Chamber of the Painted Table

Click Here to interact (Works in Chrome, works better in Safari).

This is the second of my "A Song of Ice and Fire" webkit experiments. The first was a simple animation built using a pretty sweet WYSIWYG. This one is a little more complex. I wanted to experiment with manipulating 3d objects, but didn't want to get bogged down with complicated framework. Webkit-3d transforms seemed like the ticket.

I've create a scene inspired by Aegon the Conqueror's Painted Table. There is a map of westeros on a large table with a spinning dice. Each face has the sigil of a major house on it (all of them involved in Aegon's War of Conquest). I attempted to add floors and walls, but the browser just couldn't handle it. It could be possible to reduce the size of the objects and simply create a smaller scene.

Transforms

To create the objects in the scene square divs are rotated and translated into position, adjusting transform origin where necessary. When transforming shapes within other transformed shapes the -webkit-transform-style attribute must be set to 'preserve-3d', otherwise the transforms will be projected onto the 'surface' of the container as 2d objects. Three containers serve as examples for the different attributes used to position the shapes.

#dice{
 -webkit-transform-style: preserve-3d;
 -webkit-transform-origin: 200px 200px;
 -webkit-transform: rotateX(45deg) rotateY(45deg);
}
#dice_tilt{
 -webkit-transform-style: preserve-3d;
 -webkit-transform-origin: 200px 200px;
 -webkit-transform: rotateY(15deg);
}
#dice_wrapper{
-webkit-transform-origin: 200px 200px;
 -webkit-transform: scaleX(0.3) scaleY(0.3) scaleZ(0.3) translateZ(335px);
}

The dice is rotated on is X and Y axis to make it stand on it point. The dice tilt rotates the dice to one side slightly to allow for a wobbly look, and the dice wrapper is moved above the table and is scaled down to 1/3 normal size.

The animation is based on a ~30 hz timer that updates the rotation of the Dice, and the dice tilt, to create the  the wobbling dice look. The dice_tilt has the inner rotation and the dice wrapper has the wobble (half speed rotation speed) applied to it.

Sprite3d and Matrix Transforms

The Sprite3d class allows the rotation, scale and translation of a div to be set; adjust the transform center, and the transform matrix to be recalculated on request. The class uses the sylvester.js http://sylvester.jcoglan.com/ library to combine the transforms before applying them to the -webkit-transform atribute.

View Change

The rest is simply capturing keyboard input and updating the transform values of the objects. I split rotation x, rotation z, and translation divs, the rotation axis are a little strange if all the transformations are applied to the same function.