ROOT 6.07/09 Reference Guide |
Generic 3D primitive description class.
See TBuffer3DTypes for producer classes.
The viewers behind the TVirtualViewer3D interface differ greatly in their capabilities e.g.
To cope with these situations the object buffer is filled out in negotiation with the viewer. TBuffer3D classes are conceptually divided into enumerated sections Core, BoundingBox, Raw etc (see TBuffer3D.h for more details).
The SectionsValid() / SetSectionsValid / ClearSectionsValid()
methods of TBuffer3D are used to test/set/clear these section valid flags.
The sections found in TBuffer3D (Core/BoundingBox/Raw Sizes/Raw
) are sufficient to describe any tessellated shape in a generic fashion. An additional ShapeSpecific
section in derived shape specific classes allows a more abstract shape description ("a sphere of inner radius x, outer radius y"). This enables a viewer which knows how to draw (tessellate) the shape itself to do so, which can bring considerable performance and quality benefits, while providing a generic fallback suitable for all viewers.
The rules for client negotiation with the viewer are:
If the viewer requires more sections to be completed (Raw/RawSizes) AddObject() will return flags indicating which ones, otherwise it returns kNone. You must fill the buffer and mark these sections valid, and pass the buffer again. A typical code snippet would be:
ShapeSpecific
: If the viewer can directly display the buffer without filling of the kRaw/kRawSizes section it will not need to request client side tessellation.
Currently we provide the following various shape specific classes, which the OpenGL viewer can take advantage of (see TBuffer3D.h and TBuffer3DTypes.h)
OpenGL only supports solid spheres at present - cut/hollow ones will be requested tessellated.
Anyone is free to add new TBuffer3D classes, but it should be clear that the viewers require updating to be able to take advantage of them. The number of native shapes in OpenGL will be expanded over time.
BoundingBox:
You are not obliged to complete this, as any viewer requiring one internally (OpenGL) will build one for you if you do not provide. However to do this the viewer will force you to provide the raw tessellation, and the resulting box will be axis aligned with the overall scene, which is non-ideal for rotated shapes.
As we need to support orientated (rotated) bounding boxes, TBuffer3D requires the 6 vertices of the box. We also provide a convenience function, SetAABoundingBox(), for simpler case of setting an axis aligned bounding box.
The Core
section of TBuffer3D contains two members relating to reference frames: fLocalFrame
& fLocalMaster
. fLocalFrame
indicates if any positions in the buffer (bounding box and tessellation vertexes) are in local or master (world frame). fLocalMaster
is a standard 4x4 translation matrix (OpenGL column major ordering) for placing the object into the 3D master frame.
If fLocalFrame
is kFALSE, fLocalMaster
should contain an identity matrix. This is set by default, and can be reset using SetLocalMasterIdentity()
function.
Logical & Physical Objects. There are two cases of object addition:
The second case is very typical in geometry packages, GEANT4, where we have very large number repeated placements of relatively few logical (unique) shapes. Some viewers (OpenGL only at present) are able to take advantage of this by identifying unique logical shapes from the fID
logical ID member of TBuffer3D. If repeated addition of the same fID
is found, the shape is cached already - and the costly tessellation does not need to be sent again. The viewer can also perform internal GL specific caching with considerable performance gains in these cases.
For this to work correctly the logical object in must be described in TBuffer3D in the local reference frame, complete with the local/master translation. The viewer indicates this through the interface method
If this returns kTRUE you can make repeated calls to AddObject(), with TBuffer3D containing the same fID, and different fLocalMaster
placements.
For viewers supporting logical/physical objects, the TBuffer3D content refers to the properties of logical object, with the fLocalMaster
transform and the fColor
and fTransparency
attributes, which can be varied for each physical object.
As a minimum requirement all clients must be capable of filling the raw tessellation of the object buffer, in the master reference frame. Conversely viewers must always be capable of displaying the object described by this buffer.
It should be understood that AddObject is not an explicit command to the viewer
In all these cases AddObject() returns kNone, as it does for successful addition, simply indicating it does not require you to provide further information about this object. You should not try to make any assumptions about what the viewer did with it.
This enables the viewer to be connected to a client which sends potentially millions of objects, and only accept those that are of interest at a certain time, caching the relatively small number of CPU/memory costly logical shapes, and retaining/discarding the physical placements as required. The viewer may decide to force the client to rebuild (republish) the scene (via a TPad repaint at present), and thus collect these objects if the internal viewer state changes. It does this presently by forcing a repaint on the attached TPad object - hence the reason for putting all publishing to the viewer in the attached pad objects Paint() method. We will likely remove this requirement in the future, indicating the rebuild request via a normal ROOT signal, which the client can detect.
TVirtualViewer3D provides for two methods of object addition:virtual Int_t AddObject(const TBuffer3D & buffer, Bool_t * addChildren = 0)
If you use the first (simple) case a viewer using logical/physical pairs SetSectionsValid(TBuffer3D::kBoundingBox); will generate IDs for each physical object internally. In the second you can specify a unique identifier from the client, which allows the viewer to be more efficient. It can now cache both logical and physical objects, and only discard physical objects no longer of interest as part of scene rebuilds.
In many geometries there is a rigid containment hierarchy, and so if the viewer is not interested in a certain object due to limits/size then it will also not be interest in any of the contained branch of descendents. Both AddObject() methods have an addChildren parameter. The viewer will complete this (if passed) indicating if children (contained within the one just sent) are worth adding.
Once add AddObject() has been called, the contents are copied to the viewer internally. You are free to destroy this object, or recycle it for the next object if suitable.
Definition at line 19 of file TBuffer3D.h.
Public Types | |
enum | EBoolOpCode { kCSUnion, kCSIntersection, kCSDifference, kCSNoOp } |
enum | ESection { kNone = BIT(0), kCore = BIT(1), kBoundingBox = BIT(2), kShapeSpecific = BIT(3), kRawSizes = BIT(4), kRaw = BIT(5), kAll = kCore|kBoundingBox|kShapeSpecific|kRawSizes|kRaw } |
Public Types inherited from TObject | |
enum | { kIsOnHeap = 0x01000000, kNotDeleted = 0x02000000, kZombie = 0x04000000, kBitMask = 0x00ffffff } |
enum | { kSingleKey = BIT(0), kOverwrite = BIT(1), kWriteDelete = BIT(2) } |
enum | EStatusBits { kCanDelete = BIT(0), kMustCleanup = BIT(3), kObjInCanvas = BIT(3), kIsReferenced = BIT(4), kHasUUID = BIT(5), kCannotPick = BIT(6), kNoContextMenu = BIT(8), kInvalidObject = BIT(13) } |
Public Member Functions | |
TBuffer3D (Int_t type, UInt_t reqPnts=0, UInt_t reqPntsCapacity=0, UInt_t reqSegs=0, UInt_t reqSegsCapacity=0, UInt_t reqPols=0, UInt_t reqPolsCapacity=0) | |
Destructor. More... | |
virtual | ~TBuffer3D () |
Destructor. More... | |
void | ClearSectionsValid () |
Clear any sections marked valid. More... | |
UInt_t | GetSections (UInt_t mask) const |
UInt_t | NbPnts () const |
UInt_t | NbPols () const |
UInt_t | NbSegs () const |
Bool_t | SectionsValid (UInt_t mask) const |
void | SetAABoundingBox (const Double_t origin[3], const Double_t halfLengths[3]) |
Set fBBVertex in kBoundingBox section to a axis aligned (local) BB using supplied origin and box half lengths. More... | |
void | SetLocalMasterIdentity () |
Set kRaw tessellation section of buffer with supplied sizes. More... | |
Bool_t | SetRawSizes (UInt_t reqPnts, UInt_t reqPntsCapacity, UInt_t reqSegs, UInt_t reqSegsCapacity, UInt_t reqPols, UInt_t reqPolsCapacity) |
Set kRaw tessellation section of buffer with supplied sizes. More... | |
void | SetSectionsValid (UInt_t mask) |
Int_t | Type () const |
Public Member Functions inherited from TObject | |
TObject () | |
TObject constructor. More... | |
TObject (const TObject &object) | |
TObject copy ctor. More... | |
virtual | ~TObject () |
TObject destructor. More... | |
void | AbstractMethod (const char *method) const |
Use this method to implement an "abstract" method that you don't want to leave purely abstract. More... | |
virtual void | AppendPad (Option_t *option="") |
Append graphics object to current pad. More... | |
virtual void | Browse (TBrowser *b) |
Browse object. May be overridden for another default action. More... | |
virtual const char * | ClassName () const |
Returns name of class to which the object belongs. More... | |
virtual void | Clear (Option_t *="") |
virtual TObject * | Clone (const char *newname="") const |
Make a clone of an object using the Streamer facility. More... | |
virtual Int_t | Compare (const TObject *obj) const |
Compare abstract method. More... | |
virtual void | Copy (TObject &object) const |
Copy this to obj. More... | |
virtual void | Delete (Option_t *option="") |
Delete this object. More... | |
virtual Int_t | DistancetoPrimitive (Int_t px, Int_t py) |
Computes distance from point (px,py) to the object. More... | |
virtual void | Draw (Option_t *option="") |
Default Draw method for all objects. More... | |
virtual void | DrawClass () const |
Draw class inheritance tree of the class to which this object belongs. More... | |
virtual TObject * | DrawClone (Option_t *option="") const |
Draw a clone of this object in the current pad. More... | |
virtual void | Dump () const |
Dump contents of object on stdout. More... | |
virtual void | Error (const char *method, const char *msgfmt,...) const |
Issue error message. More... | |
virtual void | Execute (const char *method, const char *params, Int_t *error=0) |
Execute method on this object with the given parameter string, e.g. More... | |
virtual void | Execute (TMethod *method, TObjArray *params, Int_t *error=0) |
Execute method on this object with parameters stored in the TObjArray. More... | |
virtual void | ExecuteEvent (Int_t event, Int_t px, Int_t py) |
Execute action corresponding to an event at (px,py). More... | |
virtual void | Fatal (const char *method, const char *msgfmt,...) const |
Issue fatal error message. More... | |
virtual TObject * | FindObject (const char *name) const |
Must be redefined in derived classes. More... | |
virtual TObject * | FindObject (const TObject *obj) const |
Must be redefined in derived classes. More... | |
virtual Option_t * | GetDrawOption () const |
Get option used by the graphics system to draw this object. More... | |
virtual const char * | GetIconName () const |
Returns mime type name of object. More... | |
virtual const char * | GetName () const |
Returns name of object. More... | |
virtual char * | GetObjectInfo (Int_t px, Int_t py) const |
Returns string containing info about the object at position (px,py). More... | |
virtual Option_t * | GetOption () const |
virtual const char * | GetTitle () const |
Returns title of object. More... | |
virtual UInt_t | GetUniqueID () const |
Return the unique object id. More... | |
virtual Bool_t | HandleTimer (TTimer *timer) |
Execute action in response of a timer timing out. More... | |
virtual ULong_t | Hash () const |
Return hash value for this object. More... | |
virtual void | Info (const char *method, const char *msgfmt,...) const |
Issue info message. More... | |
virtual Bool_t | InheritsFrom (const char *classname) const |
Returns kTRUE if object inherits from class "classname". More... | |
virtual Bool_t | InheritsFrom (const TClass *cl) const |
Returns kTRUE if object inherits from TClass cl. More... | |
virtual void | Inspect () const |
Dump contents of this object in a graphics canvas. More... | |
void | InvertBit (UInt_t f) |
virtual Bool_t | IsEqual (const TObject *obj) const |
Default equal comparison (objects are equal if they have the same address in memory). More... | |
virtual Bool_t | IsFolder () const |
Returns kTRUE in case object contains browsable objects (like containers or lists of other objects). More... | |
Bool_t | IsOnHeap () const |
virtual Bool_t | IsSortable () const |
Bool_t | IsZombie () const |
virtual void | ls (Option_t *option="") const |
The ls function lists the contents of a class on stdout. More... | |
void | MayNotUse (const char *method) const |
Use this method to signal that a method (defined in a base class) may not be called in a derived class (in principle against good design since a child class should not provide less functionality than its parent, however, sometimes it is necessary). More... | |
virtual Bool_t | Notify () |
This method must be overridden to handle object notification. More... | |
void | Obsolete (const char *method, const char *asOfVers, const char *removedFromVers) const |
Use this method to declare a method obsolete. More... | |
void | operator delete (void *ptr) |
Operator delete. More... | |
void | operator delete[] (void *ptr) |
Operator delete []. More... | |
void * | operator new (size_t sz) |
void * | operator new (size_t sz, void *vp) |
void * | operator new[] (size_t sz) |
void * | operator new[] (size_t sz, void *vp) |
TObject & | operator= (const TObject &rhs) |
TObject assignment operator. More... | |
virtual void | Paint (Option_t *option="") |
This method must be overridden if a class wants to paint itself. More... | |
virtual void | Pop () |
Pop on object drawn in a pad to the top of the display list. More... | |
virtual void | Print (Option_t *option="") const |
This method must be overridden when a class wants to print itself. More... | |
virtual Int_t | Read (const char *name) |
Read contents of object with specified name from the current directory. More... | |
virtual void | RecursiveRemove (TObject *obj) |
Recursively remove this object from a list. More... | |
void | ResetBit (UInt_t f) |
virtual void | SaveAs (const char *filename="", Option_t *option="") const |
Save this object in the file specified by filename. More... | |
virtual void | SavePrimitive (std::ostream &out, Option_t *option="") |
Save a primitive as a C++ statement(s) on output stream "out". More... | |
void | SetBit (UInt_t f, Bool_t set) |
Set or unset the user status bits as specified in f. More... | |
void | SetBit (UInt_t f) |
virtual void | SetDrawOption (Option_t *option="") |
Set drawing option for object. More... | |
virtual void | SetUniqueID (UInt_t uid) |
Set the unique object id. More... | |
virtual void | SysError (const char *method, const char *msgfmt,...) const |
Issue system error message. More... | |
Bool_t | TestBit (UInt_t f) const |
Int_t | TestBits (UInt_t f) const |
virtual void | UseCurrentStyle () |
Set current style settings in this object This function is called when either TCanvas::UseCurrentStyle or TROOT::ForceStyle have been invoked. More... | |
virtual void | Warning (const char *method, const char *msgfmt,...) const |
Issue warning message. More... | |
virtual Int_t | Write (const char *name=0, Int_t option=0, Int_t bufsize=0) |
Write this object to the current directory. More... | |
virtual Int_t | Write (const char *name=0, Int_t option=0, Int_t bufsize=0) const |
Write this object to the current directory. More... | |
Static Public Member Functions | |
static UInt_t | DecCSLevel () |
Decrement CS level. More... | |
static UInt_t | GetCSLevel () |
Return CS level. More... | |
static void | IncCSLevel () |
Increment CS level. More... | |
Static Public Member Functions inherited from TObject | |
static Long_t | GetDtorOnly () |
Return destructor only flag. More... | |
static Bool_t | GetObjectStat () |
Get status of object stat flag. More... | |
static void | SetDtorOnly (void *obj) |
Set destructor only flag. More... | |
static void | SetObjectStat (Bool_t stat) |
Turn on/off tracking of objects in the TObjectTable. More... | |
Public Attributes | |
Double_t | fBBVertex [8][3] |
Int_t | fColor |
TObject * | fID |
Bool_t | fLocalFrame |
Double_t | fLocalMaster [16] |
UInt_t | fPhysicalID |
Double_t * | fPnts |
Int_t * | fPols |
Bool_t | fReflection |
Int_t * | fSegs |
Short_t | fTransparency |
Private Member Functions | |
TBuffer3D (const TBuffer3D &) | |
void | Init () |
Initialise buffer. More... | |
const TBuffer3D & | operator= (const TBuffer3D &) |
Private Attributes | |
UInt_t | fNbPnts |
UInt_t | fNbPols |
UInt_t | fNbSegs |
UInt_t | fPntsCapacity |
UInt_t | fPolsCapacity |
UInt_t | fSections |
UInt_t | fSegsCapacity |
const Int_t | fType |
Static Private Attributes | |
static UInt_t | fgCSLevel = 0 |
Additional Inherited Members | |
Protected Member Functions inherited from TObject | |
virtual void | DoError (int level, const char *location, const char *fmt, va_list va) const |
Interface to ErrorHandler (protected). More... | |
void | MakeZombie () |
#include <TBuffer3D.h>
Enumerator | |
---|---|
kCSUnion | |
kCSIntersection | |
kCSDifference | |
kCSNoOp |
Definition at line 45 of file TBuffer3D.h.
enum TBuffer3D::ESection |
Enumerator | |
---|---|
kNone | |
kCore | |
kBoundingBox | |
kShapeSpecific | |
kRawSizes | |
kRaw | |
kAll |
Definition at line 51 of file TBuffer3D.h.
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private |
TBuffer3D::TBuffer3D | ( | Int_t | type, |
UInt_t | reqPnts = 0 , |
||
UInt_t | reqPntsCapacity = 0 , |
||
UInt_t | reqSegs = 0 , |
||
UInt_t | reqSegsCapacity = 0 , |
||
UInt_t | reqPols = 0 , |
||
UInt_t | reqPolsCapacity = 0 |
||
) |
Destructor.
Construct from supplied shape type and raw sizes
Definition at line 222 of file TBuffer3D.cxx.
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virtual |
Destructor.
Definition at line 235 of file TBuffer3D.cxx.
void TBuffer3D::ClearSectionsValid | ( | ) |
Clear any sections marked valid.
Definition at line 286 of file TBuffer3D.cxx.
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static |
Decrement CS level.
Definition at line 512 of file TBuffer3D.cxx.
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static |
Return CS level.
Definition at line 496 of file TBuffer3D.cxx.
Definition at line 70 of file TBuffer3D.h.
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static |
Increment CS level.
Definition at line 504 of file TBuffer3D.cxx.
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private |
Initialise buffer.
Definition at line 245 of file TBuffer3D.cxx.
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inline |
Definition at line 82 of file TBuffer3D.h.
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inline |
Definition at line 84 of file TBuffer3D.h.
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inline |
Definition at line 83 of file TBuffer3D.h.
Definition at line 69 of file TBuffer3D.h.
Set fBBVertex in kBoundingBox section to a axis aligned (local) BB using supplied origin and box half lengths.
Definition at line 320 of file TBuffer3D.cxx.
void TBuffer3D::SetLocalMasterIdentity | ( | ) |
Set kRaw tessellation section of buffer with supplied sizes.
Set fLocalMaster in section kCore to identity
Definition at line 296 of file TBuffer3D.cxx.
Bool_t TBuffer3D::SetRawSizes | ( | UInt_t | reqPnts, |
UInt_t | reqPntsCapacity, | ||
UInt_t | reqSegs, | ||
UInt_t | reqSegsCapacity, | ||
UInt_t | reqPols, | ||
UInt_t | reqPolsCapacity | ||
) |
Set kRaw tessellation section of buffer with supplied sizes.
Definition at line 359 of file TBuffer3D.cxx.
Definition at line 67 of file TBuffer3D.h.
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inline |
Definition at line 87 of file TBuffer3D.h.
Double_t TBuffer3D::fBBVertex[8][3] |
Definition at line 109 of file TBuffer3D.h.
Int_t TBuffer3D::fColor |
Definition at line 90 of file TBuffer3D.h.
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staticprivate |
Definition at line 41 of file TBuffer3D.h.
TObject* TBuffer3D::fID |
Definition at line 89 of file TBuffer3D.h.
Bool_t TBuffer3D::fLocalFrame |
Definition at line 92 of file TBuffer3D.h.
Double_t TBuffer3D::fLocalMaster[16] |
Definition at line 94 of file TBuffer3D.h.
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private |
Definition at line 24 of file TBuffer3D.h.
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private |
Definition at line 26 of file TBuffer3D.h.
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private |
Definition at line 25 of file TBuffer3D.h.
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mutable |
Definition at line 120 of file TBuffer3D.h.
Double_t* TBuffer3D::fPnts |
Definition at line 114 of file TBuffer3D.h.
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private |
Definition at line 28 of file TBuffer3D.h.
Int_t* TBuffer3D::fPols |
Definition at line 116 of file TBuffer3D.h.
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private |
Definition at line 30 of file TBuffer3D.h.
Bool_t TBuffer3D::fReflection |
Definition at line 93 of file TBuffer3D.h.
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private |
Definition at line 32 of file TBuffer3D.h.
Int_t* TBuffer3D::fSegs |
Definition at line 115 of file TBuffer3D.h.
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private |
Definition at line 29 of file TBuffer3D.h.
Short_t TBuffer3D::fTransparency |
Definition at line 91 of file TBuffer3D.h.
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private |
Definition at line 22 of file TBuffer3D.h.