Fresenel camera-controls

by Vinni

HTML

<script src="//cdn.rawgit.com/mrdoob/three.js/master/build/three.min.js"></script>
<script src="https://unpkg.com/camera-controls@1.33.2/dist/camera-controls.js"></script>

<script src="https://threejs.org/examples/js/controls/OrbitControls.js"></script>

CSS

body {
	  margin: 0;
}

JavaScript

var FresnelShader = {

	uniforms: {},

	vertexShader: [
	
		"varying vec3 vPositionW;",
		"varying vec3 vNormalW;",

		"void main() {",

		"	vPositionW = vec3( vec4( position, 1.0 ) * modelMatrix);",
		" vNormalW = normalize( vec3( vec4( normal, 0.0 ) * modelMatrix ) );",

		"	gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );",

		"}"

	].join( "\n" ),

	fragmentShader: [
	
		"varying vec3 vPositionW;",
		"varying vec3 vNormalW;",

		"void main() {",
		
		"	vec3 color = vec3(1., 1., 1.);",
		"	vec3 viewDirectionW = normalize(cameraPosition - vPositionW);",
		"	float fresnelTerm = dot(viewDirectionW, vNormalW);",
		"	fresnelTerm = clamp(1.0 - fresnelTerm, 0., 1.);",
    " float opacity = fresnelTerm;",

		"	gl_FragColor = vec4( color, opacity);",

		"}"

	].join( "\n" )

};


CameraControls.install( { THREE: THREE } );

var camera, scene, renderer;
var geometry, material, mesh, clock, cameraControls;

init();
animate();

function init() {

		

    camera = new THREE.PerspectiveCamera( 70, window.innerWidth / window.innerHeight, 0.01, 10 );
    camera.position.z = 5;

    scene = new THREE.Scene();

    geometry = new THREE.TorusKnotBufferGeometry( 1, 0.3, 128, 16 );
    material = new THREE.ShaderMaterial( {
			vertexShader: FresnelShader.vertexShader,
			fragmentShader: FresnelShader.fragmentShader
		});
    material.transparent = true;

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

    renderer = new THREE.WebGLRenderer( { antialias: true } );
    renderer.setSize( window.innerWidth, window.innerHeight );
    document.body.appendChild( renderer.domElement );
		
		// var controls = new THREE.OrbitControls( camera, renderer.domElement );
    cameraControls = new CameraControls( camera, renderer.domElement );
    clock = new THREE.Clock();

}

function animate() {
    requestAnimationFrame( animate );
    
    const delta = clock.getDelta();
    cameraControls.update( delta );

    renderer.render( scene, camera );

}