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 a GameObject 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 GameObjects, 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. Do this by enclosing standard Unity GUI calls in a Handles.BeginGUI / EndGUI pair within the //OnSceneGUI// function. Use HandleUtility.GUIPointToWorldRay and HandleUtility.WorldToGUIPoint to convert coordinates between 2D GUI and 3D world coordinates.
| centerColor | Color to use for handles that represent the center of something. |
| color | Look up or set the Color of the handles. |
| inverseMatrix | The inverse of the matrix for all handle operations. |
| lighting | Are handles lit? |
| matrix | Matrix for all handle operations. |
| secondaryColor | Soft color to use for for less interactive UI, or handles that are used rarely (or not at all). |
| selectedColor | Color to use for the currently active handle. |
| xAxisColor | Color to use for handles that manipulate the X coordinate of something. |
| yAxisColor | Color to use for handles that manipulates the Y coordinate of something. |
| zAxisColor | Color to use for handles that manipulates the Z coordinate of something. |
| currentCamera | Setup viewport and stuff for a current camera. |
| ArrowCap | Draw an arrow like those used by the move tool. |
| BeginGUI | Begin a 2D GUI block inside the 3D handle GUI. |
| Button | Make a 3D button. |
| CircleCap | Draw a camera-facing Circle. Pass this into handle functions. |
| ClearCamera | Clears the camera. |
| ConeCap | Draw a Cone. Pass this into handle functions. |
| CubeCap | Draw a cube. Pass this into handle functions. |
| CylinderCap | Draw a Cylinder. Pass this into handle functions. |
| Disc | Make a 3D disc that can be dragged with the mouse. |
| DotCap | Draw a camera-facing dot. Pass this into handle functions. |
| DrawAAConvexPolygon | Draw anti-aliased convex polygon specified with point array. |
| DrawAAPolyLine | Draw anti-aliased line specified with point array and width. |
| DrawBezier | Draw textured bezier line through start and end points with the given tangents. |
| DrawCamera | Draws a camera inside a rectangle. |
| DrawDottedLine | Draw a dotted line from p1 to p2. |
| DrawDottedLines | Draw a list of dotted line segments. |
| DrawLine | Draw a line from p1 to p2. |
| DrawLines | Draw a list of line segments. |
| DrawPolyLine | Draw a line going through the list of all points. |
| DrawSolidArc | Draw a circular sector (pie piece) in 3D space. |
| DrawSolidDisc | Draw a solid flat disc in 3D space. |
| DrawSolidRectangleWithOutline | Draw a solid outlined rectangle in 3D space. |
| DrawWireArc | Draw a circular arc in 3D space. |
| DrawWireDisc | Draw the outline of a flat disc in 3D space. |
| EndGUI | End a 2D GUI block and get back to the 3D handle GUI. |
| FreeMoveHandle | Make an unconstrained movement handle. |
| FreeRotateHandle | Make an unconstrained rotation handle. |
| GetMainGameViewSize | Get the width and height of the main Game view. |
| Label | Make a text label positioned in 3D space. |
| MakeBezierPoints | Retuns an array of points to representing the bezier curve. See Handles.DrawBezier. |
| PositionHandle | Make a 3D Scene view position handle. |
| RadiusHandle | Make a Scene view radius handle. |
| RotationHandle | Make a Scene view rotation handle. |
| ScaleHandle | Make a Scene view scale handle. |
| ScaleSlider | Make a directional scale slider. |
| ScaleValueHandle | Make a single-float draggable handle. |
| SelectionFrame | Draw a camera facing selection frame. |
| SetCamera | Set the current camera so all Handles and Gizmos are draw with its settings. |
| Slider | Make a 3D slider. |
| Slider2D | Slide a handle in a 2D plane. |
| SnapValue | Rounds the value val to the closest multiple of snap (snap can only be positive). |
| SphereCap | Draw a Sphere. Pass this into handle functions. |
| DrawCapFunction | The function to use for drawing the handle e.g. Handles.RectangleCap. |