#
#   Copyright 2013 Pixar
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#   Licensed under the Apache License, Version 2.0 (the "Apache License")
#   with the following modification; you may not use this file except in
#   compliance with the Apache License and the following modification to it:
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#      names, trademarks, service marks, or product names of the Licensor
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#      the License and to reproduce the content of the NOTICE file.
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#   You may obtain a copy of the Apache License at
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#       http://www.apache.org/licenses/LICENSE-2.0
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class TopoError(Exception):
    def __init__(self, message):
        Exception.__init__(self, message)

class OsdTypeError(Exception):
    def __init__(self, message):
        Exception.__init__(self, message)

# From hbr/mesh.h
class BoundaryMode:
    "Subdivision boundary rules for :class:`osd.Topology` construction."

    NONE = 0
    "Boundary edges are corner verts are not processed specially."

    EDGE_ONLY = 1
    "Boundary edges are marked infinitely sharp."

    EDGE_AND_CORNER = 2
    '''Boundary edges are marked infinitely sharp, and vertices with
    valence=2 are marked infinitely sharp.'''

    ALWAYS_SHARP = 3
    "Unused."

class Sharpness:
    '''Provides some floating-point constants that clients can
    optionally use to set sharpness.'''

    SMOOTH = 0
    "As smooth as possible."

    SHARP = 1
    "Moderately sharp."

    INFINITELY_SHARP = 2
    "As sharp as possible."