add render chain

src/d3/RenderChain.js

@@ -0,0 +1,19 @@
+export default class RenderChain {
+  constructor(renderer, scene, camera) {
+    this._renderer = renderer;
+    this._scene = scene;
+    this._camera = camera;
+  }
+
+  setSize(width, height) {
+    this._renderer.setSize(width, height);
+
+    // adjust aspect ratio of camera
+    this._camera.aspect = width / height;
+    this._camera.updateProjectionMatrix();
+  }
+
+  render() {
+    this._renderer.render(this._scene, this._camera);
+  }
+}

src/d3/index.js

@@ -1,7 +1,8 @@
 import createSceneData from './createSceneData.js';
 import createScene from './createScene.js';
+import RenderChain from './RenderChain.js';
 import ToonShaderRenderChain from './ToonShaderRenderChain.js';
 import ShapeMesh from './ShapeMesh.js';
 import ShapesManager from './ShapesManager.js';
 
-export { createSceneData, createScene, ToonShaderRenderChain, ShapeMesh, ShapesManager };
+export { createSceneData, createScene, RenderChain, ToonShaderRenderChain, ShapeMesh, ShapesManager };