Comments by thisisjinesh

thisisjinesh 8-Apr-22 2:30am View

Thanks a lot

thisisjinesh 7-Apr-22 15:18pm View

Not able to add image anywhere. Option is not available.
the equation in book is
Q(u, w) = P(u, 0)(1 — w) + P(u, 1)w + P(0,w)(1 — u) + P(1, w)u
— P(O, 0)(1 — u)(1 — w) — P(O, 1)(1 — u)w
— P(1, 0)u(1 — w) — P(1, 1)uw

in above equation I tried two things.
For first part of equation I used P0u, P0w, P1u and P1w as it is and also tried Q1, Q2, Q3, Q4 which are my bezier curve but both way only plain surface at some angle is getting created.

thisisjinesh 7-Apr-22 15:09pm View

I tried but result is not coming as expected one. I will attach pages of book for your reference by editing question itself as I will not be able to attach pages in comment section.

thisisjinesh 7-Apr-22 14:48pm View

As you suggested, first I will refer rogers & Adams book and try it out and let you know whether getting proper result or not and I will share the same book pages.
Once again thanks a lot for your guidance and help.

thisisjinesh 7-Apr-22 12:21pm View

I also tried equations from books. It shows the basic concept of generating 2 surfaces from 4 curves and then deducting correction surface. Books mention S = S1 + S2 -S3 where S is the final surface and S1, S2 are the surface generated from the Bezier curve and S3 is the correction surface to keep all 4 points on one plane. I tried this equation but it was not giving curved surface at all so I got confused further.

thisisjinesh 7-Apr-22 12:18pm View

Hi sir,
Thanks for your reply.
I have checked your suggestion but still it is not showing the expected results.
I have gone through your article.
Section 11 of your article "Gallery" is showing one surface named Canopy. That's how the expected result on the same curve.
But in my code of course something wrong there which I am not able to figure out still. the surface is getting generated far away from the original Bezier curve and not showing expected results.
In your article you have mentioned about bicubic coons patch, however, I was looking for bilinear coon's patch. I am sorry for inconvenience if I did not mention this earlier in the question.

thisisjinesh 7-Apr-22 4:55am View

The surface need to get created from the Bezier curve and the 4 points of the curve should still remain same which is not happing in the code which I have shared. There might be some mistake which I am not able to figure out.

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