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                                             331
SECTION 4.6                                                                 Patterns



Gouraud-Shaded Triangle Meshes)” on page 314 for further details on the format
of the data.

              TABLE 4.36 Data values in a tensor-product patch mesh
EDGE FLAG      NEXT SET OF DATA VALUES

f=0            x00 y00 x01 y01 x02 y02 x03 y03 x13 y13 x23 y23 x33 y33 x32 y32
               x31 y31 x30 y30 x20 y20 x10 y10 x11 y11 x12 y12 x22 y22 x21 y21
               c00 c03 c33 c30
               New patch; no implicit values

f=1            x13 y13 x23 y23 x33 y33 x32 y32 x31 y31 x30 y30
               x20 y20 x10 y10 x11 y11 x12 y12 x22 y22 x21 y21
               c33 c30
               Implicit values:
               (x00 , y00 ) = (x03 , y03 ) previous    c00 = c03 previous
               (x01 , y01 ) = (x13 , y13 ) previous    c03 = c33 previous
               (x02 , y02 ) = (x23 , y23 ) previous
               (x03 , y03 ) = (x33 , y33 ) previous

f=2            x13 y13 x23 y23 x33 y33 x32 y32 x31 y31 x30 y30
               x20 y20 x10 y10 x11 y11 x12 y12 x22 y22 x21 y21
               c33 c30
               Implicit values:
               (x00 , y00 ) = (x33 , y33 ) previous    c00 = c33 previous
               (x01 , y01 ) = (x32 , y32 ) previous    c03 = c30 previous
               (x02 , y02 ) = (x31 , y31 ) previous
               (x03 , y03 ) = (x30 , y30 ) previous

f=3            x13 y13 x23 y23 x33 y33 x32 y32 x31 y31 x30 y30
               x20 y20 x10 y10 x11 y11 x12 y12 x22 y22 x21 y21
               c33 c30
               Implicit values:
               (x00 , y00 ) = (x30 , y30 ) previous    c00 = c30 previous
               (x01 , y01 ) = (x20 , y20 ) previous    c03 = c00 previous
               (x02 , y02 ) = (x10 , y10 ) previous
               (x03 , y03 ) = (x00 , y00 ) previous

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