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    <p>I dont' use unity, but I think this problem isn't unity/c# specific.</p> <p>You can implement it considering that every planet you want to place "depends" from a parent, someway, sun excluded and placed at origin.</p> <p>So said, sun it's located at (0,0,0), Planet1 belongs from sun and it's located at certain radius distance, so it has it's own radius and a rotation angle (always related to its parent). Planet 2 may have sun as parent, so it's a "planet", or from Planet1, becoming its moon. And so on...</p> <p>With this simple scheme, you always have to manage 4 things which can be easly implemented as a class, i.e (not tested, I wrote it here without a compiler, check it from possible syntax errors):</p> <pre><code>public class Planet { public Planet Parent; //if null, I'm the first in chain public float OrbitRadius; //From my parent public float OrbitAngle; //0-360 around my parent public float Radius; //Planet size //EDIT: public Vector3 Position; public void CalculatePosition() { if(Parent == null) this.Position = new Vector(0, 0, 0); this.Position = Parent.Position + OrbitRadius + Math.Sin(OrbitAngle * Math.PI / 180.0f); //Check if it has to be done for each vector component } } </code></pre> <p>More, you can easly implement sun, planets, moons, moons of moons :-)</p> <p>Every time you create a planet, you will assign its parent, randomize class values taking care only of OrbitRadius >> Radius (>> I mean really "really greater", not just "greater")</p> <p>This should also give you a strongest "planet chain" to deal with, maybe with recursive functions.</p> <p>As final step, you can "render" their positions walking all the chain, going to add PlanetX position to parent's position(s) in an incremental manner, dealing only to OrbitAngle; you need some Sin/Cos math here but you will not loose with scale factors.</p> <p>Hope this helps</p> <p><strong>edit</strong>: I added a sort of CalculatePosition, can't verify it now, It's only there to clarify the concept and can be surely improved.</p>
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    1. COI like this solution, I was just thinking random positions, though this gives a natural feel (with the sun and all.) Could even make them move around, which I didn't even think about firstly, but could be very cool. Thanks! You not only gave me a solution, but also some cool new stuff to think about :D
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    2. COI'm glad it helped, have fun with planets ;-)
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