Daniele Bariletti
81 lines
2.5 KiB
C++
81 lines
2.5 KiB
C++
//----------------------------------------------------------------------------
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// EgalTech 2024
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//----------------------------------------------------------------------------
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// File : SbzSphere.cpp Data : 14.02.2024 Versione : 2.6b2
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// Contenuto : Implementazione di funzioni per creazione di superfici Sbz
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// standard : Box, Pyramid, Cylinder, Sphere, Cone.
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//
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//
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// Modifiche : 14.02.2024 DB Creazione modulo.
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//
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//
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//----------------------------------------------------------------------------
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//--------------------------- Include ----------------------------------------
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#include "stdafx.h"
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#include "CurveArc.h"
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#include "SurfTriMesh.h"
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#include "SurfBezier.h"
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#include "/EgtDev/Include/EGkSbzStandard.h"
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using namespace std ;
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//-------------------------------------------------------------------------------
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ISurfBezier*
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CreateBezierSphere( const Point3d& ptCenter, double dR)
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{
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// creo una superficie di Bezier di grado 2 con 45 punti di controllo
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PtrOwner<ISurfBezier> pSrfBez( CreateSurfBezier()) ;
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int nDegU = 2 ;
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int nDegV = 2 ;
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int nSpanU = 4 ; // i poli della sfera sono a coordinate ( 0,0,-R) e ( 0,0,R)
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int nSpanV = 2 ;
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bool bRat = true ;
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double dW = SQRT2 ;
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pSrfBez->Init(nDegU, nDegV, nSpanU, nSpanV, bRat) ;
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// polo inferiore // dW = 1, dW = SQRT2 / 2
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for ( int i = 0 ; i < 9; ++i) {
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if ( i % 2 == 0)
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dW = 1 ;
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else
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dW = SQRT2 / 2 ;
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pSrfBez->SetControlPoint( i, 0, ptCenter + Point3d( 0, 0, -dR), dW) ;
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}
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// definisco la gabbia esterna // dW = SQRT2 / 2, dW = 1 / 2
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// parto dal punto ( 0,-dR, -dR) e completo riga per riga
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double dH = -dR ;
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for ( int j = 1 ; j < 4 ; ++j ) {
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Vector3d vtDir ( 0, -dR, 0) ;
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Point3d pt(-dR,-dR,dH) ;
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for ( int i = 0; i < 9 ; ++i ) {
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// ogni due punti ruoto di 90 gradi a sinistra
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if ( i%2 == 0) {
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vtDir.Rotate( Z_AX, 90) ;
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if ( j%2 == 1)
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dW = SQRT2 / 2 ;
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else
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dW = 1 ;
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}
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else {
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if ( j%2 == 1)
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dW = 1. / 2. ;
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else
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dW = SQRT2 / 2 ;
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}
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pt += vtDir ;
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pSrfBez->SetControlPoint( i, j, ptCenter + pt, dW) ;
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}
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dH += dR ;
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}
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// polo superiore // dW = 1, dW = SQRT2 / 2
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for ( int i = 0 ; i < 9; ++i) {
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if ( i % 2 == 0)
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dW = 1 ;
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else
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dW = SQRT2 / 2 ;
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pSrfBez->SetControlPoint( i, 4, ptCenter + Point3d( 0, 0, dR), dW) ;
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}
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return Release( pSrfBez) ;
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}
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