cocos creator3D扇形攻击区域？

Creator 3.x
#1

cocos creator3D中怎么实现在主角在敌人的扇形攻击区域会受到攻击？

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#2

先加一个圆形碰撞，再计算角度

#4

好的，我试试

#5

点在扇形的代表的圆内 && 点在扇形的开口角度内

如果主角是圆形的话参考这个(变量名别笑)

    public static collideArcCircle(cx: number, cy: number, cr: number, ax: number, ay: number, ar: number, adirx: number, adiry: number, aah: number): boolean
    {
        //扇形圆形指向圆心向量
        let dx = cx - ax;
        let dy = cy - ay;

    let dlen = Math.sqrt(dx * dx + dy * dy);

    //分离不相交
    if (dlen > cr + ar)
    {
        return false;
    }

    let c = Math.cos(aah);

    //如果扇形指向圆心的向量和扇形朝向的夹角小于扇形角度的一半, 说明相交
    if (this.dot(dx / dlen, dy / dlen, adirx, adiry) > c)
    {
        return true;
    }

    let s = Math.sin(aah);

    //将圆转换到扇形指向坐标系
    //x轴:(adirx, adiry)
    //y轴:(-adiry, adirx)
    let cax = dx * adirx + dy * adiry;
    let cay = dx * -adiry + dy * adirx;

    //扇形上边缘的点
    let px = c * ar;
    let py = s * ar;
    if (P5.collideLineCircle(0, 0, px, py, cax, cay, cr))
    {
        return true;
    }

    //扇形下边缘的点 对称的缘故只需要把圆关于x轴对称就好了
    if (P5.collideLineCircle(0, 0, px, py, cax, -cay, cr))
    {
        return true;
    }

    return false;
}
#6

大佬，可以把this.dot和p5.collideLineCircle函数的代码也给出看看吗

#7 
public static collideLineCircle(x1:number, y1:number, x2:number, y2:number, cx:number, cy:number, cr:number):boolean
    {
        // is either end INSIDE the circle?
        // if so, return true immediately
        var inside1 = this.collidePointCircle(x1, y1, cx, cy, cr);
        var inside2 = this.collidePointCircle(x2, y2, cx, cy, cr);
        if (inside1 || inside2) return true;

        // get length of the line
        var distX = x1 - x2;
        var distY = y1 - y2;
        var len = Math.sqrt((distX * distX) + (distY * distY));

        // get dot product of the line and circle
        var dot = (((cx - x1) * (x2 - x1)) + ((cy - y1) * (y2 - y1))) / Math.pow(len, 2);

        // find the closest point on the line
        var closestX = x1 + (dot * (x2 - x1));
        var closestY = y1 + (dot * (y2 - y1));

        // is this point actually on the line segment?
        // if so keep going, but if not, return false
        var onSegment = this.collidePointLine(closestX, closestY, x1, y1, x2, y2);
        if (!onSegment) return false;

        // draw a debug circle at the closest point on the line
        if (this._collideDebug)
        {
            this.ellipse(closestX, closestY, 10, 10);
        }

        // get distance to closest point
        distX = closestX - cx;
        distY = closestY - cy;
        var distance = Math.sqrt((distX * distX) + (distY * distY));

        if (distance <= cr)
        {
            return true;
        }
        return false;
    }
#8 
public static dot(x1: number, y1: number, x2: number, y2: number): number
{
    return x1 * x2 + y1 * y2;
}
#9

p5的内容库里的
https://github.com/bmoren/p5.collide2D/blob/master/p5.collide2d.js

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