Unity3D script 3 (rotation)

1. The rotation of the object

Give the object a rotation angle.

1. Quaternion quadruple (x, y, z, w)

transfrom.rotation()=... is inconvenient to operate, and it is not recommended to use it officially

2. Euler Angle

transfrom.eulerAngles = new Vector(0,45,0);

transfrom.LocalE ulerAngles = new Vector(0,45,0);

void Start(){
    transfrom.localEulerAngles = new Vector(0,45,0);
}

This will rotate the object 45 degrees.

Modify the angle in Update and continue to rotate

Vector3 angles = transfrom.localEulerAngles;

anlges.y +=0.5f;

transfrom.localEulerAngles = angles;

Optimized to rotate at a constant speed

float rotateSpeed = 30;

void Update(){
    Vector3 angle = transfrom.localEulerAngles;
    angle.y +=0.5f;
    transfrom.localEulerAngles = angle;
}

Uniform rotation:

void Update(){
    float rotateSpeed = 30;
    Vector3 angle = transfrom.localEulerAngles;
    angle.y +=rotateSpeed * Time.deltaTime;
    transfrom.localEulerAngles = angle;
}

2. Relative rotation

Rotate(): Rotate a relative angle

transfrom.Rotate(dx,dy,dz,space)

void Update(){
    float rotateSpeed = 30;
    float speed = rotateSpeed * Time.deltaTime;
    this.transfrom.Rotate(0,speed,0,Space.Self);
}

3. Rotation and revolution

Rotation: rotating around its own axis

Revolution: revolve around another object

When the parent object rotates, the child object rotates with it.

Example: A satellite orbits the earth

viod Update(){
    float rotateSpeed = 60;
    float speed = rotateSpeed * Time.deltaTime;
    Transfrom parent = this.transfrom.parent;
    parent.Rotate(0,speed,0,Space.Self);
}

Find the parent object of the object that needs to be revolved, and let the parent object rotate.

Make the earth rotate around the y-axis of the earth, set the initial position of the earth to 0 (same as the position of the earth-moon system), and the satellite revolves around the object a1, so that the rotation of a1 can drive the satellite to rotate. Since the rotation points around which the earth and the satellite revolve are different, their angular velocities can be adjusted separately.

4. Official documents

unity.cn

-manual

-Script API

Unity User Manual 2021.3 (LTS) - Unity Manual

Unity also has an English document when it is installed

Address: Uhub\2021.3.18f1c1\Editor\Data\Documentation\en