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Question by Avoider · Nov 17, 2013 at 08:06 PM · 4.3

Unity 4.3 - 2D - Velocity based on rotation

Hi,

i want to build a space ship game in which you rotate your ship by using the mouse and i want to apply a velocity based on the current rotation of the sprite.

First i set a rotation with the following line of code:

 gameObject.transform.rotation = Quaternion.Euler(0f, 0f, angleInDegrees);

That works well, but now i have no clue how to apply a 'force' to the gameobject in the correct direction.

And i was also wondering why the 'AddForce' method does not work with the rigidbody2D, so i want to change it using 'gameObject.rigidbody2D.velocity'.

Would be nice if you guys could help me out.

thanks Avoider

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Answer by Avoider · Nov 18, 2013 at 05:38 PM

Ok, i have found what is the problem. I used an vector2 as multiplication, but it has to be an vector3.

Here is my code:

 Vector3 velocity = this.transform.rotation * Vector3.up;
 gameObject.rigidbody2D.AddForce(velocity);


Thank you guys Avoider

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