dyn4j Forum

Can u post the code that doesn't work please? Which sample did you start with? Does the sample work before you modify it? What version of the library are you using?

We can only speculate what is wrong right now.

William

Would the direction of allowed motion change? If so, is the change of direction controlled by user input? I think a valid constraint (Joint) would be the most stable, but that is definitely more effort if made to fit your specific need. You could probably get away with just copying the PrismaticJoin...

I understand you may be frustrated, but it's difficult for us to offer help without more information. Zoom is correct, we need some way to replicate and the best way to do so would be through a code sample. Have you tried to run any of the samples here? https://github.com/wnbittle/dyn4j/tree/master/...

How is the player body controlled?

Can you supply the sizes and coordinates for the shapes when they are overlapping like this?

William

You are probably better off using the StepAdapter class so you don't have to implement all the methods. Here's a simple example: /// defined elsewhere public class MyStepListener extends StepAdapter { private final Body body; public MyStepListener(Body body) { this.body = body; } public void...

Can you provide more details about what you would use the information for? The reason I ask is that the physics engine may update a body's position every frame, so having that level of knowledge may not be sufficient to achieve your goal. On a simple level, you could store the position of the body e...

One option is extending the AbstractBounds class and implementing the isOutside method. You are given a collidable, which will have a list of fixtures. You would iterate those fixtures and check if they are all outside the circle. This can be done in a number of ways, but the easiest might be to cre...

It will depend on the shape: Shapes that implement Wound will have getVertices() and getNormals() methods: Link, Segment, Polygon, Rectangle, Triangle. The other shapes; Circle, Ellipse, HalfEllipse, and Slice have curved features so technically have an infinite number of vertices. Each one is store...

@Angelli I don't think the number of polygons was the issue, but rather the shape of the polygons. Thin shapes can cause problems with physics engines - I can explain more if anyone is interested. I think the take away from this thread should be: ⋅ Concave shapes *are* possible in dyn4j by...

Yeah, it will be difficult to determine the problem without some code. From your videos it looked like the 'barrels' where fixed to the body. In that case, why not just add them as extra fixtures? Is this what you are trying to do? You could probably do this much better, it's just a quick example. p...