private static int MakeTrimmingLoop(ref OnBrep brep, // returns index of loop
ref OnBrepFace face, // face loop is on
int v0, int v1, int v2, // Indices of corner vertices listed in A,B,C order
int e0, // index of first edge
int e0_dir, // orientation of edge
int e1, // index second edgee
int e1_dir, // orientation of edge
int e2, // index third edge
int e2_dir // orientation of edge
)
{
OnSurface srf = brep.m_S[face.m_si];
//Create new loop
OnBrepLoop loop = brep.NewLoop(IOnBrepLoop.TYPE.outer, ref face);
// Create trimming curves running counter clockwise around the surface's domain.
// Note that trims of outer loops run counter clockwise while trims of inner loops (holes) run anti-clockwise.
// Also note that when trims locate on surface N,S,E or W ends, then trim_iso becomes N_iso, S_iso, E_iso and W_iso respectfully.
// While if trim is parallel to surface N,S or E,W, then trim is becomes y_iso and x_iso respectfully.
// Start at the south side
OnCurve c2;
int c2i, ei = 0;
bool bRev3d = false;
IOnSurface.ISO iso = IOnSurface.ISO.not_iso;
for (int side = 0; side < 3; side++)
{
// side: 0=south, 1=east, 2=north, 3=west
c2 = CreateTrimmingCurve(srf, side);
//Add trimming curve to brep trmming curves array
c2i = brep.m_C2.Count();
brep.m_C2.Append(c2);
switch (side)
{
case 0: // south
ei = e0;
bRev3d = (e0_dir == -1);
iso = IOnSurface.ISO.S_iso;
break;
case 1: // diagonal
ei = e1;
bRev3d = (e1_dir == -1);
iso = IOnSurface.ISO.not_iso;
break;
case 2: // diagonal
ei = e2;
bRev3d = (e2_dir == -1);
iso = IOnSurface.ISO.not_iso;
break;
}
//Create new trim topology that references edge, direction reletive to edge, loop and trim curve geometry
OnBrepEdge edge = brep.m_E[ei];
OnBrepTrim trim = brep.NewTrim(ref edge, bRev3d, ref loop, c2i);
if (trim != null)
{
trim.m_iso = iso;
trim.m_type = IOnBrepTrim.TYPE.boundary; // This one b-rep face, so all trims are boundary ones.
trim.set_m_tolerance(0, 0.0); // This simple example is exact - for models with non-exact
trim.set_m_tolerance(1, 0.0); // data, set tolerance as explained in definition of ON_BrepTrim.
}
}
return(loop.m_loop_index);
}
/// <summary>
/// MakeTwistedCubeTrimmingLoop
/// </summary>
static int MakeTwistedCubeTrimmingLoop(
ref OnBrep brep, // returns index of loop
ref OnBrepFace face, // face loop is on
int vSWi, int vSEi, int vNEi, int vNWi, // Indices of corner vertices listed in SW, SE, NW, NE order
int eSi, // index of edge on south side of surface
int eS_dir, // orientation of edge with respect to surface trim
int eEi, // index of edge on south side of surface
int eE_dir, // orientation of edge with respect to surface trim
int eNi, // index of edge on south side of surface
int eN_dir, // orientation of edge with respect to surface trim
int eWi, // index of edge on south side of surface
int eW_dir // orientation of edge with respect to surface trim
)
{
IOnSurface srf = brep.m_S[face.m_si];
OnBrepLoop loop = brep.NewLoop(IOnBrepLoop.TYPE.outer, ref face);
// Create trimming curves running counter clockwise around the surface's domain.
// Start at the south side
int c2i = 0, ei = 0;
bool bRev3d = false;
IOnSurface.ISO iso = IOnSurface.ISO.not_iso;
for (int side = 0; side < 4; side++)
{
// side: 0=south, 1=east, 2=north, 3=west
OnCurve c2 = TwistedCubeTrimmingCurve(srf, side);
c2i = brep.m_C2.Count();
brep.m_C2.Append(c2);
switch (side)
{
case 0: // south
ei = eSi;
bRev3d = (eS_dir == -1);
iso = IOnSurface.ISO.S_iso;
break;
case 1: // east
ei = eEi;
bRev3d = (eE_dir == -1);
iso = IOnSurface.ISO.E_iso;
break;
case 2: // north
ei = eNi;
bRev3d = (eN_dir == -1);
iso = IOnSurface.ISO.N_iso;
break;
case 3: // west
ei = eWi;
bRev3d = (eW_dir == -1);
iso = IOnSurface.ISO.W_iso;
break;
}
OnBrepEdge edge = brep.m_E[ei];
OnBrepTrim trim = brep.NewTrim(ref edge, bRev3d, ref loop, c2i);
trim.m_iso = iso;
trim.m_type = IOnBrepTrim.TYPE.mated; // This b-rep is closed, so all trims have mates.
trim.set_m_tolerance(0, 0.0); // This simple example is exact - for models with
trim.set_m_tolerance(1, 0.0); // non-exact data, set tolerance as explained in
// definition of OnBrepTrim.
}
return(loop.m_loop_index);
}
private static int MakeInnerTrimmingLoop(ref OnBrep brep, // returns index of loop
ref OnBrepFace face, // face loop is on
int vSWi, int vSEi, int vNEi, int vNWi, // Indices of hole vertices
int eSi, // index of edge close to south side of surface
int eS_dir, // orientation of edge with respect to surface trim
int eEi, // index of edge close to east side of surface
int eE_dir, // orientation of edge with respect to surface trim
int eNi, // index of edge close to north side of surface
int eN_dir, // orientation of edge with respect to surface trim
int eWi, // index of edge close to west side of surface
int eW_dir // orientation of edge with respect to surface trim
)
{
OnSurface srf = brep.m_S[face.m_si];
//Create new inner loop
OnBrepLoop loop = brep.NewLoop(IOnBrepLoop.TYPE.inner, ref face);
// Create trimming curves running counter clockwise around the surface's domain.
// Note that trims of outer loops run counter clockwise while trims of inner loops (holes) run clockwise.
// Also note that when trims locate on surface N,S,E or W ends, then trim_iso becomes N_iso, S_iso, E_iso and W_iso respectfully.
// While if trim is parallel to surface N,S or E,W, then trim iso becomes y_iso and x_iso respectfully.
// All other cases, iso is set to not_iso
// Start near the south side
OnCurve c2;
int c2i, ei = 0;
bool bRev3d = false;
IOnSurface.ISO iso = IOnSurface.ISO.not_iso;
for (int side = 0; side < 4; side++)
{
// side: 0=near south(y_iso), 1=near west(x_iso), 2=near north(y_iso), 3=near east(x_iso)
//Create trim 2d curve
c2 = CreateInnerTrimmingCurve(srf, side);
//Add trimming curve to brep trmming curves array
c2i = brep.m_C2.Count();
brep.m_C2.Append(c2);
switch (side)
{
case 0: // near south
ei = eSi;
bRev3d = (eS_dir == -1);
iso = IOnSurface.ISO.y_iso;
break;
case 1: // near west
ei = eEi;
bRev3d = (eE_dir == -1);
iso = IOnSurface.ISO.x_iso;
break;
case 2: // near north
ei = eNi;
bRev3d = (eN_dir == -1);
iso = IOnSurface.ISO.y_iso;
break;
case 3: // near east
ei = eWi;
bRev3d = (eW_dir == -1);
iso = IOnSurface.ISO.x_iso;
break;
}
//Create new trim topology that references edge, direction reletive to edge, loop and trim curve geometry
OnBrepEdge edge = brep.m_E[ei];
OnBrepTrim trim = brep.NewTrim(ref edge, bRev3d, ref loop, c2i);
if (trim != null)
{
trim.m_iso = iso;
trim.m_type = IOnBrepTrim.TYPE.boundary; // This one b-rep face, so all trims are boundary ones.
trim.set_m_tolerance(0, 0.0); // This simple example is exact - for models with non-exact
trim.set_m_tolerance(1, 0.0); // data, set tolerance as explained in definition of ON_BrepTrim.
}
}
return(loop.m_loop_index);
}
