regl-irradiance-envmap

Easily generate an irradiance environment map from an existing environment map.

Demo

Install

npm install regl-irradiance-envmap

Usage

const createIrradianceRenderer = require("regl-irradiance-envmap");

const renderIrradiance = createIrradianceRenderer(regl);

const irradianceMap = renderIrradiance(envMap, opts);

createIrradianceRenderer takes a regl context as a parameter, and returns the function renderIrradiance.

renderIrradiance takes an envMap and opts parameter and returns a regl framebufferCube object that can be immediately used as a samplerCube in your shaders, or passed back into the renderIrradiance function to update it.

The envMap parameter is a regl framebufferCube or cube (cubemap) object that you provide.

The opts parameter is an object with the following (optional) members:

• samples: The number of random samples to take for each pixel in the environment map, int, 128
• diffusivity: How diffuse the sample rays are. 0.0 is perfectly reflective, 1.0 is perfectly diffusive, float, default 0.5
• resolution: The resolution of each square face of the environment cubemap if cubeFBO is not provided, int, default 128
• cubeFBO: The regl framebufferCube object that will be returned, default regl.framebufferCube(opts.resolution)