CODEWITHSUNDEEP
c#unity-game-enginerotation
Jud McCranie
Jud McCranie

Reputation: 58

C#, Unity, and rotation

I want to emulate a snake slithering randomly. This is in Update() however, the rotation isn't exactly what I want.

My game object's y rotation starts at 270 degrees. At first it seems to work but it always seems to end up pointing approx. 360 degrees.

float currentY = transform.rotation.y;

// the initial y rotation starts at 270
// seems like it rotates y to be between 350 and 10 degrees only.
// This is not what I want. I want it to randomly turn a little to the left or right,
// and then move forward
transform.rotation = Quaternion.Lerp(
    transform.rotation, 
    Quaternion.Euler(0f, (Random.Range(-10.0f, 10.0f) + currentY), 0f), 
    (float)(Time.time * .01)
);


rbody.AddForce(transform.forward * speed * 2.5f);

Upvotes: 0

Views: 209

Answers (2)

Jud McCranie
Jud McCranie

Reputation: 58

Well, she got it yesterday. I think it was that .y was not an angle, as someone said, but I think she realized that herself. Thanks for the help!

Upvotes: 0

Rob
Rob

Reputation: 27357

You're nearly there. The following should work:

float currentY = transform.rotation.y;

// Randomly rotate +- 10 degrees on the y axis
var rotateBy = Random.Range(-10.0f, 10.0f);
transform.rotation = Quaternion.Lerp(
    transform.rotation, 
    Quaternion.Euler(0f, rotateBy, 0f), 
    (float)(Time.time * .01)
);


rbody.AddForce(transform.forward * speed * 2.5f);

Previously, you were asking it to rotate the y axis by y +- 10. What you're really wanting to do is rotate the y axis by +- 10, without adding the current y value.

That is; you were assuming it would rotate to the specified angle, however it's going to rotate by the specified angle.

Upvotes: 3

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