Handles.DrawBezier

Parameters

Description

Draw textured bezier line through start and end points with the given tangents. To get an anti-aliased effect use a texture that is 1x2 pixels with one transparent white pixel and one opaque white pixel. The bezier curve will be swept using this texture.

Note: Use HandleUtility.GetHandleSize where you might want to have constant screen-sized handles.


Bezier Line in the Scene View.

// Draws a red bezier curve from (0,0,0) to the transform's position

@CustomEditor (BezierScript)
class DrawBezierHandle extends Editor {

    function OnSceneGUI() {
        var width : float = HandleUtility.GetHandleSize(Vector3.zero) * 0.1;
        Handles.DrawBezier(target.transform.position,
                    Vector3.zero,
                    Vector3.up,
                    -Vector3.up,
                    Color.red,
                    null,
                    width);
    }
}

using UnityEngine;
using UnityEditor;

[CustomEditor(typeof(BezierExample))]
public class DrawBezierExample : Editor
{
    private void OnSceneViewGUI(SceneView sv)
    {
        BezierExample be = target as BezierExample;

        be.startPoint = Handles.PositionHandle(be.startPoint, Quaternion.identity);
        be.endPoint = Handles.PositionHandle(be.endPoint, Quaternion.identity);
        be.startTangent = Handles.PositionHandle(be.startTangent, Quaternion.identity);
        be.endTangent = Handles.PositionHandle(be.endTangent, Quaternion.identity);

        Handles.DrawBezier(be.startPoint, be.endPoint, be.startTangent, be.endTangent, Color.red, null, 2f);
    }

    void OnEnable()
    {
        Debug.Log("OnEnable");
        SceneView.onSceneGUIDelegate += OnSceneViewGUI;
    }

    void OnDisable()
    {
        Debug.Log("OnDisable");
        SceneView.onSceneGUIDelegate -= OnSceneViewGUI;
    }
}

And the script attached to this Handle:

//BezierScript.js

Debug.Log("I have a bezier curve handle attached!");

using UnityEngine;

public class BezierExample : MonoBehaviour
{
    public Vector3 startPoint = new Vector3(-0.0f, 0.0f, 0.0f);
    public Vector3 endPoint = new Vector3(-2.0f, 2.0f, 0.0f);
    public Vector3 startTangent = Vector3.zero;
    public Vector3 endTangent = Vector3.zero;
}