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Copy pathgen-grid.mjs
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61 lines (49 loc) · 1.93 KB
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class Generator {
constructor(width, height, spacing, s, r, g, b, a) {
this.count = width * height;
this.columnNames = [
'x', 'y', 'z',
'scale_0', 'scale_1', 'scale_2',
'f_dc_0', 'f_dc_1', 'f_dc_2', 'opacity',
'rot_0', 'rot_1', 'rot_2', 'rot_3'
];
const SH_C0 = 0.28209479177387814;
const packClr = (c) => (c - 0.5) / SH_C0;
const packOpacity = (opacity) => (opacity <= 0) ? -20 : (opacity >= 1) ? 20 : -Math.log(1 / opacity - 1);
const gs = Math.log(s); // e^x
const gr = packClr(r);
const gg = packClr(g);
const gb = packClr(b);
const ga = packOpacity(a);
this.getRow = (index, row) =>{
row.x = ((index % width) - width * 0.5) * spacing;
row.y = 0;
row.z = (Math.floor(index / width) - height * 0.5) * spacing;
row.scale_0 = gs;
row.scale_1 = gs;
row.scale_2 = gs;
row.f_dc_0 = gr;
row.f_dc_1 = gg;
row.f_dc_2 = gb;
row.opacity = ga;
row.rot_0 = 0;
row.rot_1 = 0;
row.rot_2 = 0;
row.rot_3 = 1;
};
}
static create(params) {
const floatParam = (name, defaultValue) => parseFloat(params.find(p => p.name === name)?.value ?? defaultValue);
const w = Math.floor(floatParam('width', 1000));
const h = Math.floor(floatParam('height', 1000));
const spacing = floatParam('spacing', 1.0);
const s = floatParam('scale', 0.1);
const r = floatParam('r', 1);
const g = floatParam('g', 1);
const b = floatParam('b', 1);
const a = floatParam('a', 1.0);
console.log(`Generating grid width=${w} height=${h} spacing=${spacing} scale=${s} r=${r}, g=${g}, b=${b} alpha=${a}`);
return new Generator(w, h, spacing, s, r, g, b, a);
}
};
export { Generator };