[G+smo]边界和角点

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These definitions are used by, e.g., boxSide, boxCorner, etc.

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The sides are numbered as follows:

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2D CASE
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3D CASE

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Edge 1, {(u,v) : u = 0} :
c west
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Face 1, {(u,v,w) : u = 0}:
c west

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Edge 2, {(u,v) : u = 1} :
c east
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Face 2, {(u,v,w) : u = 1}:
c east

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Edge 3, {(u,v) : v = 0} :
c south
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Face 3, {(u,v,w) : v = 0}:
c south

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Edge 4, {(u,v) : v = 1} :
c north
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Face 4, {(u,v,w) : v = 1}:
c north

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Face 5, {(u,v,w) : w = 0}:
c front

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Face 6, {(u,v,w) : w = 1}:
c back

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c none is a special compatibility value used to denote that this is not a boundary.

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The corners are numbered as follows:

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2D CASE
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3D CASE

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Corner 1, {(u,v) : u = 0, v = 0} :
c southwest
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Corner 1, {(u,v,w) : u = 0, v = 0, w = 0}:
c southwestfront

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Corner 2, {(u,v) : u = 1, v = 0} :
c southeast
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Corner 2, {(u,v,w) : u = 1, v = 0, w = 0}:
c southeastfront

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Corner 3, {(u,v) : u = 0, v = 1} :
c northwest
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Corner 3, {(u,v,w) : u = 0, v = 1, w = 0}:
c northwestfront

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Corner 4, {(u,v) : u = 1, v = 1} :
c northeast
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Corner 4, {(u,v,w) : u = 1, v = 1, w = 0}:
c northeastfront

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Corner 5, {(u,v,w) : u = 0, v = 0, w = 1}:
c southwestback

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Corner 6, {(u,v,w) : u = 1, v = 0, w = 1}:
c southeastback

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Corner 7, {(u,v,w) : u = 0, v = 1, w = 1}:
c northwestback

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Corner 8, {(u,v,w) : u = 1, v = 1, w = 1}:
c northeastback