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abdelhamid belaid
Joined: 13 Aug 2009
Posts: 5
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jotero
Joined: 27 Jan 2007
Posts: 99
Location: Germany Hannover
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 Posted: Mon Aug 17, 2009 5:24 am Post subject: |
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hello all 
hi abdelhamid,
very interesting work from you! You are welcome
ciao
torolf
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my gallery |
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nextstep
Site Admin
Joined: 06 Jan 2007
Posts: 183
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| Posted: Wed Aug 19, 2009 8:14 pm Post subject: |
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Hi all;
Welcome Abdelhamid and keep up the good work 
Sorry for my late response.
I was also impressed by the work of Abdelhamid he sent me by email and asked him to subscribe in the forum to share it with others.
You can use the language of your choice Abdelhamid and I'll try to translate if you choose the Arabic
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Cheers,
Taha |
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inode
Joined: 27 Jan 2007
Posts: 72
Location: Austria
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| Posted: Thu Oct 22, 2009 11:43 am Post subject: |
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Hi abdelhamid
As I see your surface collection is growing and growing...
Really nice work!
The 2 helix surfaces are some basics.
Please can you publish the formulars of this Helix and the Double Helix. |
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abdelhamid belaid
Joined: 13 Aug 2009
Posts: 5
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| Posted: Thu Oct 22, 2009 6:29 pm Post subject: Thanks inode |
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hi all , hi my friend inode
the Helix :
F(x,y,z)= (sqrt( (x*cos(2*z)+y*sin(2*z))^2+(y*cos(2*z)-x*sin(2*z))^2 )-3)^2 + (atan2((y*cos(2*z)-x*sin(2*z)),(x*cos(2*z)+y*sin(2*z)) )/2 )^2 - 1
x:[-4,4] and y:[-4,4] and z:[-6,6]
the Double Helix :
F(x,y,z)=(sqrt((x*cos(z)+y*sin(z))^2+(y*cos(z)-x*sin(z))^2) - 3)^2+ ( atan((y*cos(z)-x*sin(z))/(x*cos(z)+y*sin(z))) )^2 -1
x:[-4,4] and y:[-4,4] and z:[-6,6]
Generally
u = x * cos (n * z) + y * sin (n * z) and v = y * cos (n * z)-x * sin (n * z)
and
(sqrt (u ^ 2 + v ^ 2)-a) ^ 2 + (atan2 (v, u)/n) ^ 2-R ^ 2 = 0
a, n : real numbers
More generally Writing :
f( sqrt (u ^ 2 + v ^ 2)-a , atan2(v,u)/n )=0
For example :
abs( sqrt(u^2+v^2)-a )+abs( atan2(v,u)/n )-b=0 or
( (sqrt(u^2+v^2)-a)/b )^100+( atan2(v,u)/(n*b) )^100-1=0 .....Etc
Last edited by abdelhamid belaid on Sat Nov 07, 2009 11:18 am; edited 4 times in total |
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abdelhamid belaid
Joined: 13 Aug 2009
Posts: 5
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| Posted: Thu Oct 22, 2009 7:11 pm Post subject: Please help me |
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Hi all , hello my dear friends
Frankly I want to say that I am not in the country appropriate for me  , I'm waiting for assistance Is there someone explain to me? I ran into problems here at the university and my delayed three years because of envy and administrative corruption, always be first in the study and this country does not respect the science and intelligent and successful, I want to complete my education in a country that respects science and I want to become a great scientist,
I ask for your understanding and Sorry for my english , thank you all |
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