light-render

$3

Nice 2D light rendering with pretty good ray tracing effect. Providing both CPU & GPU ways.

Features included in this package:

- Monte Carlo integral
- Ray Tracing
- Jittered sampling

Thanks for Miloyip's sharing. Also he's the author of RapidJson which is a really effecient json parsing library.

$3

``bash
npm i -S light-render
`

![](https://user-images.githubusercontent.com/6587734/52172954-41527e80-27b5-11e9-95d3-b3d1756743cc.png)

A quick glance at Light with a short demo:

`javascript
import { Light } from 'light-render';

// Whether to render in CPU.
const useCPU = false;
const Kit = useCPU ? Light.cpu : Light.gpu;

const {
SDF: {
Circle,
Plane,
Rect,
},
render
} = Kit;

const c = new Circle({
emissive: 20,
reflectivity: 0,
eta: 0,
}, { x: 0.5, y: -0.5 }, .05)
const i = new Circle({
emissive: 0,
reflectivity: .2,
eta: 1.5,
}, { x: 0.5, y: 0.87 }, 0.2);
const j = new Plane({
emissive: 0,
reflectivity: .2,
eta: 1.45,
}, { x: 0.5, y: .5 }, { x: .0, y: -1.0 });

// Rendering method.
render(document.getElementById('cv'), c.union(i.intersect(j)));
`

#### render arguments

Declaration:

`javascript
function render(cv, objs, opts)
`

##### cv: HTMLCanvasElement

Canvas DOM

##### objs

objects that being described in sdf.

> What's SDF? It's a kind of model that can build a scene in this senario called Signed Distance Field.

SDF constructors:

- Circle(props, center, radius)
- Rect(props, center, theta, s)
- Plane(props, pxy, normal)

SDF methods:

- union(o)
- intersect(o)
- subtract(o)

##### opts: options for rendering

- N Times to sample. 64.0 by default
- MAX_STEP Maximum steps for ray tracing. 10 by default.
- MAX_DISTANCE Maximum distance for ray tracing. 10.0` by default.