IGActiveFreeAttrByID

(grap_gen.c:379)

Prototype:

void IGActiveFreeAttrByID(IPObjectStruct *PObj, IPAttrIDType AttrID)

Description:

Free attribute ID AttrID from PObj in all object's hierarchy.

Parameters:

PObj:	Objects to remove Named attribute from.
AttrID:	ID of attribute to remove.

Returned Value:

void

Keywords:

IGActiveFreePolyIsoAttribute

(grap_gen.c:321)

Prototype:

void IGActiveFreePolyIsoAttribute(IPObjectStruct *PObj, int FreePolygons, int FreeIsolines, int FreeSketches, int FreeCtlMesh)

Description:

Free attribute named Name from all objects in PObj object's hierarchy.

Parameters:

PObj:	Object to remove Named attribute from.
FreePolygons:	f TRUE free all polygonal approximations of freeforms.
FreeIsolines:	f TRUE free all isocurve approximations of freeforms.
FreeSketches:	f TRUE free all sketching strokes of freeforms.
FreeCtlMesh:	If TRUE free all control meshes of freeforms.

Returned Value:

void

Keywords:

IGActiveListFreeAttrByID

(grap_gen.c:290)

Prototype:

void IGActiveListFreeAttrByID(IPObjectStruct *PObjs, IPAttrIDType AttrID)

Description:

Free attribute named Name from all objects in PObjs object's hierarchy.

Parameters:

PObjs:	Objects to remove Named attribute from.
AttrID:	ID of attribute to remove.

Returned Value:

void

Keywords:

IGActiveListFreePolyIsoAttribute

(grap_gen.c:265)

Prototype:

void IGActiveListFreePolyIsoAttribute(IPObjectStruct *PObjs, int FreePolygons, int FreeIsolines, int FreeSketches, int FreeCtlMesh)

Description:

Free attribute named Name from all objects in PObjs object's hierarchy and linked list.

Parameters:

PObjs:	Objects to remove Named attribute from.
FreePolygons:	f TRUE free all polygonal approximations of freeforms.
FreeIsolines:	f TRUE free all isocurve approximations of freeforms.
FreeSketches:	f TRUE free all sketching strokes of freeforms.
FreeCtlMesh:	If TRUE free all control meshes of freeforms.

Returned Value:

void

Keywords:

IGClearObjTextureMovieAttr

(grap_gen.c:1602)

Prototype:

void IGClearObjTextureMovieAttr(const IPObjectStruct *PObj)

Description:

Clears all texture/movie attributes, if any from PObj.

Parameters:

PObj:	Object to free all texture/movie attributes.

Returned Value:

void

See Also:

IGInitSrfTexture IGInitSrfMovie

Keywords:

IGCnvrtChar2Raster

(draw_str.c:271)

Prototype:

unsigned char *IGCnvrtChar2Raster(const char c)

Description:

Converts a given text, using a fixed raster font, to a form suitable for drawing in a raster display. In Open GL this can amount to:

    glColor3d(r, g, b);
    glRasterPos2d(x, y);
    glBitmap(8, 8, 0, 0, 10, 0, IGCnvrtChar2Raster('x'));


Parameters:


 c:    Character to convert.



Returned Value:


  unsigned char *:  The bit map rasterized



See Also:

  IGDrawString


Keywords:



 IGConfirmConvexPolys 
  (grap_gen.c:91)

Prototype:

  void IGConfirmConvexPolys(IPObjectStruct *PObj, int Depth)


Description:

Make sure all polygons are convex.

Parameters:

PObj:	Objects to make sure all its polygons are convex.
Depth:	Of object hierarchy.

Returned Value:

void

Keywords:

IGDSetDrawPolyFunc

(drawpoly.c:33)

Prototype:

IGDrawObjectFuncType IGDSetDrawPolyFunc(IGDrawObjectFuncType DrawPolyFunc)

Description:

Sets the polygon drawing call back kroutine.

Parameters:

DrawPolyFunc:	New poly drawing routine or NULL to disable.

Returned Value:

IGDrawObjectFuncType: Old poly drawing routine.

Keywords:

IGDecomposeMdlDue2Graphics

(draw_mdl.c:742)

Prototype:

IPObjectStruct *IGDecomposeMdlDue2Graphics(const IPObjectStruct *PMdls)

Description:

Checks if the Model can be rendered as a monolithic objects or needs to split into trimmed surfaces (as each trimmed surface has different graphics attributes).

Parameters:

PMdls:	To check, and possibly decompose.

Returned Value:

IPObjectStruct *: NULL, if can be rendered as a monolithic object, or a list of trimmed surface object if required splitting.

See Also:

IGDecomposeVMdlDue2Graphics

Keywords:

IGDecomposeVMdlDue2Graphics

(drawvmdl.c:734)

Prototype:

IPObjectStruct *IGDecomposeVMdlDue2Graphics(const IPObjectStruct *PVMdls)

Description:

Checks if the VModel can be rendered as a monolithic objects or needs to split into trimmed surfaces (as each trimmed surface has different graphics attributes).

Parameters:

PVMdls:	To check, and possibly decompose.

Returned Value:

IPObjectStruct *: NULL, if can be rendered as a monolithic object, or a list of trimmed surface object if required splitting.

See Also:

IGDecomposeMdlDue2Graphics

Keywords:

IGDefaultProcessEvent

(grap_gen.c:1644)

Prototype:

int IGDefaultProcessEvent(IGGraphicEventType Event, IrtRType *ChangeFactor)

Description:

Processes the given event. Returns TRUE if redraw of view window is needed.

Parameters:

Event:	Event to process.
ChangeFactor:	A continuous scale between -1 and 1 to quantify the change to apply according to the event type. For composed operation contains both X and Y information.

Returned Value:

int: TRUE if refresh is needed.

See Also:

IGHandleContinuousMotion

Keywords:

IGDefaultStateHandler

(grap_gen.c:1771)

Prototype:

int IGDefaultStateHandler(int State, int StateStatus, int Refresh)

Description:

Handle the event of a pop up window. This is the default handler which can be invoked by other specific handlers for event they do not care about.

Parameters:

State:	State event type to handle.
StateStatus:	G_STATE_OFF, IG_STATE_ON, IG_STATE_TGL for turning off, on or toggling current value. IG_STATE_DEC and IG_STATE_INC serves as dec./inc. factors.
Refresh:	Not used.

Returned Value:

int: TRUE if needs to refresh.

Keywords:

IGDeleteTexture

(grap_gen.c:1440)

Prototype:

int IGDeleteTexture(const IPObjectStruct *PObj)

Description:

Deletes the texture mapping function of an object.

Parameters:

PObj:	Object to delete texture from. Attributes might be affected.

Returned Value:

int: TRUE if was texture, FALSE otherwise.

Keywords:

IGDrawCurve

(draw_crv.c:36)

Prototype:

void IGDrawCurve(IPObjectStruct *PObj)

Description:

Draw a single Curve object using current modes and transformations. Curve must be with either E3 or P3 point type and must be a NURB curve. Piecewise linear approximation is cashed under "_isoline" and "_ctlpoly" attributes of PObj.

Parameters:

PObj:	A curve object to draw.

Returned Value:

void

Keywords:

IGDrawCurveGenPolylines

(draw_crv.c:101)

Prototype:

void IGDrawCurveGenPolylines(const IPObjectStruct *PObj)

Description:

Generates the polyline approximation of the curve on the fly if needed and display it.

Parameters:

PObj:	A curve(s) object. Its attributes are likely to be affected.

Returned Value:

void

Keywords:

IGDrawModel

(draw_mdl.c:52)

Prototype:

void IGDrawModel(IPObjectStruct *PObj, IGDrawObjectFuncType DrawTSrfsFuncPtr)

Description:

Draw a single model object using current modes and transformations. Piecewise linear approximation is cashed under "_isoline" and "_ctlmesh" attributes of PObj. Polygonal approximation is saved under "_polygons".

Parameters:

PObj:	A model object to draw.
DrawTSrfsFuncPtr:	Optional pointer to a function that will draw the trimmed surfaces, if model is decomposed into trimmed surfaces.

Returned Value:

void

Keywords:

IGDrawModelGenPolygons

(draw_mdl.c:168)

Prototype:

void IGDrawModelGenPolygons(const IPObjectStruct *PObj)

Description:

Generates the polygonal approximation of the model on the fly if needed and display it.

Parameters:

PObj:	A model(s) object.

Returned Value:

void

Keywords:

IGDrawPolyBoundary

(grap_gen.c:797)

Prototype:

void IGDrawPolyBoundary(IPObjectStruct *PObj)

Description:

Draw the boundary edges of a polygonal object.

Parameters:

PObj:	A polygonal object.

Returned Value:

void

Keywords:

IGDrawPolyContours

(grap_gen.c:862)

Prototype:

void IGDrawPolyContours(IPObjectStruct *PObj)

Description:

Draw XY parallel contours to the given model.

Parameters:

PObj:	A polygonal object.

Returned Value:

void

Keywords:

IGDrawPolyContoursSetup

(grap_gen.c:835)

Prototype:

int IGDrawPolyContoursSetup(IrtRType x, IrtRType y, IrtRType z, int n)

Description:

Setup information for contouring.

Parameters:

x, y, z:	Direction of contouring.
n:	Number of desired contours.

Returned Value:

int: Old number of contours.

Keywords:

IGDrawPolyDiscontinuities

(grap_gen.c:1078)

Prototype:

void IGDrawPolyDiscontinuities(IPObjectStruct *PObj)

Description:

Draw the discont edges of an object, if any. PObj can have a "DiscontAngle" attribute with the dihedral angle to consider discontinuous (in degrees).

Parameters:

PObj:	A polyline object.

Returned Value:

void

Keywords:

IGDrawPolyIsophotes

(grap_gen.c:999)

Prototype:

void IGDrawPolyIsophotes(IPObjectStruct *PObj)

Description:

Draw Isophotes from the Z direction to the given model.

Parameters:

PObj:	A polygonal object.

Returned Value:

void

Keywords:

IGDrawPolyIsophotesSetup

(grap_gen.c:972)

Prototype:

int IGDrawPolyIsophotesSetup(IrtRType x, IrtRType y, IrtRType z, int n)

Description:

Setup information for isophotes' drawings.

Parameters:

x, y, z:	Direction of isophotes' view.
n:	Number of desired isophotes.

Returned Value:

int: Old number of isophotes.

Keywords:

IGDrawPolyKnotLines

(grap_gen.c:1120)

Prototype:

void IGDrawPolyKnotLines(IPObjectStruct *PObj)

Description:

Draw the knot lines of an object, if any.

Parameters:

PObj:	A polyline object.

Returned Value:

void

Keywords:

IGDrawPolySilhBndry

(grap_gen.c:736)

Prototype:

void IGDrawPolySilhBndry(IPObjectStruct *PObj)

Description:

Draw the boundary and silhouette edges of a polygonal object.

Parameters:

PObj:	A polygonal object.

Returned Value:

void

Keywords:

IGDrawPolySilhouette

(grap_gen.c:755)

Prototype:

void IGDrawPolySilhouette(IPObjectStruct *PObj)

Description:

Draw the silhouette edges of a polygonal object.

Parameters:

PObj:	A polygonal object.

Returned Value:

void

Keywords:

IGDrawPolygonSketches

(grap_gen.c:660)

Prototype:

void IGDrawPolygonSketches(IPObjectStruct *PObj)

Description:

Generates a sketch like drawing of the surface on the fly if needed and display it.

Parameters:

PObj:	A surface(s) object.

Returned Value:

void

Keywords:

IGDrawString

(draw_str.c:165)

Prototype:

void IGDrawString(IPObjectStruct *PObj)

Description:

Draw a single string object using current modes and transformations.

Parameters:

PObj:	A string object to draw.

Returned Value:

void

See Also:

IGCnvrtChar2Raster

Keywords:

IGDrawSurface

(draw_srf.c:56)

Prototype:

void IGDrawSurface(IPObjectStruct *PObj)

Description:

Draw a single surface object using current modes and transformations. Piecewise linear approximation is cashed under "_Isoline??Res" and "_ctlmesh" attributes of PObj. Polygonal approximation is saved under "_Polygons??Res".

Parameters:

PObj:	A surface object to draw.

Returned Value:

void

Keywords:

IGDrawSurfaceGenPolygons

(draw_srf.c:186)

Prototype:

void IGDrawSurfaceGenPolygons(const IPObjectStruct *PObj)

Description:

Generates the polygonal approximation of the surface on the fly if needed and display it.

Parameters:

PObj:	A surface(s) object. Note its attributes might be affected.

Returned Value:

void

Keywords:

IGDrawTriangGenSrfPolygons

(drawtris.c:126)

Prototype:

void IGDrawTriangGenSrfPolygons(const IPObjectStruct *PObj)

Description:

Generates the polygonal approximation of the triangular surface on the fly if needed and display it.

Parameters:

PObj:	A triangular surface(s) object.

Returned Value:

void

Keywords:

IGDrawTriangSrf

(drawtris.c:46)

Prototype:

void IGDrawTriangSrf(IPObjectStruct *PObj)

Description:

Draw a single triangular surface object using current modes and transformations. Piecewise linear approximation is cashed under "_isoline" and "_ctlmesh" attributes of PObj. Polygonal approximation is saved under "_polygons".

Parameters:

PObj:	A triangular surface object to draw.

Returned Value:

void

Keywords:

IGDrawTrimSrf

(drawtsrf.c:51)

Prototype:

void IGDrawTrimSrf(IPObjectStruct *PObj)

Description:

Draw a single trimmed surface object using current modes and transformations. Piecewise linear approximation is cashed under "_isoline" and "_ctlmesh" attributes of PObj. Polygonal approximation is saved under "_polygons".

Parameters:

PObj:	A trimmed surface object to draw.

Returned Value:

void

Keywords:

IGDrawTrimSrfGenPolygons

(drawtsrf.c:150)

Prototype:

void IGDrawTrimSrfGenPolygons(const IPObjectStruct *PObj)

Description:

Generates the polygonal approximation of the trimmed surface on the fly if needed and display it.

Parameters:

PObj:	A trimmed surface(s) object.

Returned Value:

void

Keywords:

IGDrawTrivar

(drawtriv.c:47)

Prototype:

void IGDrawTrivar(IPObjectStruct *PObj)

Description:

Draw a single trivariate function object using current modes and transformations. Piecewise linear approximation is cashed under "_isoline" and "_ctlmesh" attributes of PObj. Polygonal approximation is saved under "_polygons".

Parameters:

PObj:	A trivariate function object to draw.

Returned Value:

void

Keywords:

IGDrawTrivarGenSrfPolygons

(drawtriv.c:147)

Prototype:

void IGDrawTrivarGenSrfPolygons(const IPObjectStruct *PObj)

Description:

Generates the polygonal approximation of the trivariate on the fly if needed and display it.

Parameters:

PObj:	A trivariate(s) object.

Returned Value:

void

Keywords:

IGDrawVModel

(drawvmdl.c:53)

Prototype:

void IGDrawVModel(IPObjectStruct *PObj, IGDrawObjectFuncType DrawTSrfsFuncPtr)

Description:

Draw a single model object using current modes and transformations. Piecewise linear approximation is cashed under "_isoline" and "_ctlmesh" attributes of PObj. Polygonal approximation is saved under "_polygons".

Parameters:

PObj:	A model object to draw.
DrawTSrfsFuncPtr:	Optional pointer to a function that will draw the trimmed surfaces, if model is decomposed into trimmed surfaces.

Returned Value:

void

Keywords:

IGDrawVModelGenPolygons

(drawvmdl.c:168)

Prototype:

void IGDrawVModelGenPolygons(const IPObjectStruct *PObj)

Description:

Generates the polygonal approximation of the model on the fly if needed and display it.

Parameters:

PObj:	A model(s) object.

Returned Value:

void

Keywords:

IGFindMinimalDist

(grap_gen.c:500)

Prototype:

IrtRType IGFindMinimalDist(IPObjectStruct *PObj, IPPolygonStruct **MinPl, IrtPtType MinPt, int *MinPlIsPolyline, const IrtPtType LinePos, const IrtVecType LineDir, IrtRType *HitDepth)

Description:

Finds the minimal distance in PObj to the line defined by LinePos and LineDir.

Parameters:

PObj:	List of objects to search for a minimal distance.
MinPl:	Poly with the minimal distance in PObj.
MinPt:	Closest point on the picked object.
MinPlIsPolyline:	TRUE if MinPl is a polyline, FALSE if a polygon.
LinePos:	A point on the line to test against.
LineDir:	The direction of the line.
HitDepth:	In case of zero distance (the ray hits a polygon, update the closest depth.

Returned Value:

IrtRType: The minimal distance found to the line.

Keywords:

IGGenPolygonSketches

(grap_gen.c:694)

Prototype:

IPObjectStruct *IGGenPolygonSketches(IPObjectStruct *PObj, IrtRType FineNess)

Description:

Generates a sketch like drawing for the given object with the prescribed fineness.

Parameters:

PObj:	A surface(s) object.
FineNess:	Relative fineness to approximate PObj with.

Returned Value:

IPObjectStruct *: The sketch data.

Keywords:

IGGetObjIsoLines

(grap_gen.c:1150)

Prototype:

IPObjectStruct *IGGetObjIsoLines(const IPObjectStruct *PObj)

Description:

Get the proper isoparametric curve approximation of the object.

Parameters:

PObj:	To get the iso curves' approximation

Returned Value:

IPObjectStruct *: The iso curve's approximation.

Keywords:

IGGetObjPolygons

(grap_gen.c:1181)

Prototype:

IPObjectStruct *IGGetObjPolygons(const IPObjectStruct *PObj)

Description:

Get the proper polygonal approximation of the object.

Parameters:

PObj:	To get the polygonal approximation

Returned Value:

IPObjectStruct *: The polygonal approximation.

Keywords:

IGGraphicsStateGet

(grap_gen.c:2428)

Prototype:

void IGGraphicsStateGet(IGGraphicStateStruct *IGS)

Description:

Get the Irit graphics state.

Parameters:

IGS:	Graphics state to fetch.

Returned Value:

void

See Also:

IritGraphStateStruct IGGraphicsStateReset IGGraphicsStateGet

Keywords:

IGGraphicsStateReset

(grap_gen.c:2470)

Prototype:

void IGGraphicsStateReset(IGGraphicStateStruct *IGS)

Description:

Initializes the Irit graphics state

Parameters:

IGS:	Graphics state to initialize.

Returned Value:

void

See Also:

IritGraphStateStruct IGGraphicsStateGet IGGraphicsStateSet

Keywords:

IGGraphicsStateResetDefault

(grap_gen.c:2449)

Prototype:

void IGGraphicsStateResetDefault(void)

Description:

Reste the default global graphics state.

Parameters:

None

Returned Value:

void

See Also:

Keywords:

IGGraphicsStateSet

(grap_gen.c:2407)

Prototype:

void IGGraphicsStateSet(const IGGraphicStateStruct *IGS)

Description:

Set an Irit graphics state.

Parameters:

IGS:	Graphics state to set.

Returned Value:

void

See Also:

IritGraphStateStruct IGGraphicsStateReset IGGraphicsStateGet

Keywords:

IGInitSrfMovie

(grap_gen.c:1479)

Prototype:

int IGInitSrfMovie(const IPObjectStruct *PObj)

Description:

Reads in a texture mapping movie if object has "pmovie" attribute and set up the texture movie for further processing.

Parameters:

PObj:	Object to extract its texture mapping movie if has one.

Returned Value:

int: TRUE if object has texture mapping movie, FALSE otherwise.

See Also:

IGInitSrfTexture IGClearObjTextureMovieAttr

Keywords:

IGInitSrfTexture

(grap_gen.c:1217)

Prototype:

int IGInitSrfTexture(const IPObjectStruct *PObj)

Description:

Reads in a texture mapping image if object has "ptexture" attribute and set up the texture for further processing.

Parameters:

PObj:	Object to extract its texture mapping function if has one. Note its attributes might be affected.

Returned Value:

int: TRUE if object has texture mapping, FALSE otherwise.

See Also:

IGInitSrfMovie IGClearObjTextureMovieAttr IGInitSrfTextureFromImage

Keywords:

IGInitSrfTextureFromImage

(grap_gen.c:1369)

Prototype:

int IGInitSrfTextureFromImage(const IPObjectStruct *PObj, int SrfIdx, void *Image, int ImageWidth, int ImageHeight, int ImageAlpha)

Description:

Apply a texture mapping image to object PObj and set up the texture for further processing.

Parameters:

PObj:	Object to apply texture mapping image to. Note its attributes might be affected though.
SrfIdx:	If PObj is an object with multiple surfaces (e.g. a MODEL), will apply the texture to that surface (First is 1). If -1 will apply to all surfaces in PObj.
Image:	Image to apply as texture, either IrtImgRGBAPxlStruct or IrtImgPixelStruct, depending on value of ImageAlpha.
ImageWidth:	Width of image to apply.
ImageHeight:	eight of image to apply.
ImageAlpha:	TRUE if image to apply has Alpha, FALSE otherwise.

Returned Value:

int: TRUE if successful, FALSE otherwise.

See Also:

IGInitSrfTexture

Keywords:

IGLoadGeometry

(grap_gen.c:143)

Prototype:

IPObjectStruct *IGLoadGeometry(const char **FileNames, int NumFiles)

Description:

Get data. This function also updates the following global variables: + IPViewMat, IPPrspMat are update with the respective matrices, if found. + IPWasViewMat, IPWasPrspMat are set to TRUE if above matrices were found. + IGState.LastProcessMat is updated with the most current matrix value. + IGState.ViewMode is updated with view mode - perspective or orthographic.

Parameters:

FileNames:	Names of files from which to read the geometry.
NumFiles:	Number of files in array of names FileNames.

Returned Value:

IPObjectStruct *: Read geometry, NULL if error or no geometry.

See Also:

IPGetDataFiles

Keywords:

IGSaveCurrentMat

(grap_gen.c:194)

Prototype:

void IGSaveCurrentMat(int ViewMode, char *Name)

Description:

Saves the current viewing matrices.

Parameters:

ViewMode:	Either perspective or orthographic.
Name:	File name to save current view at.

Returned Value:

void

See Also:

IGSubmitCurrentMat

Keywords:

IGSetCtlMeshPostFunc

(grap_gen.c:2381)

Prototype:

IGDrawUpdateFuncType IGSetCtlMeshPostFunc(IGDrawUpdateFuncType Func)

Description:

Sets a call back function to handle setting after control mesh draw.

Parameters:

Func:	ew callback function to use, or NULL to disable.

Returned Value:

IGDrawUpdateFuncType: Old callback function used.

Keywords:

IGSetCtlMeshPreFunc

(grap_gen.c:2358)

Prototype:

IGDrawUpdateFuncType IGSetCtlMeshPreFunc(IGDrawUpdateFuncType Func)

Description:

Sets a call back function to handle setting before control mesh draw.

Parameters:

Func:	ew callback function to use, or NULL to disable.

Returned Value:

IGDrawUpdateFuncType: Old callback function used.

Keywords:

IGSetSketchPostFunc

(grap_gen.c:2335)

Prototype:

IGDrawUpdateFuncType IGSetSketchPostFunc(IGDrawUpdateFuncType Func)

Description:

Sets a call back function to handle setting after sketch style draw.

Parameters:

Func:	ew callback function to use, or NULL to disable.

Returned Value:

IGDrawUpdateFuncType: Old callback function used.

Keywords:

IGSetSketchPreFunc

(grap_gen.c:2312)

Prototype:

IGDrawUpdateFuncType IGSetSketchPreFunc(IGDrawUpdateFuncType Func)

Description:

Sets a call back function to handle setting before sketch style draw.

Parameters:

Func:	ew callback function to use, or NULL to disable.

Returned Value:

IGDrawUpdateFuncType: Old callback function used.

Keywords:

IGSetSrfPolysPostFunc

(grap_gen.c:2243)

Prototype:

IGDrawUpdateFuncType IGSetSrfPolysPostFunc(IGDrawUpdateFuncType Func)

Description:

Sets a call back function to handle setting after polygons are drawn.

Parameters:

Func:	ew callback function to use, or NULL to disable.

Returned Value:

IGDrawUpdateFuncType: Old callback function used.

Keywords:

IGSetSrfPolysPreFunc

(grap_gen.c:2219)

Prototype:

IGDrawUpdateFuncType IGSetSrfPolysPreFunc(IGDrawUpdateFuncType Func)

Description:

Sets a call back function to handle setting before polygons are drawn.

Parameters:

Func:	ew callback function to use, or NULL to disable.

Returned Value:

IGDrawUpdateFuncType: Old callback function used.

Keywords:

IGSetSrfWirePostFunc

(grap_gen.c:2289)

Prototype:

IGDrawUpdateFuncType IGSetSrfWirePostFunc(IGDrawUpdateFuncType Func)

Description:

Sets a call back function to handle setting after wireframe draw.

Parameters:

Func:	ew callback function to use, or NULL to disable.

Returned Value:

IGDrawUpdateFuncType: Old callback function used.

Keywords:

IGSetSrfWirePreFunc

(grap_gen.c:2266)

Prototype:

IGDrawUpdateFuncType IGSetSrfWirePreFunc(IGDrawUpdateFuncType Func)

Description:

Sets a call back function to handle setting before wireframe draw.

Parameters:

Func:	ew callback function to use, or NULL to disable.

Returned Value:

IGDrawUpdateFuncType: Old callback function used.

Keywords:

IGSketchDrawPolygons

(sketches.c:791)

Prototype:

void IGSketchDrawPolygons(IPObjectStruct *PObjSketches)

Description:

Generates a sketch like drawing of the polygonal object, on the fly if needed, and display it.

Parameters:

PObjSketches:	A sketches object.

Returned Value:

void

Keywords:

IGSketchDrawSurface

(sketches.c:168)

Prototype:

void IGSketchDrawSurface(const IPObjectStruct *PObjSketches)

Description:

Generates a sketch like drawing of a surface.

Parameters:

PObjSketches:	A sketches object.

Returned Value:

void

Keywords:

IGSketchGenPolyImportanceSketches

(sketches.c:1146)

Prototype:

IPObjectStruct *IGSketchGenPolyImportanceSketches(IPObjectStruct *PObj, IGSketchParamStruct *SketchParams, IrtRType FineNess)

Description:

Precompute the strokes that emphasize important features in the geometry using an importance measure that looks at the diherdal angle of adjacent polygons.

Parameters:

PObj:	Polygonal model to process for importance.
SketchParams:	PR sketch parameters' info structure.
FineNess:	Of marching steps on the surface.

Returned Value:

IPObjectStruct *: Traced strokes as piecewise linear approximations.

See Also:

IGSketchGenPolySketches

Keywords:

IGSketchGenPolySketches

(sketches.c:821)

Prototype:

IPObjectStruct *IGSketchGenPolySketches(IPObjectStruct *PlObj, IrtRType FineNess, int Importance)

Description:

Generates a sketch like drawing for the given polygonal object.

Parameters:

PlObj:	The polygonal object to process.
FineNess:	Relative fineness to approximate the sketchs of PlObj with.
Importance:	f TRUE, we should also compute importance for each point.

Returned Value:

IPObjectStruct *: The sketch data.

See Also:

IGSketchGenPolyImportanceSketches

Keywords:

IGSketchGenSrfSketches

(sketches.c:415)

Prototype:

IPObjectStruct *IGSketchGenSrfSketches(const CagdSrfStruct *InSrf, IrtRType FineNess, const IPObjectStruct *PObj, int Importance)

Description:

Generates a sketch like drawing for the given surface with the fineness prescribed.

Parameters:

InSrf:	Input surface to gene sketch geometry for.
FineNess:	Relative fineness to approximate the sketches with.
PObj:	Object Srf originated from.
Importance:	If TRUE, we should also compute importance for each point.

Returned Value:

IPObjectStruct *: The sketch data.

Keywords:

IGUpdateFPS

(grap_gen.c:2183)

Prototype:

void IGUpdateFPS(int Start)

Description:

Update the current frame per second.

Parameters:

Start:	TRUE to start timing, FALSE to end it.

Returned Value:

void

Keywords:

IGUpdateObjectBBox

(grap_gen.c:420)

Prototype:

void IGUpdateObjectBBox(IPObjectStruct *PObj)

Description:

Update the BBox of the given object if has none.

Parameters:

PObj:	Objects to update its BBOX.

Returned Value:

void

Keywords:

IGUpdateViewConsideringScale

(grap_gen.c:457)

Prototype:

void IGUpdateViewConsideringScale(IrtHmgnMatType Mat)

Description:

Updates the global view matrix IPViewMat with given matrix Mat while preserving the scaling factor in the original global view.

Parameters:

Mat:	.S.F.I.

Returned Value:

void

Keywords: