February 2018 – AR/VR-lab

A-Frame – dynamic JavaScript, code part (.js)

The below example shows using A-Frame together with JavaScript.

The example shows, how to animate a sphere on a plane.

This is the JavaScript part.

//creates shortcut for selecting DOM element
$ = (queryString) => document.querySelector(queryString);
//Change color of the sphere programmatically
//without animation
//$('a-sphere').setAttribute('color', 'blue');
/*
//our callback function
let count = 0;
const animate = () => {
 //do something
   /console.log(count++);
    requestAnimationFrame(animate);
}

requestAnimationFrame(animate);
*/
//create a state variable for hue
let hue = 0;
/*
Hue is one of the main properties (called color appearance parameters) of a color,
defined technically (in the CIECAM02 model), as "the degree to which a stimulus can be
described as similar to or different from stimuli that are described as red, green, blue, and yellow",
(which in certain theories of color vision are called unique hues).
read more at: https://en.wikipedia.org/wiki/Hue
 */
//function for changing color 60times a second
const shiftHue = (hue) => (hue + 1) % 360; //modulus 360, så the value never goes over 360.

//Change color of the sphere programmatically
//with animation using javascript requestAnimationFrame() method which calls our animate() callback 60 times/sec
//our callback function

const animate = () => {
    //every frame we will create a new hue
    hue = shiftHue(hue);
    const color = `hsl(${hue}, 100%, 50%)`; //hue, saturation, light
    const variation = Math.sin(Date.now() / 1000);
    const position = `0 ${1.5 + variation} -4`;

    $('a-sphere').setAttribute('color', color);
    $('a-sphere').setAttribute('position', position);
    $('a-plane').setAttribute('rotation', `-90 ${120 * variation} 0`);
    $('a-plane').setAttribute('color', color);

    requestAnimationFrame(animate);
};

//programmatic animation.
//requestAnimationFrame() will fire the callback when the browser is ready
//will do it 60 times/second
requestAnimationFrame(animate);

//creates shortcut for selecting DOM element

$ = (queryString) => document.querySelector(queryString);

//Change color of the sphere programmatically

//without animation

//$('a-sphere').setAttribute('color', 'blue');

//our callback function

let count = 0;

const animate = () => {

//do something

/console.log(count++);

requestAnimationFrame(animate);

}

requestAnimationFrame(animate);

//create a state variable for hue

let hue = 0;

Hue is one of the main properties (called color appearance parameters) of a color,

defined technically (in the CIECAM02 model), as "the degree to which a stimulus can be

described as similar to or different from stimuli that are described as red, green, blue, and yellow",

(which in certain theories of color vision are called unique hues).

read more at: https://en.wikipedia.org/wiki/Hue

//function for changing color 60times a second

const shiftHue = (hue) => (hue + 1) % 360; //modulus 360, så the value never goes over 360.

//Change color of the sphere programmatically

//with animation using javascript requestAnimationFrame() method which calls our animate() callback 60 times/sec

//our callback function

const animate = () => {

//every frame we will create a new hue

hue = shiftHue(hue);

const color = `hsl(${hue}, 100%, 50%)`; //hue, saturation, light

const variation = Math.sin(Date.now() / 1000);

const position = `0 ${1.5 + variation} -4`;

$('a-sphere').setAttribute('color', color);

$('a-sphere').setAttribute('position', position);

$('a-plane').setAttribute('rotation', `-90 ${120 * variation} 0`);

$('a-plane').setAttribute('color', color);

requestAnimationFrame(animate);

};

//programmatic animation.

//requestAnimationFrame() will fire the callback when the browser is ready

//will do it 60 times/second

requestAnimationFrame(animate);

A-Frame – dynamic JavaScript, HTML part

The below example shows using A-Frame together with JavaScript.

The example shows, how to animate a sphere on a plane.

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <script src="https://cdnjs.cloudflare.com/ajax/libs/aframe/0.7.1/aframe.js"></script>
    <title>Title</title>
</head>
<body>
<!--
Setting a-sphere attributes(color and posistion) manually
<a-scene>
    <a-sphere color="red" position="0 1.5 -2"></a-sphere>
    <! rotation is -90 because originally the plan is vertical and we want it horizontal e.g lying flat
     <a-plane width="10" height="10" position="0 0 -5" rotation="-90 0 0" color="black" ></a-plane>
</a-scene>
-->

<!--
Now when we have our javascript we will set attributes programmatically from index.js
Thus we will remove the color and position attributes from the a-sphere
-->
<a-scene>
    <a-sphere></a-sphere>
    <a-plane src="https://media.giphy.com/media/3o8doVAxrMjXbIHaU0/giphy.gif" width="8" height="8" position="0 0 -2" ></a-plane>
</a-scene>



<script src="index.js"></script>

</body>
</html>

<!DOCTYPE html>

<head>

<title>Title</title>

</head>

<body>

<!--

Setting a-sphere attributes(color and posistion) manually

<a-scene>

<a-sphere color="red" position="0 1.5 -2"></a-sphere>

<! rotation is -90 because originally the plan is vertical and we want it horizontal e.g lying flat

<a-plane width="10" height="10" position="0 0 -5" rotation="-90 0 0" color="black" ></a-plane>

</a-scene>

-->

<!--

Now when we have our javascript we will set attributes programmatically from index.js

Thus we will remove the color and position attributes from the a-sphere

-->

<a-scene>

<a-sphere></a-sphere>

<a-plane src="https://media.giphy.com/media/3o8doVAxrMjXbIHaU0/giphy.gif" width="8" height="8" position="0 0 -2" ></a-plane>

</a-scene>

</body>

</html>

A-Frame – a-cursor without click

The below example shows using a-cursor with no click event, but with mouseenter & moveleave events, which will show/hide a text (“HELLO WORLD!”) hovering over a box.

Please notice, that it is necessary to add a link to a JavaScript library containing the text component, and that the component only works with A-Frame releases from 0.4.0 and below!

<html>
  <head>
    <title>Demo a-cursor with no click</title>
    <script src="https://aframe.io/releases/0.4.0/aframe.min.js"></script>
    <script src="https://rawgit.com/bryik/aframe-bmfont-text-component/master/
				dist/aframe-bmfont-text-component.min.js"></script>

 </head>
  <body>
    <a-scene>
      <a-assets>
      </a-assets>

      <a-box color="blue" width="1" height="1"
              position="0 10 0"
              rotation="0 0 0"
              scale="1 2.5 1">
      </a-box>

     <a-entity scale="2 2 2" bmfont-text="text: HELLO WORLD!; color:white; size: 1.5; height:
				0.5; opacity:0" position="-0.27 9.28 0.91"></a-entity>

      <a-camera position="0 7 5">
        <a-cursor color="#FF0000" />
      </a-camera>

    </a-scene>

    <script type="text/javascript">
        var box = document.querySelector( 'a-box');
        var text = document.querySelector( 'a-entity');

        box.addEventListener( "mouseenter", function ()
        {
          text.setAttribute("bmfont-text",
          {
            opacity: 1
          });
        });

        box.addEventListener( "mouseleave", function ()
        {
         text.setAttribute("bmfont-text",
          {
            opacity: 0
          });
        });

    </script>

  </body>
</html>

<html>

<head>

<title>Demo a-cursor with no click</title>

dist/aframe-bmfont-text-component.min.js"></script>

</head>

<body>

<a-scene>

<a-assets>

</a-assets>

<a-box color="blue" width="1" height="1"

position="0 10 0"

rotation="0 0 0"

scale="1 2.5 1">

</a-box>

<a-entity scale="2 2 2" bmfont-text="text: HELLO WORLD!; color:white; size: 1.5; height:

0.5; opacity:0" position="-0.27 9.28 0.91"></a-entity>

<a-camera position="0 7 5">

<a-cursor color="#FF0000" />

</a-camera>

</a-scene>

var box = document.querySelector( 'a-box');

var text = document.querySelector( 'a-entity');

box.addEventListener( "mouseenter", function ()

{

text.setAttribute("bmfont-text",

{

opacity: 1

});

box.addEventListener( "mouseleave", function ()

{

text.setAttribute("bmfont-text",

{

opacity: 0

});

</script>

</body>

</html>

A-Frame – a-cursor with click

The below example shows using a-cursor, where a click event will rotate a box. Mouseenter & moveleave events will scale the box up and down.

<html>
  <head>
    <title>Demo a-cursor with click</title>
    <script src="https://aframe.io/releases/0.7.0/aframe.min.js"></script>

 </head>
  <body>
    <a-scene>
      <a-assets>
      </a-assets>

      <a-box color="blue" width="1" height="1" depth="1"
              position="0 10 0"
              rotation="45 45 45"
              scale="1 2.5 1">
          <a-animation attribute="rotation" begin="click" repeat="3" to="0 360 0"></a-animation>
      </a-box>

      <a-camera position="0 7 5">
        <a-cursor color="#FF0000" />
      </a-camera>

    </a-scene>

    <script type="text/javascript">
        var box = document.querySelector( 'a-box');
        box.addEventListener( "mouseenter", function ()
        {
          box.setAttribute("scale",
          {
            x: 0.5,
            y: 2,
            z: 5.9
          });
        });

        box.addEventListener( "mouseleave", function ()
        {
          box.setAttribute("scale",
          {
            x: 1,
            y: 2.5,
            z: 1
          });
        });

    </script>

  </body>
</html>

<html>

<head>

<title>Demo a-cursor with click</title>

</head>

<body>

<a-scene>

<a-assets>

</a-assets>

<a-box color="blue" width="1" height="1" depth="1"

position="0 10 0"

rotation="45 45 45"

scale="1 2.5 1">

<a-animation attribute="rotation" begin="click" repeat="3" to="0 360 0"></a-animation>

</a-box>

<a-camera position="0 7 5">

<a-cursor color="#FF0000" />

</a-camera>

</a-scene>

var box = document.querySelector( 'a-box');

box.addEventListener( "mouseenter", function ()

{

box.setAttribute("scale",

{

x: 0.5,

y: 2,

z: 5.9

});

box.addEventListener( "mouseleave", function ()

{

box.setAttribute("scale",

{

x: 1,

y: 2.5,

z: 1

});

</script>

</body>

</html>

Insert a logo in a 360 image

You make an 360 image, but want to hide the tripod, the artifacts of the stitching or just want to watermark your artwork with a mark of your own.

The simple way is to insert the text in a box in the bottom (~300px) of the image.

Panoramic image with text — Open the panoramic image in a image editor and insert at box with text in the bottom of the image. Then save it.

Thus it will cover the tripod etc. Due to the mapping of the image to a sphere the logo will be exposed to a spheric compression making it look “blown up”.

Bottom plate shown in 360 image — When shown as a sphere the 360 will have a logo like this.

If you’re inclined to show off, you can also spend a little more time and make it look “awesome”, or, just pretend to have too much time on your hands.

Spiral bottom plate in speric image — Using the right combination of distortion-effects can enable nice results

panorama with sphered footer — I may look weird, but when mapped to a sphere, it becomes distorted back to how it was supposed to look

Technique is shown in this video-tutorial.

A-Frame – controls

The below example shows using controls on a 3D model of Axeltorv (Næstved) in the .glTF format.

<html>
  <head> 
    <title>Urban Power model - Axeltorv</title>
   <script src="https://aframe.io/releases/0.7.0/aframe.min.js"></script>
  <script src="https://rawgit.com/fernandojsg/aframe-teleport-controls/master/dist/aframe-teleport-controls.min.js"></script>
  </head>
  <body>
    <a-scene>
        <a-asset-item id="axeltorv" src="20180131_axeltorv.gltf"></a-asset-item>

       <a-entity gltf-model="#axeltorv" scale="0.1 0.1 0.1" rotation="-86 -133 174" position="-2.11 -9.05 -1.32"></a-entity>

       <a-entity id="cameraRig">
      		<a-entity id="head" camera wasd-controls look-controls></a-entity>
     		<a-entity id="left-hand" teleport-controls="cameraRig: #cameraRig; teleportOrigin: #head;" gearvr-controls></a-entity>
      		<a-entity id="right-hand" teleport-controls="cameraRig: #cameraRig; teleportOrigin: #head;" gearvr-controls></a-entity>
      </a-entity>
 
      <a-sky color="#599"></a-sky>    
    
   </a-scene>
 
  </body>
</html>

<html>

<head>

<title>Urban Power model - Axeltorv</title>

</head>

<body>

<a-scene>

<a-asset-item id="axeltorv" src="20180131_axeltorv.gltf"></a-asset-item>

<a-entity gltf-model="#axeltorv" scale="0.1 0.1 0.1" rotation="-86 -133 174" position="-2.11 -9.05 -1.32"></a-entity>

<a-entity id="cameraRig">

<a-entity id="head" camera wasd-controls look-controls></a-entity>

<a-entity id="left-hand" teleport-controls="cameraRig: #cameraRig; teleportOrigin: #head;" gearvr-controls></a-entity>

<a-entity id="right-hand" teleport-controls="cameraRig: #cameraRig; teleportOrigin: #head;" gearvr-controls></a-entity>

</a-entity>

<a-sky color="#599"></a-sky>

</a-scene>

</body>

</html>

A-Frame – 3D models

The below example shows a ready-made 3D model downloaded from Google Blocks – the 3D model is a rocket shown beside three primitives.

<head>
	
	<title>A-frame primitives & 3D object demo</title>

	<script src="https://aframe.io/releases/0.7.0/aframe.min.js"></script>

</head>

<body>
	
	<a-scene>
  		<a-assets>
  			<a-asset-item id="mtl" src="./materials.mtl"></a-asset-item>
  			<a-asset-item id="obj" src="./model.obj"></a-asset-item>
		</a-assets>
  		<a-sphere position="0 1.25 -5" radius="1.25" color="#EF2D5E"></a-sphere>
  		<a-box position="-1 0.5 -3" rotation="0 45 0" width="1" height="1" depth="1" color="#4CC3D9"></a-box>
  		<a-cylinder position="1 0.75 -3" radius="0.5" height="1.5" color="#FFC65D"></a-cylinder>
  		<a-plane position="0 0 -4" rotation="-90 0 0" width="4" height="4" color="#7BC8A4"></a-plane>
  		<a-sky color="#ECECEC"></a-sky>
  		<a-entity obj-model="obj: #obj; mtl: #mtl;" position="5.395 1.892 -1.221" scale="1 1 1">
  		</a-entity>
	</a-scene>

</body>

<head>

<title>A-frame primitives & 3D object demo</title>

</head>

<body>

<a-scene>

<a-assets>

<a-asset-item id="mtl" src="./materials.mtl"></a-asset-item>

<a-asset-item id="obj" src="./model.obj"></a-asset-item>

</a-assets>

<a-sphere position="0 1.25 -5" radius="1.25" color="#EF2D5E"></a-sphere>

<a-box position="-1 0.5 -3" rotation="0 45 0" width="1" height="1" depth="1" color="#4CC3D9"></a-box>

<a-cylinder position="1 0.75 -3" radius="0.5" height="1.5" color="#FFC65D"></a-cylinder>

<a-plane position="0 0 -4" rotation="-90 0 0" width="4" height="4" color="#7BC8A4"></a-plane>

<a-sky color="#ECECEC"></a-sky>

<a-entity obj-model="obj: #obj; mtl: #mtl;" position="5.395 1.892 -1.221" scale="1 1 1">

</a-entity>

</a-scene>

</body>