Exemplo n.º 1
0
    def _from_igakit(self, inurbs):
        cs = iga.compute_bezier_extraction(inurbs.knots, inurbs.degree)
        n_els = [len(ii) for ii in cs]
        conn, bconn = iga.create_connectivity(n_els, inurbs.knots,
                                              inurbs.degree)

        cps = inurbs.points[..., :self.dim].copy()
        cps = cps.reshape((-1, self.dim))

        return NurbsPatch(inurbs.knots, inurbs.degree, cps,
                          inurbs.weights.ravel(), cs, conn)
Exemplo n.º 2
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    def _from_igakit(self, inurbs):
        cs = iga.compute_bezier_extraction(inurbs.knots, inurbs.degree)
        n_els = [len(ii) for ii in cs]
        conn, bconn = iga.create_connectivity(n_els, inurbs.knots,
                                              inurbs.degree)

        cps = inurbs.points[..., :self.dim].copy()
        cps = cps.reshape((-1, self.dim))

        return NurbsPatch(inurbs.knots, inurbs.degree, cps,
                          inurbs.weights.ravel(), cs, conn)
Exemplo n.º 3
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def create_from_igakit(inurbs, verbose=False):
    """
    Create :class:`IGDomain <sfepy.discrete.iga.domain.IGDomain>` data from a
    given igakit NURBS object.

    Parameters
    ----------
    inurbs : igakit.nurbs.NURBS instance
        The igakit NURBS object.

    Returns
    -------
    nurbs : NurbsPatch instance
        The NURBS data. The igakit NURBS object is stored as `nurbs` attribute.
    bmesh : Struct instance
        The Bezier mesh data.
    regions : dict
        The patch surface regions.
    """
    # Compute Bezier extraction data.
    output('computing Bezier mesh...', verbose=verbose)
    cs = iga.compute_bezier_extraction(inurbs.knots, inurbs.degree)
    n_els = [len(ii) for ii in cs]
    conn, bconn = iga.create_connectivity(n_els, inurbs.knots, inurbs.degree)

    ccs = iga.combine_bezier_extraction(cs)

    dim = len(inurbs.shape)
    cps = inurbs.points[..., :dim].copy()
    cps = cps.reshape((-1, dim))
    bcps, bweights = iga.compute_bezier_control(cps, inurbs.weights.ravel(),
                                                ccs, conn, bconn)

    nurbs = NurbsPatch(inurbs.knots, inurbs.degree, cps,
                       inurbs.weights.ravel(), cs, conn)
    nurbs.nurbs = inurbs
    bmesh = Struct(name='bmesh', cps=bcps, weights=bweights, conn=bconn)
    output('...done', verbose=verbose)

    output('defining regions...', verbose=verbose)
    regions = iga.get_patch_box_regions(n_els, inurbs.degree)
    output('...done', verbose=verbose)

    return nurbs, bmesh, regions
Exemplo n.º 4
0
def create_from_igakit(inurbs, verbose=False):
    """
    Create :class:`IGDomain <sfepy.discrete.iga.domain.IGDomain>` data from a
    given igakit NURBS object.

    Parameters
    ----------
    inurbs : igakit.nurbs.NURBS instance
        The igakit NURBS object.

    Returns
    -------
    nurbs : NurbsPatch instance
        The NURBS data. The igakit NURBS object is stored as `nurbs` attribute.
    bmesh : Struct instance
        The Bezier mesh data.
    regions : dict
        The patch surface regions.
    """
    # Compute Bezier extraction data.
    output('computing Bezier mesh...', verbose=verbose)
    cs = iga.compute_bezier_extraction(inurbs.knots, inurbs.degree)
    n_els = [len(ii) for ii in cs]
    conn, bconn = iga.create_connectivity(n_els, inurbs.knots, inurbs.degree)

    ccs = iga.combine_bezier_extraction(cs)

    dim = len(inurbs.shape)
    cps = inurbs.points[..., :dim].copy()
    cps = cps.reshape((-1, dim))
    bcps, bweights = iga.compute_bezier_control(cps, inurbs.weights.ravel(),
                                                ccs, conn, bconn)

    nurbs = NurbsPatch(inurbs.knots, inurbs.degree, cps,
                       inurbs.weights.ravel(), cs, conn)
    nurbs.nurbs = inurbs
    bmesh = Struct(name='bmesh', cps=bcps, weights=bweights, conn=bconn)
    output('...done', verbose=verbose)

    output('defining regions...', verbose=verbose)
    regions = iga.get_patch_box_regions(n_els, inurbs.degree)
    output('...done', verbose=verbose)

    return nurbs, bmesh, regions
Exemplo n.º 5
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def main():
    parser = OptionParser(usage=usage, version='%prog')
    parser.add_option('-o',
                      '',
                      metavar='filename',
                      action='store',
                      dest='filename',
                      default=None,
                      help=helps['filename'])
    parser.add_option('-d',
                      '--dims',
                      metavar='dims',
                      action='store',
                      dest='dims',
                      default='[1.0, 1.0, 1.0]',
                      help=helps['dims'])
    parser.add_option('-c',
                      '--centre',
                      metavar='centre',
                      action='store',
                      dest='centre',
                      default='[0.0, 0.0, 0.0]',
                      help=helps['centre'])
    parser.add_option('-s',
                      '--shape',
                      metavar='shape',
                      action='store',
                      dest='shape',
                      default='[5, 5, 5]',
                      help=helps['shape'])
    parser.add_option('',
                      '--degrees',
                      metavar='degrees',
                      action='store',
                      dest='degrees',
                      default='[2, 2, 2]',
                      help=helps['degrees'])
    parser.add_option('',
                      '--continuity',
                      metavar='continuity',
                      action='store',
                      dest='continuity',
                      default=None,
                      help=helps['continuity'])
    parser.add_option('-2',
                      '--2d',
                      action='store_true',
                      dest='is_2d',
                      default=False,
                      help=helps['2d'])
    parser.add_option('-p',
                      '--plot',
                      action='store_true',
                      dest='plot',
                      default=False,
                      help=helps['plot'])
    parser.add_option('-l',
                      '--label',
                      action='store_true',
                      dest='label',
                      default=False,
                      help=helps['label'])
    (options, args) = parser.parse_args()

    dim = 2 if options.is_2d else 3

    filename = options.filename
    if filename is None:
        filename = 'block%dd.iga' % dim

    dims = nm.array(eval(options.dims), dtype=nm.float64)[:dim]
    centre = nm.array(eval(options.centre), dtype=nm.float64)[:dim]
    shape = nm.array(eval(options.shape), dtype=nm.int32)[:dim]
    degrees = nm.array(eval(options.degrees), dtype=nm.int32)[:dim]

    if options.continuity is None:
        continuity = degrees - 1

    else:
        continuity = nm.array(eval(options.continuity), dtype=nm.int32)[:dim]

    output('dimensions:', dims)
    output('centre:    ', centre)
    output('shape:     ', shape)
    output('degrees:   ', degrees)
    output('continuity:', continuity)
    output('->        :', filename)

    dd = centre - 0.5 * dims
    block = cad.grid(shape - 1, degree=degrees, continuity=continuity)

    for ia in xrange(dim):
        block.scale(dims[ia], ia)

    for ia in xrange(dim):
        block.translate(dd[ia], ia)

    # Force uniform control points. This prevents coarser resolution inside the
    # block.
    shape = nm.asarray(block.points.shape[:-1])
    n_nod = nm.prod(shape)
    x0 = centre - 0.5 * dims
    dd = dims / (shape - 1)

    ngrid = nm.mgrid[[slice(ii) for ii in shape]]
    ngrid.shape = (dim, n_nod)

    coors = x0 + ngrid.T * dd
    coors.shape = shape.tolist() + [dim]

    block.array[..., :dim] = coors

    # Compute Bezier extraction data.
    cs = iga.compute_bezier_extraction(block.knots, block.degree)
    n_els = [len(ii) for ii in cs]
    conn, bconn = iga.create_connectivity(n_els, block.knots, block.degree)

    ccs = iga.combine_bezier_extraction(cs)

    cps = block.points[..., :dim].copy()
    cps = cps.reshape((-1, dim))
    bcps, bweights = iga.compute_bezier_control(cps, block.weights.ravel(),
                                                ccs, conn, bconn)

    regions = iga.get_patch_box_regions(n_els, block.degree)

    io.write_iga_data(filename, block.knots, block.degree, cps,
                      block.weights.ravel(), cs, conn, bcps, bweights, bconn,
                      regions)

    if options.plot:
        pn.plt.rcParams['lines.linewidth'] = 2

        ax = pn.plot_parametric_mesh(None, block.knots)
        ax.set_title('parametric mesh')
        ax.axis('equal')

        points = block.points[..., :dim]
        ax = pn.plot_control_mesh(None, points, label=options.label)
        ax = pn.plot_iso_lines(ax, block)
        ax.set_title('control mesh and iso lines (blue)'
                     ' in Greville abscissae coordinates')
        ax.axis('equal')

        points = bcps
        ax = pn.plot_bezier_mesh(None,
                                 points,
                                 bconn,
                                 block.degree,
                                 label=options.label)
        ax = pn.plot_iso_lines(ax, block)
        ax.set_title('Bezier mesh and iso lines (blue)'
                     ' in Greville abscissae coordinates')
        ax.axis('equal')

        pn.plt.rcParams['lines.linewidth'] = 3

        line = block.extract(0, 0)
        if dim == 3:
            line = line.extract(0, 0)
        ax = pn.plot_nurbs_basis_1d(None,
                                    line,
                                    n_points=1000,
                                    legend=options.label)
        ax.set_xlabel('last parametric coordinate')
        ax.set_title('1D NURBS basis')

        ax = pn.plot_nurbs_basis_1d(None,
                                    line,
                                    n_points=1000,
                                    x_axis=dim - 1,
                                    legend=options.label)
        ax.set_xlabel('last physical coordinate')
        ax.set_title('1D NURBS basis')

        pn.plt.show()
Exemplo n.º 6
0
def gen_patch_block_domain(dims, shape, centre, degrees, continuity=None,
                           name='block', verbose=True):
    """
    Generate a single IGA patch block in 2D or 3D of given degrees and
    continuity using igakit.

    Parameters
    ----------
    dims : array of D floats
        Dimensions of the block.
    shape : array of D ints
        Numbers of unique knot values along each axis.
    centre : array of D floats
        Centre of the block.
    degrees : array of D floats
        NURBS degrees along each axis.
    continuity : array of D ints, optional
        NURBS continuity along each axis. If None, `degrees-1` is used.
    name : string
        Domain name.
    verbose : bool
        If True, report progress of the domain generation.

    Returns
    -------
    nurbs : NurbsPatch instance
        The NURBS data. The igakit NURBS object is stored as `nurbs` attribute.
    bmesh : Struct instance
        The Bezier mesh data.
    regions : dict
        The patch surface regions.
    """
    import igakit.cad as cad

    dims = nm.asarray(dims, dtype=nm.float64)
    shape = nm.asarray(shape, dtype=nm.int32)
    centre = nm.asarray(centre, dtype=nm.float64)
    degrees = nm.asarray(degrees, dtype=nm.int32)

    if continuity is None:
        continuity = degrees - 1

    else:
        continuity = nm.asarray(continuity, dtype=nm.int32)

    dim = len(shape)

    output('generating NURBS...', verbose=verbose)

    dd = centre - 0.5 * dims
    block = cad.grid(shape - 1, degree=degrees, continuity=continuity)

    for ia in xrange(dim):
        block.scale(dims[ia], ia)

    for ia in xrange(dim):
        block.translate(dd[ia], ia)

    # Force uniform control points. This prevents coarser resolution inside the
    # block.
    shape = nm.asarray(block.points.shape[:-1])
    n_nod = nm.prod(shape)
    x0 = centre - 0.5 * dims
    dd = dims / (shape - 1)

    ngrid = nm.mgrid[[slice(ii) for ii in shape]]
    ngrid.shape = (dim, n_nod)

    coors = x0 + ngrid.T * dd
    coors.shape = shape.tolist() + [dim]

    block.array[..., :dim] = coors

    output('...done', verbose=verbose)

    # Compute Bezier extraction data.
    output('computing Bezier mesh...', verbose=verbose)
    cs = iga.compute_bezier_extraction(block.knots, block.degree)
    n_els = [len(ii) for ii in cs]
    conn, bconn = iga.create_connectivity(n_els, block.knots, block.degree)

    ccs = iga.combine_bezier_extraction(cs)

    cps = block.points[..., :dim].copy()
    cps = cps.reshape((-1, dim))
    bcps, bweights = iga.compute_bezier_control(cps, block.weights.ravel(), ccs,
                                                conn, bconn)

    nurbs = NurbsPatch(block.knots, degrees, cps, block.weights.ravel(), cs,
                       conn)
    nurbs.nurbs = block
    bmesh = Struct(name='bmesh', cps=bcps, weights=bweights, conn=bconn)
    output('...done', verbose=verbose)

    output('defining regions...', verbose=verbose)
    regions = iga.get_patch_box_regions(n_els, block.degree)
    output('...done', verbose=verbose)

    return nurbs, bmesh, regions
Exemplo n.º 7
0
def main():
    parser = OptionParser(usage=usage, version='%prog')
    parser.add_option('-o', '', metavar='filename',
                      action='store', dest='filename',
                      default=None, help=helps['filename'])
    parser.add_option('-d', '--dims', metavar='dims',
                      action='store', dest='dims',
                      default='[1.0, 1.0, 1.0]', help=helps['dims'])
    parser.add_option('-c', '--centre', metavar='centre',
                      action='store', dest='centre',
                      default='[0.0, 0.0, 0.0]', help=helps['centre'])
    parser.add_option('-s', '--shape', metavar='shape',
                      action='store', dest='shape',
                      default='[5, 5, 5]', help=helps['shape'])
    parser.add_option('', '--degrees', metavar='degrees',
                      action='store', dest='degrees',
                      default='[2, 2, 2]', help=helps['degrees'])
    parser.add_option('', '--continuity', metavar='continuity',
                      action='store', dest='continuity',
                      default=None, help=helps['continuity'])
    parser.add_option('-2', '--2d',
                      action='store_true', dest='is_2d',
                      default=False, help=helps['2d'])
    parser.add_option('-p', '--plot',
                      action='store_true', dest='plot',
                      default=False, help=helps['plot'])
    parser.add_option('-l', '--label',
                      action='store_true', dest='label',
                      default=False, help=helps['label'])
    (options, args) = parser.parse_args()

    dim = 2 if options.is_2d else 3

    filename = options.filename
    if filename is None:
        filename = 'block%dd.iga' % dim

    dims = nm.array(eval(options.dims), dtype=nm.float64)[:dim]
    centre = nm.array(eval(options.centre), dtype=nm.float64)[:dim]
    shape = nm.array(eval(options.shape), dtype=nm.int32)[:dim]
    degrees = nm.array(eval(options.degrees), dtype=nm.int32)[:dim]

    if options.continuity is None:
        continuity = degrees - 1

    else:
        continuity = nm.array(eval(options.continuity), dtype=nm.int32)[:dim]

    output('dimensions:', dims)
    output('centre:    ', centre)
    output('shape:     ', shape)
    output('degrees:   ', degrees)
    output('continuity:', continuity)
    output('->        :', filename)

    dd = centre - 0.5 * dims
    block = cad.grid(shape - 1, degree=degrees, continuity=continuity)

    for ia in xrange(dim):
        block.scale(dims[ia], ia)

    for ia in xrange(dim):
        block.translate(dd[ia], ia)

    # Force uniform control points. This prevents coarser resolution inside the
    # block.
    shape = nm.asarray(block.points.shape[:-1])
    n_nod = nm.prod(shape)
    x0 = centre - 0.5 * dims
    dd = dims / (shape - 1)

    ngrid = nm.mgrid[[slice(ii) for ii in shape]]
    ngrid.shape = (dim, n_nod)

    coors = x0 + ngrid.T * dd
    coors.shape = shape.tolist() + [dim]

    block.array[..., :dim] = coors

    # Compute Bezier extraction data.
    cs = iga.compute_bezier_extraction(block.knots, block.degree)
    n_els = [len(ii) for ii in cs]
    conn, bconn = iga.create_connectivity(n_els, block.knots, block.degree)

    ccs = iga.combine_bezier_extraction(cs)

    cps = block.points[..., :dim].copy()
    cps = cps.reshape((-1, dim))
    bcps, bweights = iga.compute_bezier_control(cps, block.weights.ravel(), ccs,
                                                conn, bconn)

    regions = iga.get_patch_box_regions(n_els, block.degree)

    io.write_iga_data(filename, block.knots, block.degree, cps,
                      block.weights.ravel(), cs, conn, bcps, bweights, bconn,
                      regions)

    if options.plot:
        pn.plt.rcParams['lines.linewidth'] = 2

        ax = pn.plot_parametric_mesh(None, block.knots)
        ax.set_title('parametric mesh')
        ax.axis('equal')

        points = block.points[..., :dim]
        ax = pn.plot_control_mesh(None, points, label=options.label)
        ax = pn.plot_iso_lines(ax, block)
        ax.set_title('control mesh and iso lines (blue)'
                     ' in Greville abscissae coordinates')
        ax.axis('equal')

        points = bcps
        ax = pn.plot_bezier_mesh(None, points, bconn, block.degree,
                                 label=options.label)
        ax = pn.plot_iso_lines(ax, block)
        ax.set_title('Bezier mesh and iso lines (blue)'
                     ' in Greville abscissae coordinates')
        ax.axis('equal')

        pn.plt.rcParams['lines.linewidth'] = 3

        line = block.extract(0, 0)
        if dim == 3:
            line = line.extract(0, 0)
        ax = pn.plot_nurbs_basis_1d(None, line, n_points=1000,
                                    legend=options.label)
        ax.set_xlabel('last parametric coordinate')
        ax.set_title('1D NURBS basis')

        ax = pn.plot_nurbs_basis_1d(None, line, n_points=1000, x_axis=dim-1,
                                    legend=options.label)
        ax.set_xlabel('last physical coordinate')
        ax.set_title('1D NURBS basis')

        pn.plt.show()