Create singleton Configs class for managing global configurations

[xeolabs]

Add a new Configs class to manage global configurations for all Viewers.

• See API docs for Configs
• Published in npm xeokit-sdk 2.0.12

Usage

In the example below, we'll disable xeokit's double-precision support, which gives a performance and memory boost
on low-power devices, but means that we can no longer render double-precision models without jittering. This is OK if we know that we're not going to view models that are geographically vast, or offset far from the World coordinate origin.

We'll also switch from window.requestAnimationFrame to window.setInterval for xeokit's animations, which can also give a
performance boost in some cases.

• [Run this example]

import {Configs, Viewer, XKTLoaderPlugin} from "../dist/xeokit-sdk.min.es.js";

// Access xeoit-sdk global configs.
// We typically set configs only before we create any Viewers.
const configs = new Configs();

// Disable 64-bit precision for extra speed.
// Only set this config once, before you create any Viewers.
configs.doublePrecisionEnabled = false;

// Disable window.requestAnimationFrame (RAF) and use
// window.setInterval for Viewer render loops.
// This config can be switched dynamically, if needed.
configs.rafEnabled = false;

// This Viewer will now have 64-precision disabled and 
// will use window.setInterval for its render loop.
const viewer = new Viewer({
     canvasId: "myCanvas"
});

viewer.camera.eye = [-3.933, 2.855, 27.018];
viewer.camera.look = [4.400, 3.724, 8.899];
viewer.camera.up = [-0.018, 0.999, 0.039];

const xktLoader = new XKTLoaderPlugin(viewer);

const model = xktLoader.load({
    src: "../assets/models/xkt/v8/ifc/Duplex.ifc.xkt"
});

[Amoki]

So we never use configs as a param of new Viewer ?
This would make it impossible to have 2 xeokit instances with different configs on the same page

[xeolabs]

Configs are for intentionally for handling global configs that would always apply to all Viewers.