Panda3D
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The result of a NurbsSurfaceEvaluator. More...
Public Member Functions | |
__init__ (const NurbsSurfaceResult) | |
float | evalExtendedPoint (float u, float v, int d) |
Evaluates the surface in n-dimensional space according to the extended vertices associated with the surface in the indicated dimension. More... | |
bool | evalExtendedPoints (float u, float v, int d, PNStdfloat[] result, int num_values) |
Simultaneously performs eval_extended_point on a contiguous sequence of dimensions. More... | |
bool | evalNormal (float u, float v, LVecBase3 normal) |
Computes the normal to the surface at the indicated point in parametric time. More... | |
bool | evalPoint (float u, float v, LVecBase3 point) |
Computes the point on the surface corresponding to the indicated value in parametric time. More... | |
float | evalSegmentExtendedPoint (int ui, int vi, float u, float v, int d) |
Evaluates the surface in n-dimensional space according to the extended vertices associated with the surface in the indicated dimension. More... | |
evalSegmentExtendedPoints (int ui, int vi, float u, float v, int d, PNStdfloat[] result, int num_values) | |
Simultaneously performs eval_extended_point on a contiguous sequence of dimensions. More... | |
evalSegmentNormal (int ui, int vi, float u, float v, LVecBase3 normal) | |
As eval_segment_point, but computes the normal to the surface at the indicated point. More... | |
evalSegmentPoint (int ui, int vi, float u, float v, LVecBase3 point) | |
Evaluates the point on the surface corresponding to the indicated value in parametric time within the indicated surface segment. More... | |
float | getEndU () |
Returns the last legal value of u on the surface. More... | |
float | getEndV () |
Returns the last legal value of v on the surface. More... | |
int | getNumUSegments () |
Returns the number of piecewise continuous segments within the surface in the U direction. More... | |
int | getNumVSegments () |
Returns the number of piecewise continuous segments within the surface in the V direction. More... | |
float | getSegmentU (int ui, float u) |
Accepts a u value in the range [0, 1], and assumed to be relative to the indicated segment (as in eval_segment_point()), and returns the corresponding u value in the entire surface (as in eval_point()). More... | |
float | getSegmentV (int vi, float v) |
Accepts a v value in the range [0, 1], and assumed to be relative to the indicated segment (as in eval_segment_point()), and returns the corresponding v value in the entire surface (as in eval_point()). More... | |
float | getStartU () |
Returns the first legal value of u on the surface. More... | |
float | getStartV () |
Returns the first legal value of v on the surface. 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... | |
Additional Inherited Members | |
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static TypeHandle | getClassType () |
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int | ref_count |
The current reference count. More... | |
The result of a NurbsSurfaceEvaluator.
This object represents a surface in a particular coordinate space. It can return the point and/or normal to the surface at any point.
__init__ | ( | const | NurbsSurfaceResult | ) |
float evalExtendedPoint | ( | float | u, |
float | v, | ||
int | d | ||
) |
Evaluates the surface in n-dimensional space according to the extended vertices associated with the surface in the indicated dimension.
bool evalExtendedPoints | ( | float | u, |
float | v, | ||
int | d, | ||
PNStdfloat[] | result, | ||
int | num_values | ||
) |
Simultaneously performs eval_extended_point on a contiguous sequence of dimensions.
The dimensions evaluated are d through (d + num_values - 1); the results are filled into the num_values elements in the indicated result array.
bool evalNormal | ( | float | u, |
float | v, | ||
LVecBase3 | normal | ||
) |
Computes the normal to the surface at the indicated point in parametric time.
This normal vector will not necessarily be normalized, and could be zero. See also eval_point().
bool evalPoint | ( | float | u, |
float | v, | ||
LVecBase3 | point | ||
) |
Computes the point on the surface corresponding to the indicated value in parametric time.
Returns true if the u, v values are valid, false otherwise.
float evalSegmentExtendedPoint | ( | int | ui, |
int | vi, | ||
float | u, | ||
float | v, | ||
int | d | ||
) |
Evaluates the surface in n-dimensional space according to the extended vertices associated with the surface in the indicated dimension.
evalSegmentExtendedPoints | ( | int | ui, |
int | vi, | ||
float | u, | ||
float | v, | ||
int | d, | ||
PNStdfloat[] | result, | ||
int | num_values | ||
) |
Simultaneously performs eval_extended_point on a contiguous sequence of dimensions.
The dimensions evaluated are d through (d + num_values - 1); the results are filled into the num_values elements in the indicated result array.
evalSegmentNormal | ( | int | ui, |
int | vi, | ||
float | u, | ||
float | v, | ||
LVecBase3 | normal | ||
) |
As eval_segment_point, but computes the normal to the surface at the indicated point.
The normal vector will not necessarily be normalized, and could be zero.
evalSegmentPoint | ( | int | ui, |
int | vi, | ||
float | u, | ||
float | v, | ||
LVecBase3 | point | ||
) |
Evaluates the point on the surface corresponding to the indicated value in parametric time within the indicated surface segment.
u and v should be in the range [0, 1].
The surface is internally represented as a number of connected (or possibly unconnected) piecewise continuous segments. The exact number of segments for a particular surface depends on the knot vector, and is returned by get_num_segments(). Normally, eval_point() is used to evaluate a point along the continuous surface, but when you care more about local continuity, you can use eval_segment_point() to evaluate the points along each segment.
float getEndU | ( | ) |
Returns the last legal value of u on the surface.
float getEndV | ( | ) |
Returns the last legal value of v on the surface.
int getNumUSegments | ( | ) |
Returns the number of piecewise continuous segments within the surface in the U direction.
This number is usually not important unless you plan to call eval_segment_point().
int getNumVSegments | ( | ) |
Returns the number of piecewise continuous segments within the surface in the V direction.
This number is usually not important unless you plan to call eval_segment_point().
float getSegmentU | ( | int | ui, |
float | u | ||
) |
Accepts a u value in the range [0, 1], and assumed to be relative to the indicated segment (as in eval_segment_point()), and returns the corresponding u value in the entire surface (as in eval_point()).
float getSegmentV | ( | int | vi, |
float | v | ||
) |
Accepts a v value in the range [0, 1], and assumed to be relative to the indicated segment (as in eval_segment_point()), and returns the corresponding v value in the entire surface (as in eval_point()).
float getStartU | ( | ) |
Returns the first legal value of u on the surface.
Usually this is 0.0.
float getStartV | ( | ) |
Returns the first legal value of v on the surface.
Usually this is 0.0.