Version: 2018.4
  • C#


class in UnityEditor


Implemented in:UnityEditor

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Custom 3D GUI controls and drawing in the Scene view.

Handles are the 3D controls that Unity uses to manipulate items in the Scene view. There are a number of built-in Handle GUIs, such as the familiar tools to position, scale and rotate an object via the Transform component. However, it is also possible to define your own Handle GUIs to use with custom component editors. Such GUIs can be a very useful way to edit procedurally-generated Scene content, "invisible" items and groups of related objects, such as waypoints and location markers.

You can also supplement the 3D Handle GUI in the Scene with 2D buttons and other controls overlaid on the Scene view. This is done by enclosing standard Unity GUI calls in a Handles.BeginGUI and Handles.EndGUI pair within the Editor.OnSceneGUI function. You can use HandleUtility.GUIPointToWorldRay and HandleUtility.WorldToGUIPoint to convert coordinates between 2D GUI and 3D world coordinates.

Static Properties

centerColorColor to use for handles that represent the center of something.
colorColors of the handles.
inverseMatrixThe inverse of the matrix for all handle operations.
lightingAre handles lit?
matrixMatrix for all handle operations.
preselectionColorColor to use to highlight an unselected handle currently under the mouse pointer.
secondaryColorSoft color to use for for general things.
selectedColorColor to use for the currently active handle.
xAxisColorColor to use for handles that manipulates the X coordinate of something.
yAxisColorColor to use for handles that manipulates the Y coordinate of something.
zAxisColorColor to use for handles that manipulates the Z coordinate of something.
zTestzTest of the handles.


currentCameraSetup viewport and stuff for a current camera.

Static Methods

ArrowHandleCapDraw an arrow like those used by the move tool.
BeginGUIBegin a 2D GUI block inside the 3D handle GUI.
ButtonMake a 3D Button.
CircleHandleCapDraw a circle handle. Pass this into handle functions.
ClearCameraClears the camera.
ConeHandleCapDraw a cone handle. Pass this into handle functions.
CubeHandleCapDraw a cube handle. Pass this into handle functions.
CylinderHandleCapDraw a cylinder handle. Pass this into handle functions.
DiscMake a 3D disc that can be dragged with the mouse.
DotHandleCapDraw a dot handle. Pass this into handle functions.
DrawAAConvexPolygonDraw anti-aliased convex polygon specified with point array.
DrawAAPolyLineDraw anti-aliased line specified with point array and width.
DrawBezierDraw textured bezier line through start and end points with the given tangents.
DrawCameraDraws a camera inside a rectangle.
DrawDottedLineDraw a dotted line from p1 to p2.
DrawDottedLinesDraw a list of dotted line segments.
DrawGizmosDraw the Gizmos for the given camera.
DrawLineDraw a line from p1 to p2.
DrawLinesDraw a list of line segments.
DrawPolyLineDraw a line going through the list of points.
DrawSelectionFrameDraw a camera facing selection frame.
DrawSolidArcDraw a circular sector (pie piece) in 3D space.
DrawSolidDiscDraw a solid flat disc in 3D space.
DrawSolidRectangleWithOutlineDraw a solid outlined rectangle in 3D space.
DrawWireArcDraw a circular arc in 3D space.
DrawWireCubeDraw a wireframe box with center and size.
DrawWireDiscDraw the outline of a flat disc in 3D space.
EndGUIEnd a 2D GUI block and get back to the 3D handle GUI.
FreeMoveHandleMake an unconstrained movement handle.
FreeRotateHandleMake an unconstrained rotation handle.
GetMainGameViewSizeGet the width and height of the main game view.
LabelMake a text label positioned in 3D space.
MakeBezierPointsRetuns an array of points to representing the bezier curve.
PositionHandleMake a position handle.
RadiusHandleMake a Scene view radius handle.
RectangleHandleCapDraw a rectangle handle. Pass this into handle functions.
RotationHandleMake a Scene view rotation handle.
ScaleHandleMake a Scene view scale handle.
ScaleSliderMake a directional scale slider.
ScaleValueHandleMake a 3D handle that scales a single float.
SetCameraSet the current camera so all Handles and Gizmos are draw with its settings.
SliderMake a 3D slider that moves along one axis.
Slider2DMake a 3D slider that moves along a plane defined by two axes.
SnapValueRounds the value val to the closest multiple of snap (snap can only be positive).
SphereHandleCapDraw a sphere handle. Pass this into handle functions.


CapFunctionThe function to use for drawing the handle e.g. Handles.RectangleCap.
SizeFunctionA delegate type for getting a handle's size based on its current position.