This adds a Occlusion SOP node to the Polygonjs webgl engine.

This wraps the work done in https://github.com/wwwtyro/geo-ambient-occlusion into a node that can be used with all the other nodes available on Polygonjs.

See example scene:

Import the plugin:

yarn add @polygonjs/plugin-occlusion

And register the plugin in the function configurePolygonjs in the file PolyConfig.js so that the occlusion node can be accessible in both the editor and your exported scene:

import {polyPluginOcclusion} from '@polygonjs/plugin-occlusion';
export function configurePolygonjs(poly) {
	poly.registerPlugin(polyPluginOcclusion);
}