Panda3D
Public Member Functions | Static Public Member Functions | Public Attributes | List of all members
EggNurbsCurve Class Reference

A parametric NURBS curve. More...

Inheritance diagram for EggNurbsCurve:
EggCurve EggPrimitive EggNode EggAttributes EggRenderMode EggNamedObject EggObject Namable TypedReferenceCount TypedObject ReferenceCount

Public Member Functions

 __init__ (const EggNurbsCurve copy)
 
 __init__ (str name)
 
int getDegree ()
 Returns the degree of the curve. More...
 
double getKnot (int k)
 Returns the nth knot value defined. More...
 
list getKnots ()
 
int getNumCvs ()
 Returns the total number of control vertices that should be defined for the curve. More...
 
int getNumKnots ()
 Returns the number of knots. More...
 
int getOrder ()
 Returns the order of the curve. More...
 
bool isClosed ()
 Returns true if the curve appears to be closed. More...
 
bool isValid ()
 Returns true if the NURBS parameters are all internally consistent (e.g. More...
 
EggNurbsCurve operator= (const EggNurbsCurve copy)
 
 setKnot (int k, double value)
 Resets the value of the indicated knot as indicated. More...
 
 setNumKnots (int num)
 Directly changes the number of knots. More...
 
 setOrder (int order)
 Directly changes the order to the indicated value (which must be an integer in the range 1 <= order <= 4). More...
 
 setup (int order, int num_knots)
 Prepares a new curve definition with the indicated order and number of knots. More...
 
- Public Member Functions inherited from EggCurve
EggCurve::CurveType getCurveType ()
 Returns the indicated type of the curve. More...
 
int getSubdiv ()
 Returns the requested number of subdivisions, or 0 if no particular subdivisions have been requested. More...
 
EggCurve operator= (const EggCurve copy)
 
 setCurveType (EggCurve::CurveType type)
 Sets the type of the curve. More...
 
 setSubdiv (int subdiv)
 Sets the number of subdivisions that will be requested across the curve. More...
 
- Public Member Functions inherited from EggPrimitive
 addTexture (EggTexture texture)
 Applies the indicated texture to the primitive. More...
 
EggVertex addVertex (EggVertex vertex)
 Adds the indicated vertex to the end of the primitive's list of vertices, and returns it. More...
 
 applyFirstAttribute ()
 Sets the first vertex of the triangle (or each component) to the primitive normal and/or color, if the primitive is flat-shaded. More...
 
 applyLastAttribute ()
 Sets the last vertex of the triangle (or each component) to the primitive normal and/or color, if the primitive is flat-shaded. More...
 
bool cleanup ()
 Cleans up modeling errors in whatever context this makes sense. More...
 
 clear ()
 Removes all of the vertices from the primitive. More...
 
 clearConnectedShading ()
 Resets the connected_shading member in this primitive, so that get_connected_shading() will recompute a new value. More...
 
 clearMaterial ()
 Removes any material from the primitive. More...
 
 clearTexture ()
 Removes any texturing from the primitive. More...
 
 copyAttributes (const EggAttributes other)
 Copies the rendering attributes from the indicated primitive. More...
 
 copyAttributes (const EggPrimitive other)
 Copies the rendering attributes from the indicated primitive. More...
 
 copyVertices (const EggPrimitive other)
 Replaces the current primitive's list of vertices with a copy of the list of vertices on the other primitive. More...
 
EggRenderMode determineAlphaMode ()
 Walks back up the hierarchy, looking for an EggGroup or EggPrimitive or some such object at this level or above this primitive that has an alpha_mode other than AM_unspecified. More...
 
EggRenderMode determineBin ()
 Walks back up the hierarchy, looking for an EggGroup or EggPrimitive or some such object at this level or above this primitive that has a bin specified. More...
 
EggRenderMode determineDepthOffset ()
 Walks back up the hierarchy, looking for an EggGroup or EggPrimitive or some such object at this level or above this primitive that has a depth_offset specified. More...
 
EggRenderMode determineDepthTestMode ()
 Walks back up the hierarchy, looking for an EggGroup or EggPrimitive or some such object at this level or above this node that has a depth_test_mode other than DTM_unspecified. More...
 
EggRenderMode determineDepthWriteMode ()
 Walks back up the hierarchy, looking for an EggGroup or EggPrimitive or some such object at this level or above this node that has a depth_write_mode other than DWM_unspecified. More...
 
EggRenderMode determineDrawOrder ()
 Walks back up the hierarchy, looking for an EggGroup or EggPrimitive or some such object at this level or above this primitive that has a draw_order specified. More...
 
EggRenderMode determineVisibilityMode ()
 Walks back up the hierarchy, looking for an EggGroup or EggPrimitive or some such object at this level or above this node that has a visibility_mode other than VM_unspecified. More...
 
bool getBfaceFlag ()
 Retrieves the backfacing flag of the polygon. More...
 
EggPrimitive::Shading getConnectedShading ()
 Determines what sort of shading properties this primitive's connected neighbors have. More...
 
EggMaterial getMaterial ()
 Returns a pointer to the applied material, or NULL if there is no material applied. More...
 
int getNumTextures ()
 Returns the number of textures applied to the primitive. More...
 
int getNumVertices ()
 
EggVertexPool getPool ()
 Returns the vertex pool associated with the vertices of the primitive, or NULL if the primitive has no vertices. More...
 
EggPrimitive::Shading getShading ()
 Returns the shading properties apparent on this particular primitive. More...
 
str getSortName ()
 Returns the name of the primitive for the purposes of sorting primitives into different groups, if there is one. More...
 
EggTexture getTexture ()
 Returns the first texture on the primitive, if any, or NULL if there are no textures on the primitive. More...
 
EggTexture getTexture (int n)
 Returns the nth texture that has been applied to the primitive. More...
 
list getTextures ()
 
EggVertex getVertex (int index)
 Returns a particular index based on its index number. More...
 
list getVertices ()
 
bool hasMaterial ()
 Returns true if the primitive is materiald (and get_material() will return a real pointer), false otherwise (and get_material() will return NULL). More...
 
bool hasNormals ()
 Returns true if any of the primitives (e.g. More...
 
bool hasPrimitives ()
 Returns true if there are any primitives (e.g. More...
 
bool hasTexture ()
 Returns true if the primitive has any textures specified, false otherwise. More...
 
bool hasTexture (EggTexture texture)
 Returns true if the primitive has the particular indicated texture, false otherwise. More...
 
bool hasVertexColor ()
 Returns true if any vertex on the primitive has a specific color set, false otherwise. More...
 
bool hasVertexNormal ()
 Returns true if any vertex on the primitive has a specific normal set, false otherwise. More...
 
 insertVertex (int index, EggVertex vertex)
 Inserts a vertex at the given position. More...
 
bool jointHasPrimitives ()
 Returns true if there are any primitives (e.g. More...
 
EggPrimitive makeCopy ()
 
EggPrimitive operator= (const EggPrimitive copy)
 
 postApplyFlatAttribute ()
 Intended as a followup to apply_last_attribute(), this also sets an attribute on the first vertices of the primitive, if they don't already have an attribute set, just so they end up with something. More...
 
 removeDoubledVerts (bool closed)
 Certain kinds of primitives, particularly polygons, don't like to have the same vertex repeated consecutively. More...
 
 removeNonuniqueVerts ()
 Removes any multiple appearances of the same vertex from the primitive. More...
 
EggVertex removeVertex (EggVertex vertex)
 Removes the indicated vertex from the primitive and returns it. More...
 
 removeVertex (int index)
 Removes the indicated vertex from the primitive. More...
 
 reverseVertexOrdering ()
 Reverses the ordering of the vertices in this primitive, if appropriate, in order to change the direction the polygon appears to be facing. More...
 
 setBfaceFlag (bool flag)
 Sets the backfacing flag of the polygon. More...
 
 setMaterial (EggMaterial material)
 Applies the indicated material to the primitive. More...
 
 setTexture (EggTexture texture)
 Replaces the current list of textures with the indicated texture. More...
 
 setVertex (int index, EggVertex vertex)
 Replaces a particular vertex based on its index number in the list of vertices. More...
 
 testVrefIntegrity ()
 
 unifyAttributes (EggPrimitive::Shading shading)
 If the shading property is S_per_vertex, ensures that all vertices have a normal and a color, and the overall primitive does not. More...
 
 write (Ostream out, int indent_level)
 
- Public Member Functions inherited from EggNode
 applyTexmats ()
 Applies the texture matrices to the UV's of the vertices that reference them, and then removes the texture matrices from the textures themselves. More...
 
EggRenderMode determineAlphaMode ()
 Walks back up the hierarchy, looking for an EggGroup or EggPrimitive or some such object at this level or above this node that has an alpha_mode other than AM_unspecified. More...
 
EggRenderMode determineBin ()
 Walks back up the hierarchy, looking for an EggGroup or EggPrimitive or some such object at this level or above this node that has a bin specified. More...
 
bool determineDecal ()
 Walks back up the hierarchy, looking for an EggGroup at this level or above that has the "decal" flag set. More...
 
EggRenderMode determineDepthOffset ()
 Walks back up the hierarchy, looking for an EggGroup or EggPrimitive or some such object at this level or above this node that has a depth_offset specified. More...
 
EggRenderMode determineDepthTestMode ()
 Walks back up the hierarchy, looking for an EggGroup or EggPrimitive or some such object at this level or above this node that has a depth_test_mode other than DTM_unspecified. More...
 
EggRenderMode determineDepthWriteMode ()
 Walks back up the hierarchy, looking for an EggGroup or EggPrimitive or some such object at this level or above this node that has a depth_write_mode other than DWM_unspecified. More...
 
EggRenderMode determineDrawOrder ()
 Walks back up the hierarchy, looking for an EggGroup or EggPrimitive or some such object at this level or above this node that has a draw_order specified. More...
 
bool determineIndexed ()
 Walks back up the hierarchy, looking for an EggGroup at this level or above that has the "indexed" scalar set. More...
 
EggRenderMode determineVisibilityMode ()
 Walks back up the hierarchy, looking for an EggGroup or EggPrimitive or some such object at this level or above this node that has a visibility_mode other than VM_unspecified. More...
 
 flattenTransforms ()
 Removes any transform and instance records from this node in the scene graph and below. More...
 
int getDepth ()
 Returns the number of nodes above this node in the egg hierarchy. More...
 
const LMatrix4d getNodeFrame ()
 Returns the coordinate frame of the node itself. More...
 
const LMatrix4d getNodeFrameInv ()
 Returns the inverse of the matrix returned by get_node_frame(). More...
 
const LMatrix4d getNodeFrameInvPtr ()
 Returns either a NULL pointer or a unique pointer shared by nodes with the same get_node_frame_inv() matrix. More...
 
const LMatrix4d getNodeFramePtr ()
 Returns either a NULL pointer or a unique pointer shared by nodes with the same get_node_frame() matrix. More...
 
const LMatrix4d getNodeToVertex ()
 Returns the transformation matrix suitable for converting vertices in the coordinate space of the node to the appropriate coordinate space for storing in the egg file. More...
 
const LMatrix4d getNodeToVertexPtr ()
 Returns either a NULL pointer or a unique pointer shared by nodes with the same get_node_to_vertex() matrix. More...
 
EggGroupNode getParent ()
 
const LMatrix4d getVertexFrame ()
 Returns the coordinate frame of the vertices referenced by primitives at or under this node. More...
 
const LMatrix4d getVertexFrameInv ()
 Returns the inverse of the matrix returned by get_vertex_frame(). More...
 
const LMatrix4d getVertexFrameInvPtr ()
 Returns either a NULL pointer or a unique pointer shared by nodes with the same get_vertex_frame_inv() matrix. More...
 
const LMatrix4d getVertexFramePtr ()
 Returns either a NULL pointer or a unique pointer shared by nodes with the same get_vertex_frame() matrix. More...
 
const LMatrix4d getVertexToNode ()
 Returns the transformation matrix suitable for converting the vertices as read from the egg file into the coordinate space of the node. More...
 
const LMatrix4d getVertexToNodePtr ()
 Returns either a NULL pointer or a unique pointer shared by nodes with the same get_vertex_to_node() matrix. More...
 
bool isAnimMatrix ()
 Returns true if this node represents a table of animation transformation data, false otherwise. More...
 
bool isJoint ()
 Returns true if this particular node represents a <Joint> entry or not. More...
 
bool isLocalCoord ()
 Returns true if this node's vertices are not in the global coordinate space. More...
 
bool isUnderInstance ()
 Returns true if there is an <Instance> node somewhere in the egg tree at or above this node, false otherwise. More...
 
bool isUnderTransform ()
 Returns true if there is a <Transform> entry somewhere in the egg tree at or above this node, false otherwise. More...
 
EggNode operator= (const EggNode copy)
 
bool parseEgg (str egg_syntax)
 Parses the egg syntax given in the indicate string as if it had been read from the egg file within this object's definition. More...
 
int renameNode (VectorString strip_prefix)
 Rename by stripping out the prefix. More...
 
 testUnderIntegrity ()
 
 transform (const LMatrix4d mat)
 Applies the indicated transformation to the node and all of its descendants. More...
 
 transformVerticesOnly (const LMatrix4d mat)
 Applies the indicated transformation only to vertices that appear in global space within vertex pools at this node and below. More...
 
 write (Ostream out, int indent_level)
 
- Public Member Functions inherited from EggNamedObject
 __init__ (const EggNamedObject copy)
 
 __init__ (str name)
 
EggNamedObject operator= (const EggNamedObject copy)
 
 output (Ostream out)
 
- Public Member Functions inherited from EggObject
 __init__ ()
 
 __init__ (const EggObject copy)
 
 clearUserData ()
 Removes all user data pointers from the node. More...
 
 clearUserData (TypeHandle type)
 Removes the user data pointer of the indicated type. More...
 
EggUserData getUserData ()
 Returns the user data pointer most recently stored on this object, or NULL if nothing was previously stored. More...
 
EggUserData getUserData (TypeHandle type)
 Returns the user data pointer of the indicated type, if it exists, or NULL if it does not. More...
 
bool hasUserData ()
 Returns true if a generic user data pointer has recently been set and not yet cleared, false otherwise. More...
 
bool hasUserData (TypeHandle type)
 Returns true if the user data pointer of the indicated type has been set, false otherwise. More...
 
EggObject operator= (const EggObject copy)
 
 setUserData (EggUserData user_data)
 Sets the user data associated with this object. More...
 
- Public Member Functions inherited from TypedObject
TypeHandle getType ()
 
int getTypeIndex ()
 Returns the internal index number associated with this object's TypeHandle, a unique number for each different type. More...
 
bool isExactType (TypeHandle handle)
 Returns true if the current object is the indicated type exactly. More...
 
bool isOfType (TypeHandle handle)
 Returns true if the current object is or derives from the indicated type. More...
 
- Public Member Functions inherited from ReferenceCount
int getRefCount ()
 Returns the current reference count. More...
 
 ref ()
 Explicitly increments the reference count. More...
 
bool testRefCountIntegrity ()
 Does some easy checks to make sure that the reference count isn't completely bogus. More...
 
bool testRefCountNonzero ()
 Does some easy checks to make sure that the reference count isn't zero, or completely bogus. More...
 
bool unref ()
 Explicitly decrements the reference count. More...
 
- Public Member Functions inherited from Namable
 __init__ (const Namable)
 
 __init__ (str initial_name)
 
 clearName ()
 Resets the Namable's name to empty. More...
 
str getName ()
 
bool hasName ()
 Returns true if the Namable has a nonempty name set, false if the name is empty. More...
 
 output (Ostream out)
 Outputs the Namable. More...
 
 setName (str name)
 
- Public Member Functions inherited from EggAttributes
 __init__ ()
 
 __init__ (const EggAttributes copy)
 
 clearColor ()
 
 clearNormal ()
 
int compareTo (const EggAttributes other)
 An ordering operator to compare two vertices for sorting order. More...
 
 copyColor (const EggAttributes other)
 Sets this color to be the same as the other's, include morphs. More...
 
 copyNormal (const EggAttributes other)
 Sets this normal to be the same as the other's, include morphs. More...
 
LColor getColor ()
 Returns the color set on this particular attribute. More...
 
const LNormald getNormal ()
 
bool hasColor ()
 
bool hasNormal ()
 
bool matchesColor (const EggAttributes other)
 Returns true if this color matches that of the other EggAttributes object, include the morph list. More...
 
bool matchesNormal (const EggAttributes other)
 Returns true if this normal matches that of the other EggAttributes object, include the morph list. More...
 
EggAttributes operator= (const EggAttributes copy)
 
 setColor (const LColor Color)
 
 setNormal (const LNormald normal)
 
bool sortsLessThan (const EggAttributes other)
 An ordering operator to compare two vertices for sorting order. More...
 
 transform (const LMatrix4d mat)
 Applies the indicated transformation matrix to the attributes. More...
 
 write (Ostream out, int indent_level)
 Writes the attributes to the indicated output stream in Egg format. More...
 
- Public Member Functions inherited from EggRenderMode
 __init__ ()
 
 __init__ (const EggRenderMode copy)
 
 clearBin ()
 Removes the bin name that was set for this particular object. More...
 
 clearDepthOffset ()
 Removes the depth-offset flag from this particular object. More...
 
 clearDrawOrder ()
 Removes the draw-order flag from this particular object. More...
 
EggRenderMode::AlphaMode getAlphaMode ()
 Returns the alpha mode that was set, or AM_unspecified if nothing was set. More...
 
str getBin ()
 Returns the bin name that has been set for this particular object, if any. More...
 
int getDepthOffset ()
 Returns the "depth-offset" flag as set for this particular object. More...
 
EggRenderMode::DepthTestMode getDepthTestMode ()
 Returns the depth_test mode that was set, or DTM_unspecified if nothing was set. More...
 
EggRenderMode::DepthWriteMode getDepthWriteMode ()
 Returns the depth_write mode that was set, or DWM_unspecified if nothing was set. More...
 
int getDrawOrder ()
 Returns the "draw-order" flag as set for this particular object. More...
 
EggRenderMode::VisibilityMode getVisibilityMode ()
 Returns the visibility mode that was set, or VM_unspecified if nothing was set. More...
 
bool hasBin ()
 Returns true if a bin name has been set for this particular object. More...
 
bool hasDepthOffset ()
 Returns true if the depth-offset flag has been set for this particular object. More...
 
bool hasDrawOrder ()
 Returns true if the draw-order flag has been set for this particular object. More...
 
bool operator != (const EggRenderMode other)
 
bool operator< (const EggRenderMode other)
 
EggRenderMode operator= (const EggRenderMode copy)
 
bool operator== (const EggRenderMode other)
 
 setAlphaMode (EggRenderMode::AlphaMode mode)
 Specifies precisely how the transparency for this geometry should be achieved, or if it should be used. More...
 
 setBin (str bin)
 Sets the "bin" string for this particular object. More...
 
 setDepthOffset (int bias)
 Sets the "depth-offset" flag associated with this object. More...
 
 setDepthTestMode (EggRenderMode::DepthTestMode mode)
 Specifies whether this geometry should be tested against the depth buffer when it is drawn (assuming the rendering backend provides a depth buffer). More...
 
 setDepthWriteMode (EggRenderMode::DepthWriteMode mode)
 Specifies whether writes should be made to the depth buffer (assuming the rendering backend provides a depth buffer) when rendering this geometry. More...
 
 setDrawOrder (int order)
 Sets the "draw-order" flag associated with this object. More...
 
 setVisibilityMode (EggRenderMode::VisibilityMode mode)
 Specifies whether this geometry is to be considered normally visible, or hidden. More...
 
 write (Ostream out, int indent_level)
 Writes the attributes to the indicated output stream in Egg format. More...
 

Static Public Member Functions

static TypeHandle getClassType ()
 
- Static Public Member Functions inherited from EggCurve
static TypeHandle getClassType ()
 
static EggCurve::CurveType stringCurveType (str string)
 Returns the CurveType value associated with the given string representation, or CT_invalid if the string does not match any known CurveType value. More...
 
- Static Public Member Functions inherited from EggPrimitive
static TypeHandle getClassType ()
 
- Static Public Member Functions inherited from EggNode
static TypeHandle getClassType ()
 
- Static Public Member Functions inherited from EggNamedObject
static TypeHandle getClassType ()
 
- Static Public Member Functions inherited from EggObject
static TypeHandle getClassType ()
 
- Static Public Member Functions inherited from TypedReferenceCount
static TypeHandle getClassType ()
 
- Static Public Member Functions inherited from TypedObject
static TypeHandle getClassType ()
 
- Static Public Member Functions inherited from ReferenceCount
static TypeHandle getClassType ()
 
- Static Public Member Functions inherited from Namable
static TypeHandle getClassType ()
 
- Static Public Member Functions inherited from EggAttributes
static TypeHandle getClassType ()
 
- Static Public Member Functions inherited from EggRenderMode
static TypeHandle getClassType ()
 
static EggRenderMode::AlphaMode stringAlphaMode (str string)
 Returns the AlphaMode value associated with the given string representation, or AM_unspecified if the string does not match any known AlphaMode value. More...
 
static EggRenderMode::DepthTestMode stringDepthTestMode (str string)
 Returns the DepthTestMode value associated with the given string representation, or DTM_unspecified if the string does not match any known DepthTestMode value. More...
 
static EggRenderMode::DepthWriteMode stringDepthWriteMode (str string)
 Returns the DepthWriteMode value associated with the given string representation, or DWM_unspecified if the string does not match any known DepthWriteMode value. More...
 
static EggRenderMode::VisibilityMode stringVisibilityMode (str string)
 Returns the HiddenMode value associated with the given string representation, or VM_unspecified if the string does not match any known HiddenMode value. More...
 

Public Attributes

bool closed
 Returns true if the curve appears to be closed. More...
 
int degree
 Returns the degree of the curve. More...
 
double knots []
 
int order
 Returns the order of the curve. More...
 
- Public Attributes inherited from EggPrimitive
bool bface_flag
 Retrieves the backfacing flag of the polygon. More...
 
EggPrimitive::Shading connected_shading
 Determines what sort of shading properties this primitive's connected neighbors have. More...
 
EggMaterial material
 Returns a pointer to the applied material, or NULL if there is no material applied. More...
 
EggVertexPool pool
 Returns the vertex pool associated with the vertices of the primitive, or NULL if the primitive has no vertices. More...
 
EggPrimitive::Shading shading
 Returns the shading properties apparent on this particular primitive. More...
 
String sort_name
 Returns the name of the primitive for the purposes of sorting primitives into different groups, if there is one. More...
 
EggTexture textures []
 
EggVertex vertices []
 
- Public Attributes inherited from EggNode
int depth
 Returns the number of nodes above this node in the egg hierarchy. More...
 
EggGroupNode parent
 
- Public Attributes inherited from TypedObject
TypeHandle type
 Returns the TypeHandle representing this object's type. More...
 
- Public Attributes inherited from ReferenceCount
int ref_count
 The current reference count. More...
 
- Public Attributes inherited from Namable
const String name
 
- Public Attributes inherited from EggAttributes
EggMorphNormalList _dnormals
 
EggMorphColorList _drgbas
 

Additional Inherited Members

- Public Types inherited from EggCurve
enum  CurveType { CT_none = 0, CT_xyz = 1, CT_hpr = 2, CT_t = 3 }
 
- Public Types inherited from EggPrimitive
enum  Shading { S_unknown = 0, S_overall = 1, S_per_face = 2, S_per_vertex = 3 }
 
- Public Types inherited from EggRenderMode
enum  AlphaMode {
  AM_unspecified = 0, AM_off = 1, AM_on = 2, AM_blend = 3,
  AM_blend_no_occlude = 4, AM_ms = 5, AM_ms_mask = 6, AM_binary = 7,
  AM_dual = 8, AM_premultiplied = 9
}
 
enum  DepthTestMode { DTM_unspecified = 0, DTM_off = 1, DTM_on = 2 }
 
enum  DepthWriteMode { DWM_unspecified = 0, DWM_off = 1, DWM_on = 2 }
 
enum  VisibilityMode { VM_unspecified = 0, VM_hidden = 1, VM_normal = 2 }
 

Detailed Description

A parametric NURBS curve.

Member Function Documentation

◆ __init__() [1/2]

__init__ ( const EggNurbsCurve  copy)

◆ __init__() [2/2]

__init__ ( str  name)

◆ getClassType()

static TypeHandle getClassType ( )
static

◆ getDegree()

int getDegree ( )

Returns the degree of the curve.

For a typical NURBS, the degree is 3.

◆ getKnot()

double getKnot ( int  k)

Returns the nth knot value defined.

◆ getKnots()

list getKnots ( )

◆ getNumCvs()

int getNumCvs ( )

Returns the total number of control vertices that should be defined for the curve.

This is determined by the number of knots and the order, in each direction; it does not necessarily reflect the number of vertices that have actually been added to the curve. (However, if the number of vertices in the curve are wrong, the curve is invalid.)

◆ getNumKnots()

int getNumKnots ( )

Returns the number of knots.

◆ getOrder()

int getOrder ( )

Returns the order of the curve.

The order is the degree of the NURBS equation plus 1; for a typical NURBS, the order is 4. With this implementation of NURBS, the order must be in the range [1, 4].

◆ isClosed()

bool isClosed ( )

Returns true if the curve appears to be closed.

Since the Egg syntax does not provide a means for explicit indication of closure, this has to be guessed at by examining the curve itself.

◆ isValid()

bool isValid ( )

Returns true if the NURBS parameters are all internally consistent (e.g.

it has the right number of vertices to match its number of knots and order in each dimension), or false otherwise.

◆ operator=()

EggNurbsCurve operator= ( const EggNurbsCurve  copy)

◆ setKnot()

setKnot ( int  k,
double  value 
)

Resets the value of the indicated knot as indicated.

k must be in the range 0 <= k < get_num_knots(), and the value must be in the range get_knot(k - 1) <= value <= get_knot(k + 1).

◆ setNumKnots()

setNumKnots ( int  num)

Directly changes the number of knots.

This will either add zero-valued knots onto the end, or truncate knot values from the end, depending on whether the list is being increased or decreased. If possible, it is preferable to use the setup() method instead of directly setting the number of knots, as this may result in an invalid curve.

◆ setOrder()

setOrder ( int  order)

Directly changes the order to the indicated value (which must be an integer in the range 1 <= order <= 4).

If possible, it is preferable to use the setup() method instead of this method, since changing the order directly may result in an invalid curve.

◆ setup()

setup ( int  order,
int  num_knots 
)

Prepares a new curve definition with the indicated order and number of knots.

This also implies a particular number of vertices as well (the number of knots minus the order), but it is up to the user to add the correct number of vertices to the curve by repeatedly calling push_back().

Member Data Documentation

◆ closed

bool closed

Returns true if the curve appears to be closed.

Since the Egg syntax does not provide a means for explicit indication of closure, this has to be guessed at by examining the curve itself.

◆ degree

int degree

Returns the degree of the curve.

For a typical NURBS, the degree is 3.

◆ knots

double knots[]

◆ order

int order

Returns the order of the curve.

The order is the degree of the NURBS equation plus 1; for a typical NURBS, the order is 4. With this implementation of NURBS, the order must be in the range [1, 4].