ON_Brep*
MakeTwistedCube(ON_TextLog& error_log)
{
ON_3dPoint point[8] = {
ON_3dPoint( 0.0, 0.0, 11.0), // Point A
ON_3dPoint(10.0, 0.0, 12.0), // Point B
ON_3dPoint(10.0, 8.0, 13.0), // Point C
ON_3dPoint( 0.0, 6.0, 12.0), // Point D
ON_3dPoint( 1.0, 2.0, 0.0), // Point E
ON_3dPoint(10.0, 0.0, 0.0), // Point F
ON_3dPoint(10.0, 7.0, -1.0), // Point G
ON_3dPoint( 0.0, 6.0, 0.0), // Point H
};
ON_Brep* brep = new ON_Brep();
// create eight vertices located at the eight points
for (int i = 0; i < 8; i++) {
ON_BrepVertex& v = brep->NewVertex(point[i]);
v.m_tolerance = 0.0;
// this example uses exact tolerance... reference
// ON_BrepVertex for definition of non-exact data
}
// create 3d curve geometry - the orientations are arbitrarily
// chosen so that the end vertices are in alphabetical order
brep->m_C3.Append(TwistedCubeEdgeCurve(point[A], point[B])); // AB
brep->m_C3.Append(TwistedCubeEdgeCurve(point[B], point[C])); // BC
brep->m_C3.Append(TwistedCubeEdgeCurve(point[C], point[D])); // CD
brep->m_C3.Append(TwistedCubeEdgeCurve(point[A], point[D])); // AD
brep->m_C3.Append(TwistedCubeEdgeCurve(point[E], point[F])); // EF
brep->m_C3.Append(TwistedCubeEdgeCurve(point[F], point[G])); // FG
brep->m_C3.Append(TwistedCubeEdgeCurve(point[G], point[H])); // GH
brep->m_C3.Append(TwistedCubeEdgeCurve(point[E], point[H])); // EH
brep->m_C3.Append(TwistedCubeEdgeCurve(point[A], point[E])); // AE
brep->m_C3.Append(TwistedCubeEdgeCurve(point[B], point[F])); // BF
brep->m_C3.Append(TwistedCubeEdgeCurve(point[C], point[G])); // CG
brep->m_C3.Append(TwistedCubeEdgeCurve(point[D], point[H])); // DH
// create the 12 edges the connect the corners
MakeTwistedCubeEdges( *brep );
// create the 3d surface geometry. the orientations are arbitrary so
// some normals point into the cube and other point out... not sure why
brep->m_S.Append(TwistedCubeSideSurface(point[A], point[B], point[C], point[D]));
brep->m_S.Append(TwistedCubeSideSurface(point[B], point[F], point[G], point[C]));
brep->m_S.Append(TwistedCubeSideSurface(point[F], point[E], point[H], point[G]));
brep->m_S.Append(TwistedCubeSideSurface(point[E], point[A], point[D], point[H]));
brep->m_S.Append(TwistedCubeSideSurface(point[E], point[F], point[B], point[A]));
brep->m_S.Append(TwistedCubeSideSurface(point[D], point[C], point[G], point[H]));
// create the faces
MakeTwistedCubeFaces(*brep);
if (!brep->IsValid()) {
error_log.Print("Twisted cube b-rep is not valid!\n");
delete brep;
brep = NULL;
}
return brep;
}
static ON_Brep* MakeTwistedCube( ON_TextLog& error_log )
{
// This example demonstrates how to construct a ON_Brep
// with the topology shown below.
//
//
// H-------e6-------G
// / /|
// / | / |
// / e7 / e5
// / | / |
// / e10 |
// / | / |
// e11 E- - e4- -/- - - F
// / / /
// / / / /
// D---------e2-----C e9
// | / | /
// | e8 | /
// e3 / e1 /
// | | /
// | / | /
// | |/
// A-------e0-------B
//
//
ON_3dPoint point[8] = {
ON_3dPoint( 0.0, 0.0, 0.0 ), // point A = geometry for vertex 0
ON_3dPoint( 10.0, 0.0, 0.0 ), // point B = geometry for vertex 1
ON_3dPoint( 10.0, 8.0, -1.0 ), // point C = geometry for vertex 2
ON_3dPoint( 0.0, 6.0, 0.0 ), // point D = geometry for vertex 3
ON_3dPoint( 1.0, 2.0, 11.0 ), // point E = geometry for vertex 4
ON_3dPoint( 10.0, 0.0, 12.0 ), // point F = geometry for vertex 5
ON_3dPoint( 10.0, 7.0, 13.0 ), // point G = geometry for vertex 6
ON_3dPoint( 0.0, 6.0, 12.0 ) // point H = geometry for vertex 7
};
ON_Brep* brep = new ON_Brep();
// create eight vertices located at the eight points
int vi;
for ( vi = 0; vi < 8; vi++ ) {
ON_BrepVertex& v = brep->NewVertex(point[vi]);
v.m_tolerance = 0.0; // this simple example is exact - for models with
// non-exact data, set tolerance as explained in
// definition of ON_BrepVertex.
}
// Create 3d curve geometry - the orientations are arbitrarily chosen
// so that the end vertices are in alphabetical order.
brep->m_C3.Append( TwistedCubeEdgeCurve( point[A], point[B] ) ); // line AB
brep->m_C3.Append( TwistedCubeEdgeCurve( point[B], point[C] ) ); // line BC
brep->m_C3.Append( TwistedCubeEdgeCurve( point[C], point[D] ) ); // line CD
brep->m_C3.Append( TwistedCubeEdgeCurve( point[A], point[D] ) ); // line AD
brep->m_C3.Append( TwistedCubeEdgeCurve( point[E], point[F] ) ); // line EF
brep->m_C3.Append( TwistedCubeEdgeCurve( point[F], point[G] ) ); // line FG
brep->m_C3.Append( TwistedCubeEdgeCurve( point[G], point[H] ) ); // line GH
brep->m_C3.Append( TwistedCubeEdgeCurve( point[E], point[H] ) ); // line EH
brep->m_C3.Append( TwistedCubeEdgeCurve( point[A], point[E] ) ); // line AE
brep->m_C3.Append( TwistedCubeEdgeCurve( point[B], point[F] ) ); // line BF
brep->m_C3.Append( TwistedCubeEdgeCurve( point[C], point[G] ) ); // line CG
brep->m_C3.Append( TwistedCubeEdgeCurve( point[D], point[H] ) ); // line DH
// Create the 12 edges that connect the corners of the cube.
MakeTwistedCubeEdges( *brep );
// Create 3d surface geometry - the orientations are arbitrarily chosen so
// that some normals point into the cube and others point out of the cube.
brep->m_S.Append( TwistedCubeSideSurface( point[A], point[B], point[C], point[D] ) ); // ABCD
brep->m_S.Append( TwistedCubeSideSurface( point[B], point[C], point[G], point[F] ) ); // BCGF
brep->m_S.Append( TwistedCubeSideSurface( point[C], point[D], point[H], point[G] ) ); // CDHG
brep->m_S.Append( TwistedCubeSideSurface( point[A], point[D], point[H], point[E] ) ); // ADHE
brep->m_S.Append( TwistedCubeSideSurface( point[A], point[B], point[F], point[E] ) ); // ABFE
brep->m_S.Append( TwistedCubeSideSurface( point[E], point[F], point[G], point[H] ) ); // EFGH
// Create the CRhinoBrepFaces
MakeTwistedCubeFaces( *brep );
if ( !brep->IsValid() )
{
error_log.Print("Twisted cube b-rep is not valid.\n");
delete brep;
brep = NULL;
}
//ON_BOOL32 bIsManifold;
//ON_BOOL32 bHasBoundary;
//ON_BOOL32 b = brep->IsManifold( &bIsManifold,&bHasBoundary );
return brep;
}
