Explosions in Libgdx with Box2d

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In a game I’m developing I wanted to have some realistic explosion effects. At first, I thought I would just apply an impulse to all objects within range of the explosion. However, this created unrealistic movement in the affected objects and the objects didn’t rotate. I tried using ray casts to set points to apply the forces to create rotation. This made the explosion look more realistic and worked well enough until the explosions exploded near a static body in which case objects would sometimes be missed as they were shielded by the static body. I decided to dive in fully and use particles to represent the force of the blast.

The first thing I made was an array to store where the explosions would explode and an array to store each particle from the explosion.

Next, I created the method that would be run for each explosion.

I needed to create a class for the Explosion particles which would contain a reference to the body. In this class, I create a body definition and use it to create a Body. The body position is then set to the place the bomb exploded. The linear velocity is then set to give the particle a direction and force. A Fixture is then created to give the body a shape, size, weight etc, and added to the body.

The Box2D world would soon fill up with particles unless they are removed once they’ve finished expelling all their energy.

In my contact listener I have this code to tell the game model to make an explosion

which runs this method in my Game Model

This is how the explosions look when using the box2D debug renderer.

[embedyt] http://www.youtube.com/watch?v=iN6Faut9g0A[/embedyt]


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