koobas.hobune.stream
Camera Orbit around Planet
I'm creating a game in Unity3D that requires the player to be in control of a planet. I want the camera to move around the planet and rotate in the vector direction of the mouse when the player is holding down the right click anywhere on the screen. I have code written out. However, the player is only able to rotate the camera around the planet if the mouse is on the planet, and throws a "InvalidOperationException: Nullable Object must have a value" error if it is off the planet. How do I change it so that the camera will rotate around the planet even if the mouse is not on the planet? Also, I need the camera to zoom in and out using the scroll on the mouse, and I'm not entirely sure how to do that? Thank you in advance.
public class NewCameraScript : MonoBehaviour {
private Vector3? mouseStartPosition;
private Vector3? currentMousePosition;
[Header("Settings")]
public float planetRadius = 100f;
public float distance;
public float zoomSensitivity;
public float maxZoom;
public float minZoom;
public float slowZoomValue;
public GameObject planet;
void Start()
{
// Cameras initial position
Camera.main.transform.position = new Vector3(planet.transform.position.x, planet.transform.position.y, planet.transform.position.z - distance);
Camera.main.transform.LookAt(planet.transform.position);
}
private void LateUpdate()
{
if (Input.GetMouseButtonDown(1))
mouseStartPosition = GetMouseHit();
if (mouseStartPosition != null)
DragPlanet();
if (Input.GetMouseButtonUp(1))
StaticPlanet();
}
private void DragPlanet()
{
currentMousePosition = GetMouseHit();
RotateCamera((Vector3)mouseStartPosition, (Vector3)currentMousePosition);
}
private void StaticPlanet()
{
mouseStartPosition = null;
currentMousePosition = null;
}
private void Zoom()
{
}
private void RotateCamera(Vector3 dragStartPosition, Vector3 dragEndPosition)
{
//normalised for odd edges
dragEndPosition = dragEndPosition.normalized *planetRadius;
dragStartPosition = dragStartPosition.normalized * planetRadius;
// Cross Product
Vector3 cross = Vector3.Cross(dragEndPosition, dragStartPosition);
// Angle for rotation
float angle = Vector3.SignedAngle(dragEndPosition, dragStartPosition, cross);
//Causes Rotation of angle around the vector from Cross product
Camera.main.transform.RotateAround(planet.transform.position , cross, angle);
}
private static Vector3? GetMouseHit()
{
RaycastHit hit;
if (Physics.Raycast(Camera.main.ScreenPointToRay(Input.mousePosition), out hit))
{
return hit.point;
}
return null;
}
}
do you want to rotate the planet? or do you want to rotate around the planet. I personally would suggest rotate around: https://docs.unity3d.com/ScriptReference/Transform.RotateAround.html you could then run
void Update()
{
if (Input.GetButtonDown("Fire1"))
{
Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
if (Physics.Raycast(ray))
{
...code here to identify if y+/- center and x+/- center and
rotate around by a specific amount based on x and Y
}
}
}
I want the camera to rotate around the planet. thank you but the above code wont work for me as Ive tried it before. Once the camera gets to the north or south poles, if the player tries to rotate the camera left or right, the camera will spin around its axis rather than move in the vector direction right or left.
