Rotating Character While Terrain Hugging

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By using this post, I have made a driving character, which automatically moves forward and hugs the ground and slopes (matches its rotation). This works, but I also want my character to rotate left and right while riding the ground and slopes (see: Kirby Air Ride). Is that a possibility and how would I accomplish it?

       public Transform backLeft;
       public Transform backRight;
       public Transform frontLeft;
       public Transform frontRight;
       public RaycastHit lr;
       public RaycastHit rr;
       public RaycastHit lf;
       public RaycastHit rf;
       public Vector3 upDir;
       void Update () {
           Physics.Raycast(backLeft.position + Vector3.up, Vector3.down, out lr);
           Physics.Raycast(backRight.position + Vector3.up, Vector3.down, out rr);
           Physics.Raycast(frontLeft.position + Vector3.up, Vector3.down, out lf);
           Physics.Raycast(frontRight.position + Vector3.up, Vector3.down, out rf);
           upDir = (Vector3.Cross(rr.point - Vector3.up, lr.point - Vector3.up) +
                    Vector3.Cross(lr.point - Vector3.up, lf.point - Vector3.up) +
                    Vector3.Cross(lf.point - Vector3.up, rf.point - Vector3.up) +
                    Vector3.Cross(rf.point - Vector3.up, rr.point - Vector3.up)
                   ).normalized;
           Debug.DrawRay(rr.point, Vector3.up);
           Debug.DrawRay(lr.point, Vector3.up);
           Debug.DrawRay(lf.point, Vector3.up);
           Debug.DrawRay(rf.point, Vector3.up);
           transform.up = upDir;
       
       }

Thank you for reading, and please do reply with any help you can give.

Answer 1

Answer by NogeGames · Jul 13, 2016 at 01:16 PM

Ok, so: if I have understood what you want to do it should be pretty easy... Right now your character`s rotation always matches floor , and you want this rotation to be altered when the player is turning right or left. I would just do this:

1) calculate the terrain's perpendicular normal vector; it is your upDir vector which you already have.

2) create a second vector for turning, for example, if this vector is based on an analogic stick you will have a X input value between -1 (totally left) and 1 (totally right). The calculation could be something like:

 float x = "analogicInput";
 float scale = 10f;
 Vector3 inputRotation = new Vector3 (x*scale, 0,0);

3) Add both vector getting a new upVector that depends on the input and terrain. Assign transform.up to this.

Just adding this to your code should be enough (using whatever you want instead of "analogicInput" and whatever scale you want)

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Pixel-Sword · Jul 13, 2016 at 10:52 PM 0

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I tried adding the code, and it is saying that it could not convert string to float. And I do not understand what you mean by adding vectors and assigning them to transform.up, wouldn't that only affect on the vertical rotation?

NogeGames · Jul 14, 2016 at 07:48 AM 0

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"analogicInput" was suposed to be replaced on whatever you want to make your vehicle turn (a numeric variable).

I think it would be great to learn a bit more program$$anonymous$$g (you should know what is a float and what is a string) and some geometrics/algebra, vectors are tricky.

About you not understanding the logic behind adding this vectors is not something I can quickly explain... Your transform.up can do Roll and $$anonymous$$ch rotations (x and z axis rotations) but it cannot make Yaw rotations (y axis): i guess you are trying to add Roll rotations to your terrain based rotations, sooo, you can do it adding your upDir and a new vector.

I think it will still be confusing to you... but try to google all of this if you want to learn D: ... I have studied mathematics and program$$anonymous$$g for years, and it's hard to explain some things in a "short" answer post.

BAE10 · Sep 11, 2016 at 01:48 PM 0

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@Noge-v im trying to do terrain hugging with this exact same script but i need my character to do Yaw rotation (y axis) , how can i do that ?

Answer 2

Answer by Joe0321 · May 17 at 09:04 AM

check this out for solution have solved same problem here : https://answers.unity.com/questions/1215146/rotating-character-while-terrain-hugging.html/[Portal.Arise.com][1]

[1]: https://www.ariseportal.net/

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Rotating Character While Terrain Hugging

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