Handles.DrawSolidDisc
static function DrawSolidDisc(center: Vector3, normal: Vector3, radius: float): void;
static void DrawSolidDisc(Vector3 center, Vector3 normal, float radius);
static def DrawSolidDisc(center as Vector3, normal as Vector3, radius as float) as void
Parameters

center The center of the dics.
normal The normal of the disc.
radius The radius of the dics

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

Draw a solid flat disc in 3D space.


Solid Disc in the Scene View.
	// Create a semi transparent white disc with a ScaleValueHandle attached to the disc
	// that lets you modify the "areaOfEffect" var in the WireDiscExample.js
	
	@CustomEditor (SolidDiscExample)
	class DrawSolidDisc extends Editor {
	    function OnSceneGUI () {
	    	Handles.color = Color(1,0,0,0.1);
	        Handles.DrawSolidDisc(target.transform.position, Vector3.up, target.areaOfEffect);
	        Handles.color = Color.red;
	        target.areaOfEffect = 
			Handles.ScaleValueHandle(target.areaOfEffect,
        					target.transform.position + Vector3(target.areaOfEffect,0,0),
        					Quaternion.identity,
        					2,
        					Handles.CylinderCap,
        					2);
	    }
	}
And the script attached to this Handle:
	//SolidDiscExample.js
	
	var areaOfEffect : float = 5;