I am trying to simulate an accurate 2D sim of our solar system. I figured if I have the Apoapsis & Periapsis Distances from the object I'm orbiting, and (I think) I know that these points are 180 deg apart, that I could just Mathf.Lerp the distance & get the points using distance & angle
![But this is what turns out. See below for Code][1]
[1]: E:\Backjup+19+Nov\Pictures+(E)\Image1.jpg
void DrawEllipse()
{
//The Line that will draw the orbit
LineRenderer orbitLine = GetComponent ();
orbitLine.useWorldSpace = true;
//the "Half ellipse" from Apoapsis to Periapsis
pointsToPeriapsis = new Vector3[halfOfLineSegments];
//The other half
pointsToApoapsis = new Vector3[halfOfLineSegments];
//getting the lerping number evenly spaced
lerpPoint = 1.0d / halfOfLineSegments;
//Setting the first postions at opposite points because both sides must be equal + half the time
pointsToPeriapsis [0] = GetPositionfromDistanceAndAngle (apoapsis, angleOfApoapsis); //Vector2.right is zero deg
pointsToApoapsis [0] = GetPositionfromDistanceAndAngle (periapsis, angleOfApoapsis + 180);
//repeat for each point in half of the array (other half is being done simutaniously
for (int i = 1; i < halfOfLineSegments; i++)
{
//Lerp the distance from apo-peri & vice-versa using "lerpPoint"
float aTOpDistance = Mathf.Lerp (float.Parse (apoapsis.ToString ()), float.Parse (periapsis.ToString ()), float.Parse (lerpPoint.ToString ()) * i);
float pTOaDistance = Mathf.Lerp (float.Parse (periapsis.ToString ()), float.Parse (apoapsis.ToString ()), float.Parse (lerpPoint.ToString ()) * i);
//Lerp through the angles
float aTOpLerpAngle = Mathf.LerpAngle (0, 180, float.Parse (lerpPoint.ToString ()) * i) + angleOfApoapsis;
//If the angle is more than a full circle
if (aTOpLerpAngle >= 360)
{ //Subtract a full circle
aTOpLerpAngle -= 360;
}
//repeat for othe side
float pTOaLerpAngle = Mathf.LerpAngle (180, 360, float.Parse (lerpPoint.ToString ()) * i) + angleOfApoapsis;
if (pTOaLerpAngle >= 360)
{
pTOaLerpAngle -= 360;
if (pTOaLerpAngle >= 360)
{
pTOaLerpAngle -= 360;
}
}
//Calculate the next points
pointsToPeriapsis [i] = GetPositionfromDistanceAndAngle (aTOpDistance, aTOpLerpAngle);
pointsToApoapsis [i] = GetPositionfromDistanceAndAngle (pTOaDistance, pTOaLerpAngle);
}
// Apply everything to the LineRenderer
orbitLine.positionCount = pointsToPeriapsis.Length + pointsToApoapsis.Length;
List allPoints = new List ();
allPoints.AddRange (pointsToPeriapsis);
allPoints.AddRange (pointsToApoapsis);
orbitLine.SetPositions (allPoints.ToArray ());
}
Vector3 GetPositionfromDistanceAndAngle(double distance, float angle)
{
//The Internet donated this, since I didn't pay attention in Trigonometry class
float rad = float.Parse (angle.ToString ()) * Mathf.Deg2Rad;
float x = float.Parse (distance.ToString ()) * Mathf.Cos (rad);
float y = float.Parse (distance.ToString ()) * Mathf.Sin (rad);
return new Vector3 (x + orbiting.transform.position.x, y + orbiting.transform.position.y);
}
If someone can help me fix this and/or if you have any tips to improve. I know I can bring the points in the LineRenderer down, I just added more to see if it helps with my problem. Also, I made the orbit in the picture highly eccentric because the problem is much more noticeable this way.
Thanks guys.
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