3rd Person Camera Collision

Questions & Answers
1

I've been working with Unity for some while to try to create basic games. Lately, I've been running into a problem. I'm using the script in the 3D Platform Game for my camera and character. I like how it works, but lately, I've been running into a problem with the camera. It's great, but when I run into a hill in the terrain, you can see through it which kinda ruins the effect. I've seen ray casting done on this stuff, but I"m a n00b at this, and the scripts other's supply don't really get that effect I want. Thanks in advance if you can help :D

3

Here's a slightly tidied-up/tested version of Tetrad's C# script - it zooms smoothly back out after you get too close to a wall (the other one stays close to your character after going towards a wall and back). Just need to attach it to a camera (that's parented to the object being moved).

using UnityEngine;
using System.Collections;

public class CameraCollision : MonoBehaviour {

    public float minDistance = 1.0f;
    public float maxDistance = 4.0f;
    public float smooth = 10.0f;

    Vector3 dollyDir;
    float distance; 

    void Awake()
    {
        dollyDir = transform.localPosition.normalized;
        distance = transform.localPosition.magnitude;
    }

    void Update()
    {
            Vector3 desiredCameraPos = transform.parent.TransformPoint( dollyDir * maxDistance );

            RaycastHit hit;
            if( Physics.Linecast( transform.parent.position, desiredCameraPos, out hit ) )
            {
                distance = Mathf.Clamp( hit.distance, minDistance, maxDistance );
            }
            else
            {
                distance=maxDistance;
            }

            transform.localPosition=Vector3.Lerp(transform.localPosition, dollyDir * distance, Time.deltaTime * smooth); 
    }

}
5

or…

	private void compensateForWalls(Vector3 fromObject, ref Vector3 toTarget)
	{
		Debug.DrawLine (fromObject, toTarget, Color.cyan);

		RaycastHit wallHit = new RaycastHit ();
		if(Physics.Linecast(fromObject, toTarget, out wallHit))
		{
			Debug.DrawRay(wallHit.point, wallHit.normal, Color.red);

			Vector3 wallHitVector3 = new Vector3 (wallHit.point.x, wallHit.point.y, wallHit.point.z);

			toTarget = new Vector3 (wallHitVector3.x, toTarget.y, wallHitVector3.z);		
		}
	}
2

This is untested, but should get the point across. I've ripped apart a script that we're using in the game here but with the mouse wheel (or -/= keys) move in/out stuff taken out.

Just make a new class (C#) and drop this in there and attach it to your camera object.

For this script I assume that the hierarchy is something like player base (ground) -> player shoulder-ish -> camera (placed away from the shoulders kind of like a dolly).

public float minDistance = 1.0f;
public float maxDistance = 10.0f;

Vector3 dollyDir;
float distance; 

void Awake()
{
    dollyDir = transform.localPosition.normalized;
    distance = transform.localPosition.magnitude;
}

void Update()
{
        Vector3 desiredCameraPos = transform.parent.TransformPoint( dollyDir * distance );

        // (optional) put layers you don't want to collide with  here (probably things like enemies)
        const int ignoreLayer1 = 1 << 18; 
        const int ignoreLayer2 = 1 << 19;
        int layerMask = ignoreLayer1 | ignorelayer2;
        layerMask = ~layerMask; 

        RaycastHit hit;
        if( Physics.Linecast( transform.parent.position, desiredCameraPos, out hit, layerMask ) )
        {
            distance = Mathf.Clamp( hit.distance, minDistance, maxDistance );
        }

        transform.localPosition = dollyDir * distance;
}
4

hereyou go, a prefab :)

http://blockmonkey.com/my-work/unity-3d-work/