fn_registry/cpp/functions/viz/scatter_3d.md

name, kind, lang, domain, version, purity, signature, description, tags, uses_functions, uses_types, returns, returns_optional, error_type, imports, tested, tests, test_file_path, file_path, framework, params, output, notes

name	kind	lang	domain	version	purity	signature	description	tags	uses_functions	uses_types	returns	returns_optional	error_type	imports	tested	tests	test_file_path	file_path	framework	params	output	notes
scatter_3d	component	cpp	viz	1.0.0	pure	void scatter_3d(const char* title, const fn::Scatter3DConfig& cfg)	Scatter 3D ImPlot3D con tamano y color opcional por punto, orbit/zoom/pan nativos	implot3d chart visualization gpu scatter 3d points pendiente-usar				false		imgui implot3d	false			cpp/functions/viz/scatter_3d.cpp	imgui	name desc title Titulo / id interno del plot name desc cfg fn::Scatter3DConfig — xs, ys, zs (length n), sizes opcional, colors opcional (ImU32 RGBA), size del plot	Renderiza una nube de puntos 3D dentro del frame ImGui actual; soporta orbit (drag), zoom (wheel) y pan	scaffolding/demo en primitives_gallery

scatter_3d

Scatter 3D usando ImPlot3D::PlotScatter. Soporta tamano y color opcional por punto via ImPlot3DSpec::MarkerSizes / MarkerFillColors.

Util para visualizaciones de PCA / clustering / nubes de puntos sinteticas. Llamar dentro de un frame ImGui activo.

Caracteristicas

• Per-point size: pasar cfg.sizes (length = n, en pixeles) o dejar nullptr para usar el tamano del estilo activo.
• Per-point color: pasar cfg.colors (length = n, ImU32 RGBA) o dejar nullptr para que ImPlot3D use el color del colormap activo.
• Orbit / zoom / pan: nativos de ImPlot3D.

Ejemplo

#include "viz/scatter_3d.h"
#include "imgui.h"
#include <vector>
#include <random>

const int N = 500;
std::vector<float> xs(N), ys(N), zs(N);
std::vector<ImU32> colors(N);

std::mt19937 rng(42);
std::normal_distribution<float> g(0.f, 0.4f);
const ImU32 palette[3] = {
    IM_COL32(255, 99,  71, 255),  // tomate
    IM_COL32( 65,170,255, 255),   // azul
    IM_COL32(120,220,120, 255),   // verde
};
const float cx[3] = {-1.5f, 1.5f, 0.f};
const float cy[3] = { 0.f,   0.f, 2.0f};
const float cz[3] = { 0.f,   1.0f,-1.0f};
for (int i = 0; i < N; ++i) {
    int c = i % 3;
    xs[i] = cx[c] + g(rng);
    ys[i] = cy[c] + g(rng);
    zs[i] = cz[c] + g(rng);
    colors[i] = palette[c];
}

fn::Scatter3DConfig cfg{};
cfg.xs = xs.data(); cfg.ys = ys.data(); cfg.zs = zs.data();
cfg.colors = colors.data();
cfg.n = N;
fn::scatter_3d("##clusters", cfg);