轨道力学 [英] Orbital Mechanics

问题描述

有没有人有实施轨道力学（最好在XNA）的例子吗？我目前正在使用的代码如下，但它并没有感觉正确在执行时。对象只是不断弯曲非常轻微的星球，不管我多么调整变量我不能让它进入轨道，甚至部分轨道。

  shot.Position + = shot.Velocity; 
 
的foreach（雪碧星球行星）
 {
 Vector2 directionToPlanet =（planet.Position  -  shot.Position）; 
 directionToPlanet.Normalize（）; 
 
浮动距离= Vector2.DistanceSquared（shot.Position，planet.Position）; 
 
浮动gPull =（浮点）（planet.gravityStrength *（* planet.Mass shot.Mass）/距离）+ planet.gravityField; 
 shot.Position + =新Vector2（directionToPlanet.X * gPull，directionToPlanet.Y * gPull）; 
} 
  

修改
标Mendelt的回答正确您指出我需要更新速度，而不是位置。我还需要gPull计算改为

 浮动gPull = shot.Mass * planet.Mass / distanceSqr * planet.gStr ; 
  

解决方案

在您要更新的位置的最后一行拍摄。你应该更新速度。

您可能想看看代码在这个博文的 http://blog.mendeltsiebenga.com/post/Fun-with-planets.aspx 没有XNA，但工作轨道力学。 （虽然我从来没有摆脱了屏幕闪烁）

Does anyone have an example of implementing Orbital Mechanics (preferably in XNA)? The code I am currently using is below, but it doesn't "feel right" when it executes. The object just bends ever so slightly to the planet, and no matter how much I tweak the variables I cant get it to enter an orbit, or even a partial orbit.

shot.Position += shot.Velocity;  

foreach (Sprite planet in planets)  
{  
  Vector2 directionToPlanet = (planet.Position - shot.Position);  
  directionToPlanet.Normalize();  

  float distance = Vector2.DistanceSquared(shot.Position, planet.Position);  

  float gPull = (float)(planet.gravityStrength * (planet.Mass * shot.Mass) / distance) + planet.gravityField;  
  shot.Position += new Vector2(directionToPlanet.X * gPull, directionToPlanet.Y * gPull);  
}

Edit Marking Mendelt's answer correct for pointing out that I need to update the velocity, not the position. I also needed to change the calculation of gPull to

float gPull = shot.Mass * planet.Mass / distanceSqr * planet.gStr;

解决方案

In the last line you're updating the position of the shot. You should be updating the velocity.

You might want to take a look at the code in this blogpost http://blog.mendeltsiebenga.com/post/Fun-with-planets.aspx No xna, but working orbital mechanics. (although i never got rid of the screen-flicker)

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