OpenGL rendering and utility classes.

The GL module incapsulates ROOT's interface to the OpenGL rendering engine and provides the following functionality:

management of system-resources;
frequently used utility classes;
base-classes for shapes, scenes and viewers;
concrete implementations of shapes needed by TGeo package;
concrete implementations of scenes and viewers including the GUI components;
specialized plot-painters for GL rendering of TH2, TH3, TF2 and TF3 object as well as parametric surfaces.

Papers describing OpenGL in ROOT:

ROOT 3D graphics, presented at CHEP 2006.
3D graphics with OpenGL: recent improvements and plans, presented at ROOT Workshop 2007
Next generation of OpenGL support in ROOT, presented at CHEP 2007.

Collaboration diagram for OpenGL rendering:

Classes
class	TArcBall
	Implements the arc-ball rotation manipulator. More...

class	TF2GL
	GL renderer for TF2. More...

class	TGL5DDataSet

class	TGL5DDataSetEditor
	GUI editor for OpenGL 5D Painter. More...

class	TGL5DPainter
	TGL5DPainter implements "gl5d" option for TTree::Draw. More...

class	TGLAdapter
	Allow plot-painters to be used for gl-inpad and gl-viewer. More...

class	TGLAnnotation
	GL-overlay annotation. More...

class	TGLAutoRotator
	Automatically rotates GL camera. More...

class	TGLAxis
	GL Axis. More...

class	TGLAxisPainterBox
	Utility class to paint axis in GL. More...

class	TGLBoundingBox
	Concrete class describing an orientated (free) or axis aligned box of 8 vertices. More...

class	TGLBoxPainter
	Paints TH3 histograms by rendering variable-sized boxes matching the bin contents. More...

class	TGLCamera
	Abstract base camera class - concrete classes for orthographic and perspective cameras derive from it. More...

class	TGLCameraGuide
	Draws arrows showing camera orientation in the overlay. More...

class	TGLCameraOverlay
	A GL overlay element which displays camera furstum. More...

class	TGLClip
	Abstract clipping shape - derives from TGLPhysicalShape Adds clip mode (inside/outside) and pure virtual method to approximate shape as set of planes. More...

class	TGLClipPlane
	Concrete clip plane object. More...

class	TGLClipBox
	Concrete clip box object. More...

class	TGLClipSet
	A collection of concrete TGLClip objects to be selected from. More...

class	TGLClipSetSubEditor
	GUI sub-editor for TGLClipSet. More...

class	TGLClipSetEditor
	GUI editor for TGLClipSet. More...

class	TGLContext
	This class encapsulates window-system specific information about a GL-context and alows their proper management in ROOT. More...

class	TGLContextIdentity
	Identifier of a shared GL-context. More...

class	TGLCylinder
	Implements a native ROOT-GL cylinder that can be rendered at different levels of detail. More...

class	TGLEmbeddedViewer
	Minimal GL-viewer that can be embedded in a standard ROOT frames. More...

class	TGLEventHandler
	Base-class and default implementation of event-handler for TGLViewer. More...

class	TGLFaceSet
	Implements a native ROOT-GL representation of an arbitrary set of polygons. More...

class	TGLFBO
	Frame-buffer object. More...

class	TGLFont
	A wrapper class for FTFont. More...

class	TGLFontManager
	A FreeType GL font manager. More...

class	TGLFormat
	Encapsulation of format / contents of an OpenGL buffer. More...

class	TGLH2PolyPainter
	Paint TH2Poly. More...

class	TGLHistPainter
	The histogram painter class using OpenGL. More...

class	TGLLegoPainter
	Plot-painter implementing LEGO rendering of TH2 histograms in cartesian, polar, cylindrical and spherical coordinates. More...

class	TGLLightSet
	Encapsulates a set of lights for OpenGL. More...

class	TGLLightSetSubEditor
	Sub-editor for TGLLightSet. More...

class	TGLLockable
	Simple locking interface used by viewer and scene. More...

class	TGLLogicalShape
	Abstract logical shape - a GL 'drawable' - base for all shapes - faceset sphere etc. More...

class	TGLManip
	Abstract base class for viewer manipulators, which allow direct in viewer manipulation of a (TGlPhysicalShape) object - currently translation, scaling and rotation along/round objects local axes. More...

class	TGLManipSet
	Combine all available manipulators in a collection. More...

class	TGLObject
	Base-class for direct OpenGL renderers. More...

class	TGLOrthoCamera
	Orthographic projection camera. More...

class	TGLOutput
	Wrapper class for GL capture & output routines. More...

class	TGLOverlayElement
	An overlay element. More...

class	TGLOverlayList
	Manage a collection of overlay elements. More...

class	TGLOverlayButton
	GL-overlay button. More...

class	TGLPadPainter
	"Delegating" part of TGLPadPainter. More...

class	TGLParametricEquation
	A parametric surface is a surface defined by a parametric equation, involving two parameters (u, v): More...

class	TGLParametricPlot

class	TGLParametricEquationGL
	GL-renderer wrapper for TGLParametricEquation. More...

class	TGLPerspectiveCamera
	Perspective projection camera - with characteristic foreshortening. More...

class	TGLPhysicalShape
	Concrete physical shape - a GL drawable. More...

class	TGLPlot3D
	Description of TGLPlot3D. More...

class	TGLPlotBox
	Implementation of a box around a histogram/function for plot-painters. More...

class	TGLPlotCamera
	Camera for TGLPlotPainter and sub-classes. More...

class	TGLPlotPainter
	Base class for plot-painters that provide GL rendering of various 2D and 3D histograms, functions and parametric surfaces. More...

class	TGLPlotCoordinates
	Helper class for plot-painters holding information about axis ranges, numbers of bins and flags if certain axis is logarithmic. More...

class	TGLBoxCut
	Used by plot-painters to determine the area of the plot that is cut away. More...

class	TGLTH3Slice
	A slice of a TH3. More...

class	TGLPolyLine
	To draw a 3D polyline in a GL window. More...

class	TGLPShapeObj
	Wrap TGLPysicalShape into TObject so that it can be edited using GED. More...

class	TGLPShapeObjEditor
	GUI editor for TGLPShapeObj. More...

class	TGLPShapeRef
	Base class for references to TGLPysicalShape that need to be notified when the shape is destroyed. More...

class	TGLQuadric
	Wrapper class for GLU quadric shape drawing object. More...

class	TGLRnrCtx
	The TGLRnrCtx class aggregates data for a given redering context as needed by various parts of the ROOT's OpenGL infrastructure. More...

class	TGLRotateManip
	Rotate manipulator - attaches to physical shape and draws local axes widgets - rings drawn from attached physical center, in plane defined by axis. More...

class	TGLSAFrame
	Standalone GL Viewer GUI main frame. More...

class	TGLSAViewer
	The top level standalone GL-viewer - created via plugin manager. More...

class	TGLScaleManip
	Scale manipulator - attaches to physical shape and draws local axes widgets with box heads. More...

class	TGLScene
	TGLScene provides management and rendering of ROOT's default 3D /object representation as logical and physical shapes. More...

class	TGLSceneBase
	Scene base-class – provides basic interface expected by the TGLViewer or its sub-classes: More...

class	TGLSceneInfo
	Base class for extended scene context. More...

class	TGLScenePad
	Implements VirtualViewer3D interface and fills the base-class visualization structures from pad contents. More...

class	TGLSelectBuffer
	Encapsulates OpenGL select buffer. More...

class	TGLSelectRecord
	Standard selection record including information about containing scene and details ob out selected object (TGLPhysicalShape, TObject or simply a void* for foreign scenes). More...

class	TGLOvlSelectRecord
	Selection record for overlay objects. More...

class	TGLSphere
	Implements a native ROOT-GL sphere that can be rendered at different levels of detail. More...

class	TGLStopwatch
	Stopwatch object for timing GL work. More...

class	TGLSurfacePainter
	Implements painting of TH2 with "SURF" option. More...

class	TGLText
	GL Text. More...

class	TGLTF3Painter
	Plot-painter for TF3 functions. More...

class	TGLIsoPainter
	"gliso" option for TH3. More...

class	TGLTH3Composition

class	TGLTH3CompositionPainter

class	TGLTransManip
	Translation manipulator - attaches to physical shape and draws local axes widgets with arrow heads. More...

class	TGLVertex3
	3 component (x/y/z) vertex class. More...

class	TGLVector3
	3 component (x/y/z) vector class. More...

class	TGLLine3
	3D space, fixed length, line class, with direction / length 'vector', passing through point 'vertex'. More...

class	TGLRect
	Viewport (pixel base) 2D rectangle class. More...

class	TGLPlane
	3D plane class - of format Ax + By + Cz + D = 0 More...

class	TGLMatrix
	16 component (4x4) transform matrix - column MAJOR as per GL. More...

class	TGLColor
	Class encapsulating color information in preferred GL format - an array of four unsigned bytes. More...

class	TGLColorSet
	Class encapsulating a set of colors used throughout standard rendering. More...

class	TGLUtil
	Wrapper class for various misc static functions - error checking, draw helpers etc. More...

class	TGLSelectionBuffer

class	TGLViewer
	Base GL viewer object - used by both standalone and embedded (in pad) GL. More...

class	TGLViewerBase
	Base class for GL viewers. More...

class	TGLViewerEditor
	GUI editor for TGLViewer. More...

class	TGLWidget
	GL window with context. More...

class	TH2GL
	Rendering of TH2 and derived classes. More...

class	TH3GL
	OpenGL renderer class for TH3. More...

class	TPointSet3DGL
	Direct OpenGL renderer for TPointSet3D. More...

class	TX11GLManager
	The TX11GLManager is X11 implementation of TGLManager. More...

Classes