Empty Prefab (objects that can be spawned): Assets → Create → Prefab
WORKFLOW: 3D GRAPHICS IMPORT
Blender: http://unity3d.com/support/documentation/Manual/HOWTO-ImportObjectBlender.html
Input Manager: Edit → Project Settings → Input
PS4: https://www.reddit.com/r/Unity3D/comments/1syswe/ps4_controller_map_for_unity/
Colliders: make Box Collider slight larger to avoid tunneling.
Component → Physics → RigidBody
Update() - depends on framerate FixedUpdate() for physics behaviour LateUpdate() - happens after Update()
Game Object → Create Other → Particle System
Ellipsoid = size Rnd Velocity = randomness
Start Update FixedUpdate // fixed rate - for forces etc
Non-private methods are exposed to Inspector
Debug.Log('planet distance: ' + dist);
Gizmos for visual debugging: https://docs.unity3d.com/ScriptReference/Gizmos.html