Question 1

How do I make a body static in p2.js?

Accepted Answer

Set the body's mass to 0, as shown in the sample code where a ground plane is created with mass:0 to make it static and immovable. This is a common pattern for fixed objects like walls or floors.

Question 2

p2.js vs Matter.js: which is better for 2D games?

Accepted Answer

p2.js is more feature-rich with advanced constraints and performance optimizations like island solving, while Matter.js is often easier to use with better documentation. Choose p2.js for complex simulations like vehicles or ragdolls, and Matter.js for simpler, quicker projects.

Question 3

Can p2.js handle concave polygons?

Accepted Answer

Yes, using the Body.fromPolygon method to create concave shapes, but collision detection might be less efficient than with convex shapes. The documentation notes this as a supported feature for more complex geometry.

Question 4

How to add gravity in p2.js?

Accepted Answer

Specify gravity in the World constructor, like gravity:[0, -9.82] for downward acceleration, as demonstrated in the basic example. You can adjust the vector for different directions or strengths.

Question 5

Does p2.js work with Pixi.js for rendering?

Accepted Answer

Yes, there's an example in the README showing integration with Pixi.js, where p2.js handles physics and Pixi.js renders the graphics. This makes it suitable for web-based games and visualizations.

Question 6

What's the best way to optimize performance in p2.js?

Accepted Answer

Use sleep states for inactive bodies, enable island solving to reduce computations, and consider continuous collision detection (CCD) for fast-moving objects to prevent tunneling, as mentioned in the demos and features.

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