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Question by DEADmetal · Mar 19, 2014 at 12:02 PM · rotationaxisrotation axis

C# - Rotation around object axis

Hello, i need a script to detect objects rotation in respect to its own axis, not the worlds axis.

In more detail - i'm creating flight control system for my spaceship. I need my script to detect it's rotational motion, and as soon as that happens, make it fire thrusters to counter that rotational motion.

My script:

if (Spaceship.rigidbody.angularVelocity.z > 0){ rigidbody.AddForce (-transform.up * 500); }

My problem:

If Spaceship faces another diection of z axis, the script gives a "reversed" result. Instead of stopping the rotation, the thruster accelerates it.

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avatar image thornekey · Mar 19, 2014 at 01:04 PM 0
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so you want

 space.self
 

?

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Answer by Fattie · Mar 19, 2014 at 01:23 PM

generally you add Torque, not Force, to make something spin.

check out the doco...

AddRelativeTorque Adds a torque to the rigidbody relative to the rigidbodie's own coordinate system.

AddTorque Adds a torque to the rigidbody.

http://docs.unity3d.com/Documentation/ScriptReference/Rigidbody.html

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avatar image DEADmetal · Mar 19, 2014 at 03:21 PM 0
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In this example, i need force - not to make my spaceship spin on its own, but be spinned by the thruster ins$$anonymous$$d. AddForce part is ok.

The problem lies in that i need the script to detect the spin direction in respect to spaceship axis (left to right wing) and not the world axis.

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Answer by DEADmetal · Mar 19, 2014 at 02:14 PM

Could you please incorporate that in my code example? I have no idea where that should go. And the answer to your question is probably - yes.

I need the script to detect the spin of a Spaceship object in respect to its own axis (left to right wing), and not the world axis.

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