Actual source code: plexextrude.c
1: #include <petsc/private/dmpleximpl.h>
2: #include <petscdmplextransform.h>
4: /*@
5: DMPlexExtrude - Extrude a volumetric mesh from the input surface mesh
7: Input Parameters:
8: + dm - The surface mesh
9: . layers - The number of extruded layers
10: . thickness - The total thickness of the extruded layers, or `PETSC_DETERMINE`
11: . tensor - Flag to create tensor produt cells
12: . symmetric - Flag to extrude symmetrically about the surface
13: . periodic - Flag to extrude periodically
14: . normal - Surface normal vector, or `NULL`
15: - thicknesses - Thickness of each layer, or `NULL`
17: Output Parameter:
18: . edm - The volumetric mesh
20: Options Database Keys:
21: + -dm_plex_transform_extrude_thickness <t> - The total thickness of extruded layers
22: . -dm_plex_transform_extrude_use_tensor <bool> - Use tensor cells when extruding
23: . -dm_plex_transform_extrude_symmetric <bool> - Extrude layers symmetrically about the surface
24: . -dm_plex_transform_extrude_periodic <bool> - Extrude layers periodically
25: . -dm_plex_transform_extrude_normal <n0,...,nd> - Specify the extrusion direction
26: - -dm_plex_transform_extrude_thicknesses <t0,...,tl> - Specify thickness of each layer
28: Level: intermediate
30: Notes:
31: Extrusion is implemented as a `DMPlexTransform`, so that new mesh points are produced from old mesh points. In the example below,
32: we begin with an edge (v0, v3). It is extruded for two layers. The original vertex v0 produces two edges, e1 and e2, and three vertices,
33: v0, v2, and v2. Similarly, vertex v3 produces e3, e4, v3, v4, and v5. The original edge produces itself, e5 and e6, as well as face1 and
34: face2. The new mesh points are given the same labels as the original points which produced them. Thus, if v0 had a label value 1, then so
35: would v1, v2, e1 and e2.
37: .vb
38: v2----- e6 -----v5
39: | |
40: e2 face2 e4
41: | |
42: v1----- e5 -----v4
43: | |
44: e1 face1 e3
45: | |
46: v0--- original ----v3
47: .ve
49: .seealso: [](ch_unstructured), `DM`, `DMPLEX`, `DMExtrude()`, `DMPlexTransform`, `DMPlexTransformExtrudeSetThickness()`, `DMPlexTransformExtrudeSetTensor()`
50: @*/
51: PetscErrorCode DMPlexExtrude(DM dm, PetscInt layers, PetscReal thickness, PetscBool tensor, PetscBool symmetric, PetscBool periodic, const PetscReal normal[], const PetscReal thicknesses[], DM *edm)
52: {
53: DMPlexTransform tr;
54: DM cdm;
55: PetscObject disc;
56: PetscClassId id;
57: const char *prefix;
58: PetscOptions options;
59: PetscBool cutMarker = PETSC_FALSE;
61: PetscFunctionBegin;
62: PetscCall(DMPlexTransformCreate(PetscObjectComm((PetscObject)dm), &tr));
63: PetscCall(PetscObjectSetName((PetscObject)tr, "Extrusion Transform"));
64: PetscCall(DMPlexTransformSetDM(tr, dm));
65: PetscCall(DMPlexTransformSetType(tr, DMPLEXEXTRUDE));
66: PetscCall(PetscObjectGetOptionsPrefix((PetscObject)dm, &prefix));
67: PetscCall(PetscObjectSetOptionsPrefix((PetscObject)tr, prefix));
68: PetscCall(PetscObjectGetOptions((PetscObject)dm, &options));
69: PetscCall(PetscObjectSetOptions((PetscObject)tr, options));
70: PetscCall(DMPlexTransformExtrudeSetLayers(tr, layers));
71: if (thickness > 0.) PetscCall(DMPlexTransformExtrudeSetThickness(tr, thickness));
72: PetscCall(DMPlexTransformExtrudeSetTensor(tr, tensor));
73: PetscCall(DMPlexTransformExtrudeSetSymmetric(tr, symmetric));
74: PetscCall(DMPlexTransformExtrudeSetPeriodic(tr, periodic));
75: if (normal) PetscCall(DMPlexTransformExtrudeSetNormal(tr, normal));
76: if (thicknesses) PetscCall(DMPlexTransformExtrudeSetThicknesses(tr, layers, thicknesses));
77: PetscCall(DMPlexTransformSetFromOptions(tr));
78: PetscCall(PetscObjectSetOptions((PetscObject)tr, NULL));
79: PetscCall(DMPlexTransformSetUp(tr));
80: PetscCall(PetscObjectViewFromOptions((PetscObject)tr, NULL, "-dm_plex_transform_view"));
81: PetscCall(DMPlexTransformApply(tr, dm, edm));
82: PetscCall(DMCopyDisc(dm, *edm));
83: // Handle periodic viewing
84: PetscCall(PetscOptionsGetBool(options, ((PetscObject)dm)->prefix, "-dm_plex_periodic_cut", &cutMarker, NULL));
85: PetscCall(DMPlexTransformExtrudeGetPeriodic(tr, &periodic));
86: if (periodic && cutMarker) {
87: DMLabel cutLabel;
88: PetscInt dim, pStart, pEnd;
90: PetscCall(DMGetDimension(dm, &dim));
91: PetscCall(DMCreateLabel(*edm, "periodic_cut"));
92: PetscCall(DMGetLabel(*edm, "periodic_cut", &cutLabel));
93: PetscCall(DMPlexGetChart(dm, &pStart, &pEnd));
94: for (PetscInt p = pStart; p < pEnd; ++p) {
95: DMPolytopeType ct;
96: DMPolytopeType *rct;
97: PetscInt *rsize, *rcone, *rornt;
98: PetscInt Nct;
100: PetscCall(DMPlexGetCellType(dm, p, &ct));
101: PetscCall(DMPlexTransformCellTransform(tr, ct, p, NULL, &Nct, &rct, &rsize, &rcone, &rornt));
102: for (PetscInt n = 0; n < Nct; ++n) {
103: PetscInt pNew, pdim = DMPolytopeTypeGetDim(rct[n]);
105: if (ct == rct[n] || pdim > dim) {
106: PetscCall(DMPlexTransformGetTargetPoint(tr, ct, rct[n], p, 0, &pNew));
107: PetscCall(DMLabelSetValue(cutLabel, pNew, !pdim ? 1 : 2));
108: }
109: }
110: }
111: }
112: // It is too hard to raise the dimension of a discretization, so just remake it
113: PetscCall(DMGetCoordinateDM(dm, &cdm));
114: PetscCall(DMGetField(cdm, 0, NULL, &disc));
115: PetscCall(PetscObjectGetClassId(disc, &id));
116: if (id == PETSCFE_CLASSID) {
117: PetscSpace sp;
118: PetscInt deg;
120: PetscCall(PetscFEGetBasisSpace((PetscFE)disc, &sp));
121: PetscCall(PetscSpaceGetDegree(sp, °, NULL));
122: PetscCall(DMPlexCreateCoordinateSpace(*edm, deg, PETSC_TRUE, NULL));
123: }
124: PetscCall(DMPlexTransformCreateDiscLabels(tr, *edm));
125: PetscCall(DMPlexTransformDestroy(&tr));
126: PetscCall(DMPlexCopy_Internal(dm, PETSC_FALSE, PETSC_FALSE, *edm));
127: PetscFunctionReturn(PETSC_SUCCESS);
128: }
130: PetscErrorCode DMExtrude_Plex(DM dm, PetscInt layers, DM *edm)
131: {
132: PetscFunctionBegin;
133: PetscCall(DMPlexExtrude(dm, layers, PETSC_DETERMINE, PETSC_TRUE, PETSC_FALSE, PETSC_FALSE, NULL, NULL, edm));
134: PetscCall(DMSetMatType(*edm, dm->mattype));
135: PetscCall(DMViewFromOptions(*edm, NULL, "-check_extrude"));
136: PetscFunctionReturn(PETSC_SUCCESS);
137: }