I followed the instructions for joining the two (blue and white, red and white)
patches.  I made sure the coordinates for the forth column of the blue patch:

B14
B24
B34
B44

were the same as the coordinates for the first column of the red patch:

R11
R21
R31
R41

and then added:

#declare R12=B14+(B14-B13);
#declare R22=B24+(B24-B23);
#declare R32=B34+(B34-B33);
#declare R42=B44+(B44-B43);

as per the instruction to smooth out the seam, but when I tested a control point
and raised the seam, it appeared as a sharp edge rather than a smooth edge,
which is what it's not suppose to do.  Anyone know why this happened?

Thanks.

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