minimap

scissorTest is important!

by jmcjc5u

HTML

<div id="info">Mini Map
</div>
<script src="https://threejs.org/build/three.min.js"></script>
<script src="https://threejs.org/examples/js/controls/OrbitControls.js">
</script>
<script src="https://jyunming-chen.github.io/tutsplus/js/KeyboardState.js"></script>

CSS

#info {
  position: absolute;
  top: 0px;
  width: 100%;
  padding: 10px;
  text-align: center;
  color: #ffff00
}

body {
  overflow: hidden;
}

JavaScript

var camera, scene, renderer;
var cameraHUD1, cameraHUD2, sceneHUD;
var keyboard = new KeyboardState();

init();
animate();

function initHUD() {
  // sceneHUD: a simple line boundary
  sceneHUD = new THREE.Scene();
  cameraHUD1 = new THREE.OrthographicCamera(-10.5, 10.5, 10.5, -10.5, -50, 50);
  cameraHUD1.position.z = 20;  // for border
  
  cameraHUD2 = new THREE.OrthographicCamera(-15,15,15,-15,-35,35);
  cameraHUD2.position.set (0,30,0)
  cameraHUD2.up.set (0,0,-1)   // for top view
  cameraHUD2.lookAt (new THREE.Vector3())

  let points = [];
  points.push (
    new THREE.Vector3(-10, -10, 0),
    new THREE.Vector3(10, -10, 0),
    new THREE.Vector3(10, 10, 0),
    new THREE.Vector3(-10, 10, 0),
    new THREE.Vector3(-10, -10, 0));
  var lineGeometry = new THREE.BufferGeometry().setFromPoints (points);
    
  var line = new THREE.Line(lineGeometry,
    new THREE.LineBasicMaterial({
      color: 0xffffff
    }));
  sceneHUD.add(line);
  
}

function init() {

  renderer = new THREE.WebGLRenderer();
  renderer.setSize(window.innerWidth, window.innerHeight);
  renderer.setClearColor(0x888800);
  document.body.appendChild(renderer.domElement);
  
  scene = new THREE.Scene();

  camera = new THREE.PerspectiveCamera(50, window.innerWidth / window.innerHeight, 1, 1000);
  camera.position.z = 25;

	let controls = new THREE.OrbitControls(camera, renderer.domElement);

	/////////////////////////////////////////////
  var geometry = new THREE.BoxGeometry(10, 2, 2);
  var material = new THREE.MeshLambertMaterial();

  var mesh = new THREE.Mesh(geometry, material);
  scene.add(mesh);

  var light = new THREE.PointLight(0xffffff);
  light.position.set(100, 300, 200);
  scene.add(light);

  var gridXZ = new THREE.GridHelper(20, 10, 'red', 'white');
  scene.add(gridXZ);

	initHUD();
  renderer.autoClear = false;

}

function animate() {

  requestAnimationFrame(animate);
  render();

}

function render() {

  var WW = window.innerWidth;
  var HH = window.innerHeight;

 //...