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COONS function and boundary edges visibility

Anonymous
Not applicable
Hi&Hello.

I was playing with COONS function to achieve patch that has invisible boundary edges.

Masking parameter that controls visibility looks like this:
mask = 4*j3 + 8*j4 + 16*j5 + 32*j6 + 64*j7   
where jn = 1 or0

When turning off each edge (j) it works fine but suprisingly when all "j" = 0 patch is still showing all 4 boundary edges (see attached fig.)
Have Anyone idea why?
Thanks
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