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Question by fireDude67 · Jul 02, 2010 at 05:12 AM · gameobjectsphereorbit

Make GameObject/Model orbit a sphere

How can I make a GameObject/Model orbit a Sphere?

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avatar image fireDude67 · Jun 23, 2011 at 05:43 PM 0
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wait now i can mark multiple accepted answers??

avatar image Chris D · Jun 23, 2011 at 05:54 PM 0
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@fireDude67 no, this is a byproduct of the switch from the old stack exchange site to the new one as far as I can figure

avatar image cregox · Sep 23, 2011 at 02:28 PM 0
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Agree with @ChrisD after simply testing it. Plus, related link: http://answers.unity3d.com/questions/20525/rotating-camera-around-object-switching-different.html#answer-169165

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Answer by dhendrix · Jul 02, 2010 at 05:34 AM

Use RotateAround. Pass it the transform.position of the object you want to rotate around.

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Answer by StephanK · Jul 02, 2010 at 06:39 AM

You can use either RotateAround as dhendrix mentioned, or you can create an empty GameObject and use this as a pivot for the orbitting GameObject. In Update rotate the pivot around its center and then move your GameObject "distance" along pivot's z-axis.

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Answer by _Petroz · Jul 02, 2010 at 06:14 AM

To do it using physics, you would apply force toward the sphere inside FixedUpdate.

Example:

pseudocode:

FixedUpdate()
{
    Vector3 diff = sphere.transomform.position - object.transform.position;
    Vector3 direction = diff.normalized;
    float gravitationalForce = (sphere.mass * object.mass * gravitationalConstant) / diff.sqrMagnitude;
    object.rigidBody.addForce( direction * gravitationalForce );
}

Gravitation equation taken from: http://www.school-for-champions.com/science/gravitation.htm

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avatar image _Petroz · Jul 08, 2010 at 11:36 PM 0
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added example code

avatar image _Petroz · Jul 12, 2010 at 10:41 AM 0
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yes, rotate around sphere.

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