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NL3D::CLandscape::CBezierPatchZ Struct Reference

Detailed Description

A Bezier patch of One value only. NB: unlike CBezierPatch, layout is inverted on Y. (NB: same formulas...)

Definition at line 824 of file landscape.h.

Public Member Functions

float eval (float s, float t) const
 Evaluate.

void makeInteriors ()
 make default Interiors, according to Vertices and Tangents.


Data Fields

float Interiors [4]
 The interiors, ia,ib,ic,id. NB: interiors are points, not vectors.

float Tangents [8]
 The tangents ab, ba, bc, cb, cd, dc, da, ad. NB: tangents are points, not vectors.

float Vertices [4]
 The vertices a,b,c,d of the quad patch.

Member Function Documentation

float NL3D::CLandscape::CBezierPatchZ::eval (  float  s,
float  t
)  const
 

Evaluate.

Definition at line 2743 of file landscape.cpp.

Referenced by NL3D::CLandscape::getHeightFieldDeltaZ(). 

02744 {
02745         float   p;
02746 
02747         float ps2 = ps * ps;
02748         float ps1 = 1.0f - ps;
02749         float ps12 = ps1 * ps1;
02750         float s0 = ps12 * ps1;
02751         float s1 = 3.0f * ps * ps12;
02752         float s2 = 3.0f * ps2 * ps1;
02753         float s3 = ps2 * ps;
02754         float pt2 = pt * pt;
02755         float pt1 = 1.0f - pt;
02756         float pt12 = pt1 * pt1;
02757         float t0 = pt12 * pt1;
02758         float t1 = 3.0f * pt * pt12;
02759         float t2 = 3.0f * pt2 * pt1;
02760         float t3 = pt2 * pt;
02761 
02762         p = Vertices[0] * s0 * t0       + 
02763                 Tangents[7] * s1 * t0   + 
02764                 Tangents[6] * s2 * t0   + 
02765                 Vertices[3] * s3 * t0;
02766         p+= Tangents[0] * s0 * t1       + 
02767                 Interiors[0]* s1 * t1   + 
02768                 Interiors[3]* s2 * t1   + 
02769                 Tangents[5] * s3 * t1;
02770         p+=     Tangents[1] * s0 * t2   + 
02771                 Interiors[1]* s1 * t2   + 
02772                 Interiors[2]* s2 * t2   + 
02773                 Tangents[4] * s3 * t2;
02774         p+=     Vertices[1] * s0 * t3   + 
02775                 Tangents[2] * s1 * t3   + 
02776                 Tangents[3] * s2 * t3   + 
02777                 Vertices[2] * s3 * t3;
02778         
02779         return p;
02780 }

void NL3D::CLandscape::CBezierPatchZ::makeInteriors (   ) 
 

make default Interiors, according to Vertices and Tangents.

Definition at line 2731 of file landscape.cpp.

Referenced by NL3D::CLandscape::setHeightField(). 

02732 {
02733         float           &a = Vertices[0];
02734         float           &b = Vertices[1];
02735         float           &c = Vertices[2];
02736         float           &d = Vertices[3];
02737         Interiors[0] = Tangents[7] + Tangents[0] - a;
02738         Interiors[1] = Tangents[1] + Tangents[2] - b;
02739         Interiors[2] = Tangents[3] + Tangents[4] - c;
02740         Interiors[3] = Tangents[5] + Tangents[6] - d;
02741 }

Field Documentation

float NL3D::CLandscape::CBezierPatchZ::Interiors[4]
 

The interiors, ia,ib,ic,id. NB: interiors are points, not vectors.

Definition at line 831 of file landscape.h.

float NL3D::CLandscape::CBezierPatchZ::Tangents[8]
 

The tangents ab, ba, bc, cb, cd, dc, da, ad. NB: tangents are points, not vectors.

Definition at line 829 of file landscape.h.

Referenced by NL3D::CLandscape::setHeightField().

float NL3D::CLandscape::CBezierPatchZ::Vertices[4]
 

The vertices a,b,c,d of the quad patch.

Definition at line 827 of file landscape.h.

Referenced by NL3D::CLandscape::setHeightField().

The documentation for this struct was generated from the following files:
Generated on Tue Mar 16 06:48:37 2004 for NeL by doxygen 1.3.6