About

This project is heavily based on the original publication "Parsing The IESNA LM-63 Photometric Data File" and its accompanying source code that is available at http://lumen.iee.put.poznan.pl/kw/iesna.txt. For reference purposes, a copy of the original publication is included in this repository under /vendor/iesna-c/.

Usage

To render an IES document to an HTML canvas using this library:

import * as IESNA from "iesna";

IESNA.renderToCanvas({
  iesData: IESNA.parse("IES document goes here"),
  canvas: document.getElementsByTagName("canvas")[0],
});

In addition to the IESNA.renderToCanvas() method, light sampling can be done using the IESNA.sample() function. This function takes an IES data object and an x,y,z coordinate in light space and returns the light intensity at that position.

const iesData = IESNA.parse("IES document goes here");
const intensity = IESNA.sample({ iesData, x, y, z });

Demo

There is a demo of rendering IES documents in the browser available here.

To run it locally: npm install && npm run dev.