From 19d9630aedf9a1817d2d20fc337111a757e830ac Mon Sep 17 00:00:00 2001
From: Bert Peters <bert@bertptrs.nl>
Date: Tue, 12 Mar 2019 16:59:19 +0100
Subject: [PATCH] Implement basic lighting.

---
 src/open.js | 36 ++++++++++++++++++++++++++++++++----
 1 file changed, 32 insertions(+), 4 deletions(-)

diff --git a/src/open.js b/src/open.js
index ea1c606..3de49db 100644
--- a/src/open.js
+++ b/src/open.js
@@ -4,15 +4,21 @@ const STAR_POINTS = 5;
 
 let scene, camera, renderer;
 let group;
+let lights = {};
 
 function addStar() {
     let geometry = new THREE.BufferGeometry();
     let vertices = starCoordinates(2, 3, 0);
+
     geometry.addAttribute('position', new THREE.BufferAttribute(vertices, 3));
     geometry.setIndex(filledStarIndices());
-    let material = new THREE.MeshBasicMaterial({color: 0x00ff00});
-    material.side = THREE.DoubleSide;
+    geometry.computeVertexNormals();
+    let material = new THREE.MeshStandardMaterial({
+        side: THREE.DoubleSide,
+        color: 0x00ff00,
+    });
     let star = new THREE.Mesh(geometry, material);
+    star.receiveShadow = true;
     group.add(star);
 }
 
@@ -23,16 +29,35 @@ function startOpenAnimation() {
 
     renderer = new THREE.WebGLRenderer();
     renderer.setSize(window.innerWidth, window.innerHeight);
+    renderer.shadowMap.enabled = true;
+    renderer.shadowMap.autoUpdate = true;
     document.body.appendChild(renderer.domElement);
 
     group = new THREE.Group();
     scene.add(group);
+
+    initLighting();
     addStar();
     loadFont();
 
     requestAnimationFrame(animate)
 }
 
+function initLighting() {
+    let spotLight = new THREE.PointLight(0xffffff);
+    spotLight.position.set(10, 10, 10);
+    spotLight.castShadow = true;
+    spotLight.shadow.mapSize.width = 1024;  // default
+    spotLight.shadow.mapSize.height = 1024; // default
+    scene.add(spotLight);
+
+    let ambient = new THREE.AmbientLight(0x404040);
+    scene.add(ambient);
+
+    lights.spotLight = spotLight;
+    lights.ambient = ambient;
+}
+
 function loadFont() {
     import('three/examples/fonts/helvetiker_bold.typeface').then(function (data) {
         let font = new THREE.Font(data);
@@ -42,12 +67,15 @@ function loadFont() {
             height: 0.3,
             curveSegments: 12
         }).center();
+        geometry.computeFaceNormals();
 
-        let textMaterial = new THREE.MeshBasicMaterial({
+        let textMaterial = new THREE.MeshStandardMaterial({
             color: 0xff00ff
         });
 
         let mesh = new THREE.Mesh(geometry, textMaterial);
+        mesh.castShadow = true;
+        mesh.receiveShadow = true;
         group.add(mesh);
     });
 }
@@ -93,7 +121,7 @@ function starCoordinates(innerRadius, outerRadius, z) {
 
     for (let i = 0; i < STAR_POINTS; ++i) {
         const offset = 3 * 2 * i;
-        buf[offset + 0] = Math.sin(STAR_SLICE * i) * outerRadius;
+        buf[offset] = Math.sin(STAR_SLICE * i) * outerRadius;
         buf[offset + 1] = Math.cos(STAR_SLICE * i) * outerRadius;
         buf[offset + 3] = Math.sin(STAR_SLICE * (i + 0.5)) * innerRadius;
         buf[offset + 4] = Math.cos(STAR_SLICE * (i + 0.5)) * innerRadius;