CODEWITHSUNDEEP
unity-game-enginecamerarotation
poshtad
poshtad

Reputation: 25

How to rotate a Unity camera around an object in up-down direction with a degree input

left: slider with values from 0-90, center: desired cam movement from z-axis, right: cam angle towards target on the x-z-Axis

Given a single input angle, I would like to move a camera facing a target object from a top-down position (in the image: 90 degrees) to the bottom plane, along a curve like a sphere surface.

On the left side of the image (1) is a slider in up-down direction, emitting values from 0-90 (degrees). If the slider is at 45 degrees, the camera should move to a diagonal position like in the center of the image (2), if the slider is at 0, it should be at the floor, still facing the target object.

Please note the right part of the image (3), a top-down look at the situation: The camera could be anywhere along the x-z plane. The lines are the x-z angles between different camera positions and the target object. The camera should stay on this line when moving up or down.

I have the transform and position of the cam, the transform and position of the target object, the distance as Vector3 between the 2 positions, and an input angle in degrees from 0-90.

But I don't understand how I would get and use the angle(s) between the cam and the target. I couldn't find a complete example how to approach this, only fragments and so I'm lost between Euler angles, quaternions, transform.rotate, transform.rotation, AngleAxis, LookRotation and many other things Google threw my way to consider, such as arcball cameras.

Could someone give me a step-step example what is the right way to move the camera as described in the image? Something like

void moveCamUpDownToDegree(float degree, Camera cam, Transform centerObjectTransform) {
    Vector 3 newCamPosition;

    //how to calculate the new position?

    cam.transform.position = newCamPosition;
    //last line if needed
    cam.transform.LookAt(centerObjectTransform);
        
}

Thank you for any help.

Upvotes: 0

Views: 1185

Answers (2)

Renan Ruan
Renan Ruan

Reputation: 148

I believed the easiest way to do this would be adding the camera gameobject to a new parent gameobject.

The camera parent object needs to be in the exactly same position as the player, while the camera should be distante, pointing towards the player.

Then when you change the slide, it should change only the rotation of the parent object, so the camera will keep pointing to the player.

You can use the Quaternions to create rotations using Euler Angles. Your code should go like this:

moveCamUpDownToDegree(float degree, GameObject cameraParentGO) 
{ 
    cameraParentGO.transform.rotation = new Quaternion.Euler(0,0,degree);
}

If you also want the camera to follow the player, you can create another script that keeps placing the camera parent object on top of the player position on every update.

Upvotes: 0

AC Studio
AC Studio

Reputation: 146

More like an orbital system or something like a third person, actually it's not as difficult as it might seem, here's an example:

enter image description here

using UnityEngine;

public class Sample : MonoBehaviour
{
    public Transform target; //Purpose of the object
    public Vector2 angle; //Purpose of the object
    public Vector3 offset; //Purpose of the object
    public float distance = 5; //Distance


    private void Update()
    {
        Quaternion rotation = Quaternion.Euler(angle.x,angle.y,0); 
        Vector3 position = rotation * new Vector3(0, 0, -distance) + target.position + offset;

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

}

Upvotes: 2

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