nsr/geometry/rep_3d/dmtet_utils.py

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import torch


def get_center_boundary_index(verts):
    length_ = torch.sum(verts ** 2, dim=-1)
    center_idx = torch.argmin(length_)
    boundary_neg = verts == verts.max()
    boundary_pos = verts == verts.min()
    boundary = torch.bitwise_or(boundary_pos, boundary_neg)
    boundary = torch.sum(boundary.float(), dim=-1)
    boundary_idx = torch.nonzero(boundary)
    return center_idx, boundary_idx.squeeze(dim=-1)