Box2D Map Collision

Game Mechanics
#1

I would like to have a way to make maps in a map editor (tiled) and be able to add box2d collision detection to it. I have already seen Aurelion Ribon’s program, however that doesn’t seem to work with large map images. Is there a simple way to do this? If not, is there anyway you would suggest it? While looking around, I found that you can export a an xml file, so I was thinking that maybe in runtime I make my program look at the tiles and if the id equals one that is collidable add a box2d body around it? This is a topdown game as well. Anything helps! Thanks, -cMp

#2

Define a box2d body for each map tile.
http://dpk.net/2011/05/08/libgdx-box2d-tiled-maps-full-working-example-part-23/#p1

Uses the outdated map api but everything else is the same.

#3

That’s what I was thinking, but would it cause performance or memory issues due to the large number of tiles on the map?

#4

I doubt it, as long as the bodies are static.

#5

I manage to do that yesterday with this:

BodyDef def = new BodyDef();
		PolygonShape shape = new PolygonShape();
		int current_body = 0;

		for (MapObject object : mapa.getLayers().get(1).getObjects()) {
			if (object instanceof RectangleMapObject) {
				Rectangle rect = ((RectangleMapObject) object).getRectangle();

				shape.setAsBox((rect.width / 2) / 10, (rect.height / 2) / 10);

				def.position.x = (rect.x / 10) + ((rect.width / 10) / 2);
				def.position.y = (rect.y / 10) + ((rect.height / 10) / 2);

				cuerpos.add(world.createBody(def));
				cuerpos.get(current_body).createFixture(shape, 1);
			}

			else if (object instanceof PolygonMapObject) {
				Polygon poly = ((PolygonMapObject) object).getPolygon();

				float vertices[] = poly.getTransformedVertices();

				for (int x = 0; x < vertices.length; x++) {
					vertices[x] /= 10;
				}
				System.out.println(vertices[0]);
				shape.set(vertices);
				def.position.x = poly.getOriginX() / 10;
				def.position.y = poly.getOriginY() / 10;

				cuerpos.add(world.createBody(def));
				cuerpos.get(current_body).createFixture(shape, 1);
			}

			current_body++;
		}

This code works only for rectangles and polygons but if think a bit you will be able to make it ellipse and polyline friendly

#6

Probably a bit too late but whatever: this (this)

#7

It’s not too late :), thank you very much for that, you’ve been really helpful!