koobas.hobune.stream
How to have an object be plotted with an angle and altitude around an object
I have made a simple script to test the feasibility of this idea, but it doesnt work. #pragma strict var originX = 0; var originY = 0; var altitude = 100; var angle = 45; var relativeX = 0; var relativeY = 0; function Start () {
}
function Update () {
if (angle < 90 && angle > 1)
{
relativeX = Mathf.Sin(angle) * altitude;
relativeY = Mathf.Cos(angle) * altitude;
transform.position = Vector3(relativeX + originX,0,relativeY + originY);
}
else
{
angle = 0;
}
angle = angle + 0;
}
I realize this wont work with angles outside 1 through 90, this was just a test, hence the check
the script will plot the object around the other, but it appears that every angle increment it adds 60°, and will somehow happily go above 90°, and well above 360°. the object also randomly disappears which i assume has something to do with bad scripting.
I not clear what you are trying to do here. It looks like you want to plot a circular path around originX and originY. I don't see any code actually incrementing 'angle,' so I cannot figure out what is going wrong with that code. $$anonymous$$aybe a diagram and possibly more of your code would help.
i was wanting to plot an object with an angle and altitude around another object to create an "orbit" I realized I have been using degrees while mathf.sin() uses radians, but my ship is still disappearing randomly
First as for your code above, you have the Sin() and Cos() reversed for your polar to rectangular conversion. Here is your script with a few changes. Start with an empty scene and attach it to a cube:
var speed = 0.001;
var originX = 0.0;
var originY = 0.0;
var altitude = 4.0;
var angle : float = 0.0;
function Update () {
var relativeX = Mathf.Cos(angle) * altitude;
var relativeY = Mathf.Sin(angle) * altitude;;
angle = (angle + speed * Time.deltaTime) % (2.0 * Mathf.PI);
transform.position = Vector3(relativeX + originX,0,relativeY + originY);
}
Note that the are significantly easier ways to orbit object in Unity. One is to use Transform.RotateAround().
Another way:
Place an empty game object at the center of rotation.
Place your object to orbit in orbit at the right altitude.
Make the object in orbit a child of the empty game object by dragging and dropping it on the empty game object.
Rotate the empty game object with a simple script. Just call this each frame:
transform.Rotate(Vector3(0,10 * Time.deltaTime, 0);
Thank you so much! what does the "Time.deltaTime) % (2.0 * $$anonymous$$athf.PI)" do? does that make higher orbits slower than lower ones?
This code just increments the angle. By using using Time.deltaTime this way, I make the rotation independent of the frame rate, so that the rotation will happen at the same speed no matter what platform you run it on. The "% (2.0 $$anonymous$$athf.PI)" is probably not necessary. Angle is measured in radians which from 0 to 2 PI. This code just makes sure the angle is always in this range. It would almost certainly work without that code.
