Tutorials

Procedural Levels

This project uses clone() function on the Entity to randomly generate a level from Entities that have been created in the Editor.

Try it from the Editor in the tutorial project.

This script below is a very simple level generation program. It takes two Entities that have been setup in the Editor: 'Grass' and 'House' and uses them as tiles for a grid based level. The level is created by randomly choosing one of the tiles, cloning the tile to create a new Entity, then placing the new Entity at the correct grid position.

var Generate = pc.createScript('generate');

Generate.attributes.add('numTilesX', {
    type: 'number',
    default: 10
});

Generate.attributes.add('numTilesY', {
    type: 'number',
    default: 10
});

// initialize code called once per entity
Generate.prototype.initialize = function() {
    // We've created a couple of templates that are our world tiles
    // In the Editor hierarchy, we have disabled the templates because
    // we don't want them to be visible. We just want our generated
    // world to be visible
    var templates = this.app.root.findByName('Templates');
    var grass = templates.findByName('Grass');
    var house = templates.findByName('House');

    for (var y = 0; y < this.numTilesY; y++) {
        for (var x = 0; x < this.numTilesX; x++) {
            // Pick a tile at random, with grass more likely than a house
            var tile = (Math.random() > 0.8) ? house : grass;

            // Clone the tile
            var e = tile.clone();

            // Set the world position of the cloned tile. Note that because
            // our tiles are 10x10 in X,Z dimensions, we have to multiply
            // the position by 10
            e.setPosition((x - this.numTilesX / 2) * 10, 0, (y - this.numTilesX / 2) * 10);

            // Add the tile to the scene's hierarchy
            this.app.root.addChild(e);
        }
    }
};
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