NurbsSurfaceResult

from panda3d.core import NurbsSurfaceResult
class NurbsSurfaceResult

Bases: ReferenceCount

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.

Inheritance diagram

Inheritance diagram of NurbsSurfaceResult

__init__(param0: NurbsSurfaceResult)
evalExtendedPoint(u: float, v: float, d: int)float

Evaluates the surface in n-dimensional space according to the extended vertices associated with the surface in the indicated dimension.

evalExtendedPoints(u: float, v: float, d: int, result: PN_stdfloat_[], num_values: int)bool

Simultaneously performs evalExtendedPoint() 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.

evalNormal(u: float, v: float, normal: LVecBase3)bool

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 evalPoint().

evalPoint(u: float, v: float, point: LVecBase3)bool

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.

evalSegmentExtendedPoint(ui: int, vi: int, u: float, v: float, d: int)float

Evaluates the surface in n-dimensional space according to the extended vertices associated with the surface in the indicated dimension.

evalSegmentExtendedPoints(ui: int, vi: int, u: float, v: float, d: int, result: PN_stdfloat_[], num_values: int)None

Simultaneously performs evalExtendedPoint() 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(ui: int, vi: int, u: float, v: float, normal: LVecBase3)None

As evalSegmentPoint(), but computes the normal to the surface at the indicated point. The normal vector will not necessarily be normalized, and could be zero.

evalSegmentPoint(ui: int, vi: int, u: float, v: float, point: LVecBase3)None

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, evalPoint() is used to evaluate a point along the continuous surface, but when you care more about local continuity, you can use evalSegmentPoint() to evaluate the points along each segment.

getEndU()float

Returns the last legal value of u on the surface.

getEndV()float

Returns the last legal value of v on the surface.

getNumUSegments()int

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 evalSegmentPoint().

getNumVSegments()int

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 evalSegmentPoint().

getSegmentU(ui: int, u: float)float

Accepts a u value in the range [0, 1], and assumed to be relative to the indicated segment (as in evalSegmentPoint()), and returns the corresponding u value in the entire surface (as in evalPoint()).

getSegmentV(vi: int, v: float)float

Accepts a v value in the range [0, 1], and assumed to be relative to the indicated segment (as in evalSegmentPoint()), and returns the corresponding v value in the entire surface (as in evalPoint()).

getStartU()float

Returns the first legal value of u on the surface. Usually this is 0.0.

getStartV()float

Returns the first legal value of v on the surface. Usually this is 0.0.