visualizations in live JavaScript notebooks. Collaborate with your team and decide which concepts to build out.
Use Observable Framework to build data apps locally. Use data loaders to build in any language or library, including Python, SQL, and R.
Seamlessly deploy to Observable. Test before you ship, use automatic deploy-on-commit, and ensure your projects are always up-to-date.