Matter.JS 检测两个静态传感器之间的碰撞 [英] Matter.JS Detect collision between two static sensors

问题描述

我正在尝试向我的游戏世界中添加一些可以四处移动的圆体.我需要检测它们何时发生碰撞，但也要让它们通过.

I'm trying to add some circle bodies to my game world that can be moved around. And i need to detect when they collide, but also let them passtrough.

我试图使圆圈 isSensor 和 Static - 未检测到碰撞.我试图让它们 isSensor 和 NO Static - 检测到碰撞，但它们因为重力/物理而跌落世界.我尝试移除物理但未检测到碰撞.

I've tried to make the circles isSensor and Static - no collision detected. I've tried to make them isSensor and NO Static - collision detected but they fall trough the world beucase of the gravity/physics. I've tried to remove the physics but no collision detected.

怎么办?

推荐答案

你可以使用你自己的碰撞检测和毕达哥拉斯定理，就像这样:

You can use your own collision detection with Pythagorean's theorum, like so:

Events.on(engine, 'beforeUpdate', function() {
    var circleAX = circleA.position.x;
    var circleAY = circleA.position.y;
    var circleBX = circleB.position.x;
    var circleBY = circleB.position.y;

    var dx = circleAX - circleBX;
    var dy = circleAY - circleBY;
    var dist = Math.sqrt(dy*dy + dx*dx);

    //substitute radiusA and radiusB for the radiuses of the circles
    if (dist < radiusA+radiusB) {
        //Collision
    }
});

为确保它们不会发生碰撞，请使用碰撞过滤器.

如果你追求高效率，这不是最好的方法.但是，除非您要检查数百个物体是否发生碰撞，否则它不应使游戏速度减慢到足以产生真正影响的程度.

To make sure they don't collide, use collisionFilter.

If you're going for high efficiency, this isn't the best way. However, it shouldn't slow the game down enough to make a real difference unless there's hundreds of objects you are checking for collisions.

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