Panda3D
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A parametric NURBS curve. More...
#include <pandadoc.hpp>
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... | |
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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... | |
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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) | |
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object | __reduce__ () |
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) | |
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__init__ (const EggNamedObject copy) | |
__init__ (str name) | |
EggNamedObject | operator= (const EggNamedObject copy) |
output (Ostream out) | |
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__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... | |
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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... | |
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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... | |
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__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) | |
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__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... | |
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__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 () |
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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... | |
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static TypeHandle | getClassType () |
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static TypeHandle | getClassType () |
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static TypeHandle | getClassType () |
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static TypeHandle | getClassType () |
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static TypeHandle | getClassType () |
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static TypeHandle | getClassType () |
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static TypeHandle | getClassType () |
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static TypeHandle | getClassType () |
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static TypeHandle | getClassType () |
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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 [] |
Returns the nth knot value defined. More... | |
int | order |
Returns the order of the curve. More... | |
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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 [] |
Returns the first texture on the primitive, if any, or NULL if there are no textures on the primitive. More... | |
EggVertex | vertices [] |
Returns a particular index based on its index number. More... | |
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int | depth |
Returns the number of nodes above this node in the egg hierarchy. More... | |
EggGroupNode | parent |
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TypeHandle | type |
Returns the TypeHandle representing this object's type. More... | |
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int | ref_count |
The current reference count. More... | |
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const String | name |
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EggMorphNormalList | _dnormals |
EggMorphColorList | _drgbas |
Additional Inherited Members | |
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enum | CurveType { CT_none = 0 , CT_xyz = 1 , CT_hpr = 2 , CT_t = 3 } |
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enum | Shading { S_unknown = 0 , S_overall = 1 , S_per_face = 2 , S_per_vertex = 3 } |
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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 } |
A parametric NURBS curve.
__init__ | ( | const EggNurbsCurve | copy | ) |
__init__ | ( | str | name | ) |
|
static |
int getDegree | ( | ) |
Returns the degree of the curve.
For a typical NURBS, the degree is 3.
double getKnot | ( | int | k | ) |
Returns the nth knot value defined.
list getKnots | ( | ) |
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.)
int getNumKnots | ( | ) |
Returns the number of knots.
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].
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.
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.
EggNurbsCurve operator= | ( | const EggNurbsCurve | copy | ) |
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 | ( | 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 | ( | 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 | ( | 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().
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.
int degree |
Returns the degree of the curve.
For a typical NURBS, the degree is 3.
double knots[] |
Returns the nth knot value defined.
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].