universal turret component

.UniversalTurretComponent.cs.md

Universal turret component

UniversalTurretComponent.cs

// src* https://gist.github.com/andrew-raphael-lukasik/39977c56509eb60a8d44bd94e77cce7a
using UnityEngine;

public class UniversalTurretComponent : MonoBehaviour
{
    public Transform target;
    [SerializeField] Vector2
        degreesPerSecond = new Vector2( 5 , 10 ) ,
        gimbalMin = new Vector2( -40 , -80 ) ,
        gimbalMax = new Vector2( 30 , 80 );

    void FixedUpdate ()
    {
        var parent = transform.parent;
        float deltaTime = Time.fixedDeltaTime;
        Vector3 srcLocalDegrees = transform.localEulerAngles;
        Quaternion targetRotation = Quaternion.LookRotation( ( target.position - transform.position ).normalized , parent.up );
        Vector3 targetLocalDegrees = ( Quaternion.Inverse(parent.rotation) * targetRotation ).eulerAngles;
        Vector3 dstLocalDegrees = new Vector3(
            targetLocalDegrees.x>180
                ? Mathf.Max( targetLocalDegrees.x , 360f+gimbalMin.x )
                : Mathf.Min( targetLocalDegrees.x , gimbalMax.x ) ,
            targetLocalDegrees.y>180
                ? Mathf.Max( targetLocalDegrees.y , 360f+gimbalMin.y )
                : Mathf.Min( targetLocalDegrees.y , gimbalMax.y ) ,
            targetLocalDegrees.z
        );
        transform.localEulerAngles = new Vector3(
            Mathf.MoveTowardsAngle( srcLocalDegrees.x , dstLocalDegrees.x , degreesPerSecond.x * deltaTime ) ,
            Mathf.MoveTowardsAngle( srcLocalDegrees.y , dstLocalDegrees.y , degreesPerSecond.y * deltaTime ) ,
            srcLocalDegrees.z
        );
        
        #if UNITY_EDITOR
        Debug.DrawRay( transform.position , parent.rotation*Quaternion.Euler(targetLocalDegrees)*Vector3.forward , Color.cyan );
        Debug.DrawRay( transform.position , parent.rotation*Quaternion.Euler(dstLocalDegrees)*Vector3.forward , Color.white*0.5f );
        #endif
    }

    #if UNITY_EDITOR
    void OnDrawGizmos ()
    {
        var parent = transform.parent;
        if( parent!=null )
        {
            Vector3 position = transform.position;
            Vector3 forward = transform.forward;
            Vector3 parentRight = parent.right;
            Vector3 parentUp = parent.up;
            Vector3 parentForward = parent.forward;
            
            UnityEditor.Handles.color = Color.red;
            Vector3 xArcDir0 = Quaternion.AngleAxis(gimbalMin.x,parentRight) * parentForward;
            Vector3 xArcDir1 = Quaternion.AngleAxis(gimbalMax.x,parentRight) * parentForward;
            UnityEditor.Handles.DrawWireArc( position , parentRight , xArcDir0 , gimbalMax.x - gimbalMin.x , 1 );
            Gizmos.color = Color.red;
            Gizmos.DrawLine( position , position+xArcDir0 );
            Gizmos.DrawLine( position , position+xArcDir1 );

            UnityEditor.Handles.color = Color.green;
            Vector3 yArcDir0 = Quaternion.AngleAxis(gimbalMin.y,parentUp) * parentForward;
            Vector3 yArcDir1 = Quaternion.AngleAxis(gimbalMax.y,parentUp) * parentForward;
            UnityEditor.Handles.DrawWireArc( position , parentUp , yArcDir0 , gimbalMax.y - gimbalMin.y , 1 );
            Gizmos.color = Color.green;
            Gizmos.DrawLine( position , position+yArcDir0 );
            Gizmos.DrawLine( position , position+yArcDir1 );
            
            Gizmos.color = Color.blue;
            Gizmos.DrawRay( position , parentForward );
            Gizmos.color = Color.white;
            Gizmos.DrawRay( position , forward );
        }
    }
    void OnDrawGizmosSelected ()
    {
        var label = new System.Text.StringBuilder();
        if( transform.parent==null ) label.Append("! NO PARENT TRANSFORM !\n");
        Vector3 localEulerAngles = transform.localEulerAngles;
        label.AppendFormat( System.Globalization.CultureInfo.InvariantCulture , "( {0:0.0} , {1:0.0} , {2:0.0} )" , localEulerAngles.x , localEulerAngles.y , localEulerAngles.z );
        UnityEditor.Handles.Label( transform.position , label.ToString() );
    }
    #endif

}