[WebGL] Leap Motion Controller 2

이번 글은 Leap Motion Controller를 이용한 오브젝트 컨트롤에 대한 두번째 예제이다. 아쉽게도 현재 필자는 개발 당시에는 Leap Motion Controller를 가지고 있었으나, 현재는 보유하고 있지 않아 본 테스트 프로젝트가 제대로 작동하는지 검증을 할 수 없는 상태이다.

다만, 개발 당시에는 본 테스트 프로젝트가 정상 작동하였었기 때문에 일단 올려본다. Leap Motion Controller를 가지고 계신 분은 테스트 해 보시기 바란다.

[Download Project]

11-02-leap-motion-2.zip

FULL SCREEN

[main.js]

// standard global variables
var container, scene, camera, renderer, controls, stats;
var keyboard = new THREEx.KeyboardState();

// custom global variables
var mesh;

init();
animate();

// FUNCTIONS
function init()
{
	// SCENE
	scene = new THREE.Scene();

	// CAMERA
	var SCREEN_WIDTH = window.innerWidth, SCREEN_HEIGHT = window.innerHeight;
	var VIEW_ANGLE = 45, ASPECT = SCREEN_WIDTH / SCREEN_HEIGHT, NEAR = 0.1, FAR = 10000;
	camera = new THREE.PerspectiveCamera( VIEW_ANGLE, ASPECT, NEAR, FAR);
	camera.position.set(0,200,400);	
	// camera.lookAt(scene.position);
	scene.add(camera);

	// RENDERER
	if ( Detector.webgl )
		renderer = new THREE.WebGLRenderer( {antialias:true} );
	else
		renderer = new THREE.CanvasRenderer();
	renderer.setSize(SCREEN_WIDTH, SCREEN_HEIGHT);
	container = document.getElementById( 'ThreeJS' );
	container.appendChild( renderer.domElement );

	// EVENTS
	THREEx.WindowResize(renderer, camera);
	THREEx.FullScreen.bindKey({ charCode : 'f'.charCodeAt(0) });

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

	// STATS
	stats = new Stats();
	stats.domElement.style.position = 'absolute';
	stats.domElement.style.bottom = '0px';
	stats.domElement.style.zIndex = 100;
	container.appendChild( stats.domElement );

	// LIGHT
	var light = new THREE.PointLight(0xffffff);
	light.position.set(0,500,500);
	scene.add(light);

	// FLOOR
	var floorTexture = new THREE.ImageUtils.loadTexture( 'img/Wood_floor.jpg' );
	floorTexture.wrapS = floorTexture.wrapT = THREE.RepeatWrapping;
	floorTexture.repeat.set( 10, 10 );
	var floorMaterial = new THREE.MeshBasicMaterial( { map: floorTexture, side: THREE.DoubleSide, transparent: true, opacity:0.05 } );
	var floorGeometry = new THREE.PlaneGeometry(1000, 1000, 10, 10);
	var floor = new THREE.Mesh(floorGeometry, floorMaterial);
	floor.position.y = -200.5;
	floor.rotation.x = -Math.PI / 2;
	//scene.add(floor);

	// SKYBOX
	var skyBoxGeometry = new THREE.CubeGeometry( 10000, 10000, 10000 );
	var skyBoxMaterial = new THREE.MeshBasicMaterial( { color: 0x000000, side: THREE.BackSide } );
	var skyBox = new THREE.Mesh( skyBoxGeometry, skyBoxMaterial );
	scene.add(skyBox);
	
	////////////
	// CUSTOM //
	////////////
	this.lightMaterial = new THREE.MeshLambertMaterial( { color: 0xcccc00, side: THREE.DoubleSide, transparent:true, opacity:0.75  } );
	this.darkMaterial  = new THREE.MeshLambertMaterial( { color: 0x333300, side: THREE.DoubleSide, transparent:true, opacity:0.75  } );
	this.redMaterial   = new THREE.MeshBasicMaterial( { color: 0xcc0000, side: THREE.DoubleSide, transparent:true, opacity:0.75 } );
	this.greenMaterial = new THREE.MeshBasicMaterial( { color: 0x00cc00, side: THREE.DoubleSide, transparent:true, opacity:0.75 } );
	this.blueMaterial  = new THREE.MeshBasicMaterial( { color: 0x0000cc, side: THREE.DoubleSide, transparent:true, opacity:0.75 } );

	// sphere for hand
	var handGeometry = new THREE.SphereGeometry( 10, 32, 16 );
	this.handMesh = new THREE.Mesh( handGeometry, darkMaterial );
	handMesh.position.set(0,40,0);
	scene.add(handMesh);
	
	// sphere angle indicators
	var handAngleGeometry = new THREE.CircleGeometry( 20, 16 );
	// XY
	var handAngleMesh = new THREE.Mesh( handAngleGeometry.clone(), blueMaterial );
	handMesh.add(handAngleMesh);
	// XZ
	var handAngleMesh = new THREE.Mesh( handAngleGeometry.clone(), greenMaterial );
	handAngleMesh.rotation.x = -Math.PI / 2;
	handMesh.add(handAngleMesh);
	// YZ
	var handAngleMesh = new THREE.Mesh( handAngleGeometry.clone(), redMaterial );
	handAngleMesh.rotation.y = -Math.PI / 2;
	handMesh.add(handAngleMesh);

	// spheres for fingertips
	this.fingerMeshArray = [];
	for (var i = 0; i < 5; i++)
	{
		var geometry = new THREE.SphereGeometry( 5, 16, 8 );
		var fingerMesh = new THREE.Mesh( geometry, lightMaterial );
		fingerMeshArray.push( fingerMesh );
		scene.add( fingerMesh );
	}

	// cylinders for length of finger(s)
	this.fingerLengthArray = [];
	for (var i = 0; i < 5; i++)
	{
		var fingerLength = cylinderMesh( new THREE.Vector3(0,0,0), new THREE.Vector3(0,1,0) );
		fingerLength.scale.y = 100;
		fingerLength.material = lightMaterial;
		fingerLengthArray.push( fingerLength );
		scene.add( fingerLength );
	}
	
	// "shadows", to help judge 3D distance. 
	// TODO: change scale based on distance from object to plane.
	this.handShadow = new THREE.Mesh( new THREE.CircleGeometry( 10, 16 ), darkMaterial );
	handShadow.position.y = floor.position.y + 1;
	handShadow.rotation.x = floor.rotation.x;
	scene.add( handShadow );
	
	this.fingerShadowArray = [];
	for (var i = 0; i < 5; i++)
	{
		var geometry = new THREE.CircleGeometry( 5, 16 );
		var fingerShadow = new THREE.Mesh( geometry, lightMaterial );
		fingerShadow.position.y = floor.position.y + 1;
		fingerShadow.rotation.x = floor.rotation.x;
		fingerShadowArray.push( fingerShadow );
		scene.add( fingerShadow );
	}

	/*
	// for displaying curvature of hand/finger positions
	this.curveBall = new THREE.Mesh( new THREE.SphereGeometry(50, 32, 16), 
		new THREE.MeshBasicMaterial( {color: 0xffff00, transparent: true, wireframe: true} ) );
	scene.add( curveBall );
	*/
}

// create a cylinder with given start pointX and terminus pointY
function cylinderMesh( pointX, pointY )
{
	// edge from X to Y
	var direction = new THREE.Vector3().subVectors( pointY, pointX );
	
	var arrow = new THREE.ArrowHelper( direction.clone().normalize(), pointX, direction.length() );
		
	// cylinder: radiusAtTop, radiusAtBottom, height, segmentsAroundRadius, segmentsAlongHeight
	var edgeGeometry = new THREE.CylinderGeometry( 2, 2, direction.length(), 6, 4 );

	var edgeMesh = new THREE.Mesh( edgeGeometry, new THREE.MeshBasicMaterial( { color: 0x0000ff } ) );
	edgeMesh.position = new THREE.Vector3().addVectors( pointX, direction.multiplyScalar(0.5) );
	edgeMesh.setRotationFromEuler( arrow.rotation );
	return edgeMesh;
}

function animate()
{
    requestAnimationFrame( animate );
	render();
	update();
}

function update()
{
	if ( keyboard.pressed("z") )
	{
		// do something
	}

	controls.update();
	stats.update();
}

// the LeapMotion update function
Leap.loop( {enableGestures: true}, function( frame )
{

	for (var i = 0; i < 5; i++)
	{
		fingerMeshArray[i].visible = false;
		fingerLengthArray[i].visible = false;
		fingerShadowArray[i].visible = false;
	}

	handData = frame.hands[0];
	
	if ( !handData )
	{
		handMesh.material   = darkMaterial;
		handShadow.material = darkMaterial;
		return;
	}
	
	handMesh.position.set( handData.palmPosition[0], handData.palmPosition[1] - 200, handData.palmPosition[2] );
	handMesh.material = lightMaterial;
		
	handMesh.rotation.set(0,0,0);
	handMesh.rotateX(  Math.atan2( handData.palmNormal[1], -handData.palmNormal[2] ) );
	handMesh.rotateY( -Math.atan2( handData.palmNormal[0], -handData.palmNormal[1] ) );

	handShadow.position.x = handData.palmPosition[0];
	handShadow.position.z = handData.palmPosition[2];
	handShadow.material = lightMaterial;

	var	handPosition = new THREE.Vector3( handData.palmPosition[0], handData.palmPosition[1] - 200, handData.palmPosition[2] );
	for (var i = 0; i < Math.min(frame.pointables.length,5); i++)
	{
		var pointer = frame.pointables[i];
		fingerMeshArray[i].visible = true;
		fingerMeshArray[i].position.set( pointer.tipPosition[0], pointer.tipPosition[1] - 200, pointer.tipPosition[2] );

		fingerLengthArray[i].visible = true;
		var fingerPosition = new THREE.Vector3( pointer.tipPosition[0], pointer.tipPosition[1] - 200, pointer.tipPosition[2] );
		var direction = new THREE.Vector3().subVectors( fingerPosition, handPosition );
		var arrow = new THREE.ArrowHelper( direction.clone().normalize(), handPosition, direction.length() );
		fingerLengthArray[i].position = new THREE.Vector3().addVectors( handPosition, direction.clone().multiplyScalar(0.5) );
		fingerLengthArray[i].setRotationFromEuler( arrow.rotation );
		fingerLengthArray[i].scale.y = direction.length();
		
		fingerShadowArray[i].visible = true;
		fingerShadowArray[i].position.x = pointer.tipPosition[0];
		fingerShadowArray[i].position.z = pointer.tipPosition[2];
	}
    
	/*
	scene.remove(curveBall);
	curveBall = new THREE.Mesh( new THREE.SphereGeometry( handData.sphereRadius / 1.1, 32, 16 ), curveBall.material );
	curveBall.position.set( handData.sphereCenter[0], handData.sphereCenter[1] - 200, handData.sphereCenter[2]  );
	scene.add(curveBall);
	*/
	
	// gesture debugging
	var n = frame.gestures.length;
	if (n > 0) 
	{
		for (var i = 0; i < n; i++)
		{
			console.log( frame.gestures[i] );
		}
	}
	
});
// end of LeapMotion update

function render()
{
	renderer.render( scene, camera );
}