pfCone(3pf) OpenGL Performer 3.2.2 libpf C Reference Pages pfCone(3pf)NAME
pfGetConeClassType, pfNewCone, pfConeRadius, pfGetConeRadius,
pfConeEvalPt, pfConeEvalNorm - A parametric cone
FUNCTION SPECIFICATION
#include <Performer/pf.h>
pfType * pfGetConeClassType(void);
pfCone* pfNewCone(void *arena);
void pfConeRadius(pfCone *sphere, pfReal radiusVal);
pfReal pfGetConeRadius(pfCone *sphere);
void pfConeEvalPt(pfCone *sphere, pfReal u, pfReal v, pfVec3 pnt);
void pfConeEvalNorm(pfCone *sphere, pfReal u, pfReal v,
pfVec3 norm);
PARENT CLASS FUNCTIONS
The OpenGL Performer class pfCone is derived from the parent class
pfParaSurface, so each of these member functions of class pfParaSurface
are also directly usable with objects of class pfCone. Casting an object
of class pfCone to an object of class pfParaSurface is taken care of
automatically. This is also true for casts to objects of ancestor
classes of class pfParaSurface.
void pfParaSurfaceBeginU(pfParaSurface* surf, pfReal u);
void pfParaSurfaceEndU(pfParaSurface* surf, pfReal u);
void pfParaSurfaceBeginV(pfParaSurface* surf, pfReal v);
void pfParaSurfaceEndV(pfParaSurface* surf, pfReal v);
void pfParaSurfaceSolidId(pfParaSurface* surf, int solidId);
void pfParaSurfaceTopoId(pfParaSurface* surf, int topoId);
void pfParaSurfaceSurfaceId(pfParaSurface* surf, int surfaceId);
pfReal pfGetParaSurfaceBeginU(pfParaSurface* surf);
pfReal pfGetParaSurfaceEndU(pfParaSurface* surf);
pfReal pfGetParaSurfaceBeginV(pfParaSurface* surf);
pfReal pfGetParaSurfaceEndV(pfParaSurface* surf);
int pfGetParaSurfaceTrimLoopCount(pfParaSurface* surf);
pfLoop pfGetParaSurfaceTrimLoopClosed(pfParaSurface* surf,
int loopNum);
int pfGetParaSurfaceTrimCurveCount(pfParaSurface* surf,
int loopNum);
pfEdge* pfGetParaSurfaceTrimCurve(pfParaSurface* surf, int loopNum,
int curveNum);
pfTopo* pfGetParaSurfaceTopo(pfParaSurface* surf);
int pfGetParaSurfaceTopoId(pfParaSurface* surf);
int pfGetParaSurfaceSolidId(pfParaSurface* surf);
int pfGetParaSurfaceSurfaceId(pfParaSurface* surf);
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void pfParaSurfaceHandednessHint(pfParaSurface* surf,
pfBool _clockWise);
pfBool pfGetParaSurfaceHandednessHint(pfParaSurface* surf);
void pfParaSurfaceInsertTrimCurve(pfParaSurface* surf,
int loopNum, pfCurve2d *c, pfDisCurve2d *d);
void pfParaSurfaceAddTrimCurve(pfParaSurface* surf, int loopNum,
pfCurve2d *c, pfDisCurve2d *d);
void pfParaSurfaceTrimLoopClosed(pfParaSurface* surf,
int loopNum, pfLoop closed);
void pfParaSurfaceEvalPt(pfParaSurface* surf, pfReal u,
pfReal v, pfVec3 pnt);
void pfParaSurfaceEvalDu(pfParaSurface* surf, pfReal u,
pfReal v, pfVec3 Du);
void pfParaSurfaceEvalDv(pfParaSurface* surf, pfReal u,
pfReal v, pfVec3 Dv);
void pfParaSurfaceEvalDuu(pfParaSurface* surf, pfReal u,
pfReal v, pfVec3 Duu);
void pfParaSurfaceEvalDvv(pfParaSurface* surf, pfReal u,
pfReal v, pfVec3 Dvv);
void pfParaSurfaceEvalDuv(pfParaSurface* surf, pfReal u,
pfReal v, pfVec3 Duv);
void pfParaSurfaceEvalNorm(pfParaSurface* surf, pfReal u,
pfReal v, pfVec3 norm);
void pfParaSurfaceEvalD(pfParaSurface* surf, pfReal u, pfReal v,
pfReal theta, pfVec3 D);
void pfParaSurfaceEvalDD(pfParaSurface* surf, pfReal u,
pfReal v, pfReal theta, pfVec3 DD);
int pfParaSurfaceGState(pfParaSurface* surf,
pfGeoState *gState);
pfGeoState* pfGetParaSurfaceGState(pfParaSurface* surf);
void pfParaSurfaceClearTessellation(pfParaSurface* surf);
Since the class pfParaSurface is itself derived from the parent class
pfGeode, objects of class pfCone can also be used with these functions
designed for objects of class pfGeode.
void pfRepOrigin(pfRep *rep, const pfVec3 origin);
void pfRepOrient(pfRep *rep, const pfMatrix mat);
void pfGetRepOrigin(pfRep *rep, pfVec3* origin);
void pfGetRepOrient(pfRep *rep, pfMatrix *mat);
Since the class pfGeode is itself derived from the parent class pfGeode,
objects of class pfCone can also be used with these functions designed
for objects of class pfGeode.
int pfAddGSet(pfGeode* geode, pfGeoSet* gset);
int pfRemoveGSet(pfGeode* geode, pfGeoSet* gset);
int pfInsertGSet(pfGeode* geode, int index, pfGeoSet* gset);
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int pfReplaceGSet(pfGeode* geode, pfGeoSet* old, pfGeoSet* new);
pfGeoSet * pfGetGSet(const pfGeode* geode, int index);
int pfGetNumGSets(const pfGeode* geode);
Since the class pfGeode is itself derived from the parent class pfNode,
objects of class pfCone can also be used with these functions designed
for objects of class pfNode.
pfGroup * pfGetParent(const pfNode *node, int i);
int pfGetNumParents(const pfNode *node);
void pfNodeBSphere(pfNode *node, pfSphere *bsph, int mode);
int pfGetNodeBSphere(pfNode *node, pfSphere *bsph);
pfNode* pfClone(pfNode *node, int mode);
pfNode* pfBufferClone(pfNode *node, int mode, pfBuffer *buf);
int pfFlatten(pfNode *node, int mode);
int pfNodeName(pfNode *node, const char *name);
const char * pfGetNodeName(const pfNode *node);
pfNode* pfFindNode(pfNode *node, const char *pathName,
pfType *type);
pfNode* pfLookupNode(const char *name, pfType* type);
int pfNodeIsectSegs(pfNode *node, pfSegSet *segSet,
pfHit **hits[]);
void pfNodeTravMask(pfNode *node, int which, uint mask,
int setMode, int bitOp);
uint pfGetNodeTravMask(const pfNode *node, int which);
void pfNodeTravFuncs(pfNode* node, int which,
pfNodeTravFuncType pre, pfNodeTravFuncType post);
void pfGetNodeTravFuncs(const pfNode* node, int which,
pfNodeTravFuncType *pre, pfNodeTravFuncType *post);
void pfNodeTravData(pfNode *node, int which, void *data);
void * pfGetNodeTravData(const pfNode *node, int which);
void pfNodeTravMode(pfNode* node, int which, int mode,
int val);
int pfGetNodeTravMode(const pfNode* node, int which,
int mode);
Since the class pfNode is itself derived from the parent class pfObject,
objects of class pfCone can also be used with these functions designed
for objects of class pfObject.
void pfUserDataSlot(pfObject *obj, int slot, void *data);
void pfUserData(pfObject *obj, void *data);
void* pfGetUserDataSlot(pfObject *obj, int slot);
void* pfGetUserData(pfObject *obj);
int pfGetNumUserData(pfObject *obj);
int pfGetNamedUserDataSlot(const char *name);
const char* pfGetUserDataSlotName(int slot);
int pfGetNumNamedUserDataSlots(void);
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pfCone(3pf) OpenGL Performer 3.2.2 libpf C Reference Pages pfCone(3pf)
int pfDeleteGLHandle(pfObject *obj);
Since the class pfObject is itself derived from the parent class
pfMemory, objects of class pfCone can also be used with these functions
designed for objects of class pfMemory.
pfType * pfGetType(const void *ptr);
int pfIsOfType(const void *ptr, pfType *type);
int pfIsExactType(const void *ptr, pfType *type);
const char * pfGetTypeName(const void *ptr);
int pfRef(void *ptr);
int pfUnref(void *ptr);
int pfUnrefDelete(void *ptr);
int pfUnrefGetRef(void *ptr);
int pfGetRef(const void *ptr);
int pfCopy(void *dst, void *src);
int pfDelete(void *ptr);
int pfIsFluxed(void *ptr);
int pfCompare(const void *ptr1, const void *ptr2);
void pfPrint(const void *ptr, uint which, uint verbose,
FILE *file);
void * pfGetArena(void *ptr);
DESCRIPTION
A cone is a parametric surface defined by taking a circle in the x/y
plane and sweeping it a fixed distance along the z-axis in the positive
and negative directions while varying the radius of the circle as a
linear function of the distance swept. The sweeping distance is referred
to as the half height of the cone. Since the cone is centered at the
origin, the total height is twice the sweeping distance.
The surface is defined as:
x(u,v) = radius * cos(u) * alpha
y(u,v) = radius * sin(u) * alpha
z(u,v) = v
where
alpha = 1.0 - (v - beginV) / (endV - beginV)
The radius is the radius of the bottom circle. The u parameter is mapped
radially about cone and has a domain of 0 to 2*Pi. The v parameter is
mapped to the height. To obtain an arbitrarily-oriented cone, use pfRep
orientation matrix.
pfGetConeClassType returns the pfType* for the class pfCone. The pfType*
returned by pfGetConeClassType is the same as the pfType* returned by
invoking pfGetType on any instance of class pfCone. Because OpenGL
Performer allows subclassing of built-in types, when decisions are made
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pfCone(3pf) OpenGL Performer 3.2.2 libpf C Reference Pages pfCone(3pf)
based on the type of an object, it is usually better to use pfIsOfType to
test if an object is of a type derived from a Performer type rather than
to test for strict equality of the pfType*'s.
pfNewCone creates an instance of pfCone with radius set to 1 and height
set to 2.
pfConeRadius sets the cone's radius.
pfGetConeRadius returns the cone's mid-point radius.
pfConeHeight sets the cone's length.
pfGetConeHeight returns the cone's height.
pfConeEvalPt evaluates the surface value of the cone at parametric values
u and v and stores the result in pnt. The value of u is assumed to be in
radians with a domain of 0 to 2*PI. Values outside of this domain may
produce undefined results.
pfConeEvalNorm evaluates the normal of the cone at parametric values u
and v stores the result in norm. The value of u is assumed to be assumed
to be in radians with a domain of 0 to 2*PI. Values outside this domain
may produce undefined results.
The normal is defined as the right hand rule cross product of
<du/dx,du/dy,du/dz> and <dv/dx,dv/dy,dv/dz>.
SEE ALSO
pfRep, pfGeode, pfParaSurface
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