3D烟花影响C / C ++采用正弦或余弦函数 [英] 3D Fireworks Effect in C/C++ using sine or cosine function

问题描述

我想实现的焰火效果C.我有尺寸10x10x10的立方体。火箭从地面开始，当它到达八楼它爆炸。下面是我不能做点 - 爆炸。我怎样才能实现这个用正弦或余弦函数？

I am trying to implement fireworks effect in C. I have a cube with dimensions 10x10x10. A rocket starts from the ground, and when it reaches 8th floor it explodes. Here's the point I cannot do - the explosion. How can I implement this using sine or cosine function?

所以在点（5,0,7）//（X，Y，Z）//火箭进入空气中的

so in point(5,0,7) //(x,y,z)// a rocket goes in the air

for (j=0; j<9; j++) {
    setpoint(x, y, j);
    delay(100);
    clean();  //clears everything
}

下面来点，使爆炸。这可怎么实现？它可以在随机位置神采奕奕了。先谢谢了。

Here comes the point to make the explosion. How this can be achieved? It can sparkle in random positions, too. Thanks in advance.

推荐答案

这是更好地做到这一点使用一个倒置的抛物线，而不是正弦/余弦。在爆炸点给每个粒子一个随机的水平速度。这个速度是恒定直到粒子撞击地面。你还需要给每个粒子随机垂直速度。这一次，但是，你的比例添加量，以这样的速度，以 -0.5 * G * DT ^ 2 （严格地说，这是错误的数字，但你赢了不会注意到除非你做科学的分析）。在这里，先按g 是加速度由于重力和 DT 的时间步长。这就是全部。

It's better to do this using an upside down parabola instead of sin/cos. At the point of explosion give each particle a random horizontal speed. This speed is constant till the particle hits the ground. You also need to give each particle a random vertical speed. this time, however, you'll add to this speed an amount proportional to -0.5*g*dt^2 (strictly speaking, this is numerically wrong, but you won't notice unless you're doing scientific analysis). Here, g is the acceleration due to gravitation and dt is the time step. That's all.

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