Handles.Disc

static function Disc (rotation : Quaternion, position : Vector3, axis : Vector3, size : float, cutoffPlane : boolean, snap : float) : Quaternion

Parameters

Name	Description
rotation	the rotation of the disc
position	the center of the disc
axis	the axis to rotate around
size	the size of the disc in world space See Also:HandleUtility.GetHandleSize
cutoffPlane	if true, only the front-facing half of the circle is draw / draggable. This is useful when you have many overlapping rotation axes (like in the default rotate tool) to avoid clutter.
snap	the new value after the user has modified it. Note: Use HandleUtility.GetHandleSize where you might want to have constant screen-sized handles.

Description

Make a 3D disc that can be dragged with the mouse

Disc Handle on the Scene View.

// Create a handle to rotate an object over 45 degrees on X and Y axis

@CustomEditor (DiscValueModifier)
class DiscHandle extends Editor {
function OnSceneGUI () {
target.rot =
Handles.Disc(target.rot,
target.transform.position,
Vector3(1,1,0),
5,
false,
1);

if (GUI.changed)
EditorUtility.SetDirty (target);
}
}

And the script attached to this Handle:

// Usage: Place this script on the Game Object you want to modify
// the handle's rot with the disc

@script ExecuteInEditMode()

var rot : Quaternion = Quaternion.identity;

function Update() {
transform.rotation = rot;
}