Question

使用unity3d让一个简单的3d模型在鼠标的控制下360度旋转展示

请大神给出具体语句，谢谢

Answer 1

public class xunzhuan : MonoBehaviour {

public Transform target;
private int MouseWheelSensitivity = 1;
private int MouseZoomMin = 1;
private int MouseZoomMax = 5;
private float normalDistance = 3;

private Vector3 normalized;

private float xSpeed = 250.0f;
private float ySpeed = 120.0f;

private int yMinLimit = -20;
private int yMaxLimit = 80;

private float x = 0.0f;
private float y = 0.0f;

private Vector3 screenPoint;
private Vector3 offset;

private Quaternion rotation = Quaternion.Euler(new Vector3(30f, 0f, 0f));
private Vector3 CameraTarget;
void Start ( )
{

CameraTarget = target.position;

//float z = target.transform.position.z - 3.95f;
float z = target.transform.position.z - normalDistance;

transform.position = rotation * new Vector3(transform.position.x, transform.position.y, z);
//transform.position = rotation * new Vector3(transform.position.x, transform.position.y, target.transform.position.z - 3.95f);

transform.LookAt(target);

var angles = transform.eulerAngles;
x = angles.y;
y = angles.x;
}

void Update ( )
{

if (Input.GetMouseButton(1))
{
x += Input.GetAxis("Mouse X") * xSpeed * 0.02f;
y -= Input.GetAxis("Mouse Y") * ySpeed * 0.02f;
x += Input.GetAxis("Mouse X") * xSpeed * 0.02f;
y -= Input.GetAxis("Mouse Y") * ySpeed * 0.02f;

y = ClampAngle(y, yMinLimit, yMaxLimit);

var rotation = Quaternion.Euler(y, x, 0);
var position = rotation * new Vector3(0.0f, 0.0f, -normalDistance) + CameraTarget;

transform.rotation = rotation;
transform.position = position;

}
else if (Input.GetAxis("Mouse ScrollWheel") != 0)
{
normalized = (transform.position - CameraTarget).normalized;

if (normalDistance >= MouseZoomMin && normalDistance <= MouseZoomMax)
{
normalDistance -= Input.GetAxis("Mouse ScrollWheel") * MouseWheelSensitivity;
}
if (normalDistance < MouseZoomMin)
{
normalDistance = MouseZoomMin;
}
if (normalDistance > MouseZoomMax)
{
normalDistance = MouseZoomMax;
}
transform.position = normalized * normalDistance;

}
else if (Input.GetMouseButtonDown(2))
{
screenPoint = Camera.main.WorldToScreenPoint(target.transform.position);
offset = target.transform.position - Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenPoint.z));
}

if (Input.GetMouseButton(2))
{
Vector3 curScreenPoint = new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenPoint.z);

Vector3 curPosition = Camera.main.ScreenToWorldPoint(curScreenPoint) + offset;
target.transform.position = curPosition;
}
transform.LookAt(CameraTarget);

}

static float ClampAngle ( float angle, float min, float max )
{
if (angle < -360)
angle += 360;
if (angle > 360)
angle -= 360;
return Mathf.Clamp(angle, min, max);
}

}
把这个脚本挂到相机上，在把要看到物体拖到target上，你看看吧！