Vector Math: Velocity based Rotation

[InfamousSabre]

I'm currently trying to get a model to face the direction it is moving.

I've tried this:

Obj.Rotation = Quaternion.RotationMatrix(Matrix.LookAtRH(Vector3.Zero, Obj.Velocity, Vector3.WorldUp)).ToRotation();

But it isn't working quite right. Probably because the Matrix given is not a Rotation Matrix.
Anyone know how to do this?

Edited June 23, 2014 by InfamousSabre

[InfamousSabre]

I'm not sure what you are asking for

I have an object moving through the air, and I want to rotate it to face the direction its moving.

[Jitnaught]

I'm not sure what you are asking for but you can try this

if (!Exists(obj)) {    myObject = World.CreateObject("your model", (Player.Character.Position + Player.Character.Direction));    if (Exists(obj)) {        myObject.AttachToPed(Player.Character, Bone.YourBone, new Vector3(0.2, 0.02, 0.07), new Vector3(0, Helper.DegreeToRadian(49), 0));    }}

You can try adjust the offset at each Vector 3 section

What is this? He's trying to get the model to face the direction it is moving, not attach an object to the player.

[InfamousSabre]

Annnnd heres the answer!

Obj.RotationQuaternion = Quaternion.Invert(GenerateRotationFromDirectionVector(Vector3.Normalize(Obj.Velocity)));

public Quaternion GenerateRotationFromDirectionVector(Vector3 vDirection) //Use Vector3.Normalize(Obj.Velocity) as your Vector3 parameter!    {        // Step 1. Setup basis vectors describing the rotation given the input vector and assuming an initial up direction of (0, 1, 0)        Vector3 vUp = new Vector3(0, 1.0f, 0);           // Y Up vector        Vector3 vRight = Vector3.Cross(vUp, vDirection);    // The perpendicular vector to Up and Direction        vUp = Vector3.Cross(vDirection, vRight);            // The actual up vector given the direction and the right vector        // Step 2. Put the three vectors into the matrix to bulid a basis rotation matrix        // This step isnt necessary, but im adding it because often you would want to convert from matricies to quaternions instead of vectors to quaternions        // If you want to skip this step, you can use the vector values directly in the quaternion setup below        Matrix mBasis = new Matrix();                mBasis.M11 = vRight.X; mBasis.M12 = vRight.Y; mBasis.M13 = vRight.Z; mBasis.M14 = 0.0f;        mBasis.M21 = vUp.X; mBasis.M22 = vUp.Y; mBasis.M23 = vUp.Z; mBasis.M24 = 0.0f;        mBasis.M31 = vDirection.X; mBasis.M32 = vDirection.Y; mBasis.M33 = vDirection.Z; mBasis.M34 = 0.0f;        mBasis.M41 = 0.0f; mBasis.M42 = 0.0f; mBasis.M43 = 0.0f; mBasis.M44 = 1.0f;         // Step 3. Build a quaternion from the matrix        Quaternion qrot = new Quaternion();        qrot.W = (float)Math.Sqrt(1.0f + mBasis.M11 + mBasis.M22 + mBasis.M33) / 2.0f;        double dfWScale = qrot.W * 4.0;        qrot.X = (float)((mBasis.M32 - mBasis.M23) / dfWScale);        qrot.Y = (float)((mBasis.M13 - mBasis.M31) / dfWScale);        qrot.Z = (float)((mBasis.M21 - mBasis.M12) / dfWScale);        return qrot;    }

Edited June 23, 2014 by InfamousSabre

[Silent]

Calling it solved then. If it needs to be reopened, PM me.